Prop removal questions...
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Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=21800
Printed Date: April-25-2024 at 6:11pm
Topic: Prop removal questions...
Posted By: mdvalant
Subject: Prop removal questions...
Date Posted: May-23-2011 at 1:25pm
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Hey all,
Sorry I couldn't find the thread on this, I suck at searching so if you have the link let me know. I thought there was one started. Anyways...tried removing the stock OJ off our sport but it's on there pretty good, as I was afraid. Anyone have awesome methods for removing a stuck on prop? Little guy just doesn't wanna let go! ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Replies:
Posted By: kapla
Date Posted: May-23-2011 at 1:52pm
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You tried with a puller? or hammer it?
Mine was there pretty stauck also...wouldn´t budge using a home made C puller....had a mechanic to remove it... Follow my http://www.correctcraftfan.com/forum/forum_posts.asp?TID=21692&title=soup-againbent-prop - soup again thread ..there´s some advice on different pullers...  ------------- <a href="">1992 ski nautique |
Posted By: mdvalant
Date Posted: May-23-2011 at 1:55pm
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Thanks Kap...We have a puller but couldn't budge it.
I will check the thread, we have a puller with the 4 long bolts connect to a C looking thing that goes on the back side of prop, then one bold in the middle on the front side to tighten and pull the prop off. I'm sure it's talked about, but I'll check. Thanks again ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: kapla
Date Posted: May-23-2011 at 2:01pm
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might try heating the prop with a torch... ------------- <a href="">1992 ski nautique |
Posted By: Hollywood
Date Posted: May-23-2011 at 2:40pm
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Put the puller on and let it sit, it's not a NASCAR pit stop. ------------- |
Posted By: mdvalant
Date Posted: May-23-2011 at 2:45pm
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That will really work? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: skutsch
Date Posted: May-23-2011 at 6:38pm
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Mike, should have warned you about pulling the prop on the sport, we had a puller and two torches working for 30 minutes to get mine off. I figured that thing must have been on there for at least 10 years. Oh and yeah, that prop is hot... ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: mdvalant
Date Posted: May-23-2011 at 6:41pm
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In the back of my mind I knew it was gonna be an awful deal, but was hoping by some miracle it'd just pop off. Yea right.
thinking about taking the nut off and driving around the river till the forward gear doesn't get me anywhere. Just have a flatty follow me around. [/end sarcasm] I hate the prop that's on it now. Motor turns great with it, problem is you don't go anywhere! It's like it sits there and spins ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: C-Bass
Date Posted: May-23-2011 at 7:01pm
You may want to try reverse. ------------- Craig 67 SN 73 SN http://www.correctcraftfan.com/diaries/details.asp?ID=6103" rel="nofollow - 99 Sport 85SN |
mdvalant wrote:Posted By: skutsch
Date Posted: May-23-2011 at 11:32pm
If you do, please do down in pool13 and not 12. That will give you plenty of time for that flatty to catch you. You don't need to repeat the "Tx Damn Test" ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: skutsch
Date Posted: May-23-2011 at 11:32pm
If you do, please do it down in pool 13 and not 12. That will give you plenty of time for that flatty to catch you. You don't need to repeat the "Tx Damn Test" ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: lewy2001
Date Posted: May-23-2011 at 11:49pm
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Mike I had the same feeling with the original prop. It felt like it was using far too many rpms at speeds above 30mph. This was comparing it to my 89 with the 422. I decided to change the original prop (OJ 13X16 4 blade) with the 422. The results were disappointing in that the rpms only went down 100-150rpm at 40mph.
The original prop was also very tight on my boat it bent my g clamp style puller so I made a quick copy of Pete's puller and it came straight off. I think the larger hull does require more thrust to get it through the water. I was just not used to the extra rpms required. Remember the GT40 is good for 5200rpm. Overall I think the OJ is a reasonably good prop for these boats. Looking forward to you testing the 1442 on this hull. Get the speed and rpm figures at reference points with your current prop before changing. I regret not doing that myself. One of my winter projects is to back to back both props with full data.  ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: mdvalant
Date Posted: May-24-2011 at 11:04am
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Thanks Mark,
Your puller looks like the exact same thing I have been trying to use. Your right, the OJ is not an AWFUL prop for the boat by any means, but we use the boat mainly for show skiing. It'd be really nice to have that extra diameter that the 1442 offers. Can't wait to try it out. Dad is afraid I'm gonna wreck his boat trying to get the old prop off. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: TRBenj
Date Posted: May-24-2011 at 12:18pm
Mark, what is that number based on? I agree with HW. Tighten, wait, retighten. If youre in a rush, a single hammer blow to the back of the puller will usually do the trick. ------------- |
Posted By: mdvalant
Date Posted: May-24-2011 at 12:21pm
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Cool thanks Tim.
We were rushed the day we were trying to remove it, I'll admit that. I will put that puller on it and tighten it here and there and see if that will budge it. No rush really now. Although I don't think I'll be able to mess with it til after this weekend. Skiing all week and we have our first show Friday! ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: Hollywood
Date Posted: May-24-2011 at 12:23pm
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With the C-clamp style if it doesn't pop off after ther first 1/4 turn I'll take it off and rotate between blades. Only once did I have to use a little pursuasion. ------------- |
Posted By: dougs_boat
Date Posted: May-24-2011 at 12:49pm
| I was initially planning to design my own puller...Then I saw the above one(lewy2001), it quotes Pete's puller. Is there a link to Petes puller, I am not having any luck finding it. Pete's design would most certainly be better than mine |
Posted By: 8122pbrainard
Date Posted: May-24-2011 at 1:08pm
Doug, Here's one of the threads the puller came up in: http://www.correctcraftfan.com/forum/forum_posts.asp?TID=12341&KW=puller&PID=145339&title=build-your-own-prop-span-classhighlightpuller-span#145339 - Build your own prop puller towards the end of page one. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Keeganino
Date Posted: May-24-2011 at 6:11pm
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Eric has a sweet design that also doubles as a shaft coupler remover. He said if he could get 5 people to commit he would finish them up. ------------- "working on these old boats may not be cost effective but as it shows its what it brings into your life that matters" -Roger http://www.correctcraftfan.com/diaries/details.asp?ID=4897" rel="nofollow - 1973 Skier |
Posted By: storm34
Date Posted: May-24-2011 at 9:54pm
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...sign me up. I just picked up a puller but will always buy whatever eric is selling. ------------- |
Posted By: lewy2001
Date Posted: May-25-2011 at 4:48am
Tim you are right it is 5000 max recommended rpm just checked the GT40 manual. I think I picked that number up from a couple of other threads on GT40 engines. I have seen 5200rpm on my tach starting to think I need to check the calibration. Don't think the engine is rev limited electronically so you could go past 5000rpm for short intervals. I had to check the manuals I bet you knew the max rpm figure off the top of your head.
------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: eric lavine
Date Posted: May-25-2011 at 9:47am
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i keep using the steel plates for other projects, and my machinist keeps bugging me to come in on Saturdays to finish them up. i will eventually build them...lost a bit of fire over the years..... ------------- "the things you own will start to own you" |
Posted By: TRBenj
Date Posted: May-25-2011 at 3:12pm
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Eric, theres a guy selling a similar version on ebay for ~$70... but since yours could be used to push a coupler off the shaft, Im in for $100 if you can get other interest. Hopefully the back plate is thinner than 3/8"? ------------- |
Posted By: mdvalant
Date Posted: June-10-2011 at 5:41pm
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GOOD NEWS!!! Dad just texted me (he's off today)
"got the prop off, heated the crap out of it and invited Joe and Moe" While blowing kisses to his arms he likes to say "once you meet Joe, you don't want no Moe" Goofy guy yea? Heat was the answer I guess!  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: skutsch
Date Posted: June-10-2011 at 7:36pm
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When do we get performance testing? I assume you put the 1422 on... Looking forward to seeing the numbers! ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: mdvalant
Date Posted: June-10-2011 at 7:39pm
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Steve, ACME 1442 on 2000 Sport Nautique GT40 Perf testing will begin promptly tomorrow morning at roughly 9AM CST.
I will report back on my findings. From what I understand there aren't many 1442's on Sport Nautiques. Should be fun to see the numbers and feel it! (feel the power and the prop) Can't wait to see how smooth it'll run, hoping it's better than the stock job. We have a tiiiny bit of mirror wiggle with the stock prop. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: skutsch
Date Posted: June-10-2011 at 8:40pm
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I am anxious to hear how it goes. The 422 that came with my boat (that I bunged up on the trailer) was a hot prop, I was seeing upper 40's with RPM's around 4800. The "spare" 422 I purchased is a real dog, I am doing really good to get 4400 RPM's and 43 or 44 mph, 41 with 2 or more footers in tow. Can't believe their is that much difference between the two. I am anxious to put the repaired "original" (to me) 422 back on their.
So if the 1422 makes your Sport more "lively" I may switch out my spare 422 for a new 1422. I also am anxious to see the actual prop to hull clearance, I figure it is going to be close. I think I may end up in Dubuque next weekend, so if you guys are around I may have to drop down. ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: mdvalant
Date Posted: June-10-2011 at 8:47pm
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Awesome Steve. By the way, we have the 1442, NOT 1422 (if that's even a prop ACME makes)
Dad said we have 1.25" between the blade and glass which is plenty of room IMO. We also have a 654 I may try if I hate this 1442 (I didn't like the 1442 on the 90) reason being I think is because the 90 didn't have enough power to turn it. I don't know. I have my bachelor party on the 18th but we will be skiing Sunday the 19th for sure. The bach party will be around town so if you're in the area whatever time works come on down. Sunday would be our best bet though! I'd love to post on tach numbers but after our new gauge install our tach has been flakey....we need to have our Marina check it out again. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: skutsch
Date Posted: June-10-2011 at 8:58pm
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Yes, 1442, that is what I meant, sometimes the fingers just don't listen to the brain...
Bachelor party huh? sounds like fun, but usually that ends up with me in no shape for driving. Anyway, if things go as planned we probably won't get back until later Saturday afternoon (post kids soccer games...). So Sunday is more likely. Hope to see you! ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: mdvalant
Date Posted: June-10-2011 at 9:05pm
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Did I mention that It's my bachelor party? Haha let's plan on sunday! ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: mdvalant
Date Posted: June-13-2011 at 12:08pm
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The report is in! Like I said earlier I can't really comment on our tach numbers because are tach is not trustworthy. So, feel and top speed are all I have.
First: WOW!!! Cannot believe how much smoother it is throughout. from 0-45 no vibration, smooth clean power. Also, unlike with the 90, this boat has the power to turn the prop when slamming the throttle pulling a large number of skiers. Top speed on the GPS was 45 with myself and Dad in the boat, which is average. Around 25-30 is where I notice the big difference. Motor isn't rapping out and still has a lot of room on the tach to go faster. Feels great! I want to test out our 654 but will be reluctant to take this one off... ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: echobravoecho
Date Posted: June-20-2011 at 1:11pm
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For what it's worth, I just used an Auto Zone tool loaner propram pulley puller to remove my stock prop from a 93 SN. 50 buck deposit, zero cost to me after I returned it. It was a tight fit, but it worked.
It took longer to jostle the puller and prop to a location where all the bits would clear the rudder. After that I put the screws to it and the prop broke free with a big bang after about 2 minutes and and 3 turns of the screw. I was left with three pieces: the prop itself, the "key" and a little wedge. Where does the little wedge go, and what is it's purpose? Thanks, Ed |
Posted By: mdvalant
Date Posted: June-20-2011 at 1:12pm
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Interesting Ed I have no idea what this little wedge you speak of could be...maybe others will know. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: 8122pbrainard
Date Posted: June-20-2011 at 1:41pm
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Ed,
Post a picture of this "wedge". I don't know what it is ether. Is it a brocken piece of the key? Some were tapered on the front ends. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: seacamper
Date Posted: June-20-2011 at 5:36pm
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Thanks for the topic guys, it was timely. I bought this as a backup prop:
http://cgi.ebay.com/ebaymotors/Inboard-Ski-Boat-Prop-Propeller-Nautique-Supra-14x16-1-_W0QQcmdZViewItemQQhashZitem2c5bd51897QQitemZ190519253143QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear#ht_500wt_975 - Prop And then promptly needed it. I squirted the old prop down with pb blaster, and I mixed a little Hollywood advice and put the pressure on and left it over night. The next morning I just touched it with a torch and it popped right off.  So now do I send the old stock prop off to get re manufactured? Is it worth it?
Tom ------------- 1980 Ski Nautique Boat Bar 1988 Mastercraft Tristar Open Bow 1988 Mastercraft Tristar Closed Bow 1969 Seacamper Houseboat 1986 Harris Pontoon 2004 Seadoo GTX SC + Flydive Xboard 1999 Adventurecraft |
Posted By: echobravoecho
Date Posted: June-20-2011 at 5:54pm
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A new Acme 422 was delivered from Delta this morning. I'm still at work, but look forward to installing and testing it this week. I'll get a photo of the "wedge" and post. (it's the size of a fingernail)
This will replace the stock prop, which I drove onto the mud flats while seeking "smooth water" for my 9 yr. old. She was on the boom, and just got up on the trainer skis. |
Posted By: 8122pbrainard
Date Posted: June-20-2011 at 7:15pm
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Ed,
Don't forget http://www.correctcraftfan.com/forum/forum_posts.asp?TID=12866&KW=proper+prop&PID=145077&title=span-classhighlightproper-span-span-classhighlightprop-span-installation#145077 - proper prop installation I'd hate to see you loose that new 422! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: echobravoecho
Date Posted: June-21-2011 at 12:10am
Thanks for the link to the lapping Procedure. Took about 5 minutes. Take a look at the results:
While we are at it, here's a look at the 422. Notice the machine work on the back? Is this typical of a new prop? 
And finally, the mysterious "wedge". I hope this fell from the sky when I was pulling the prop and landed right next to the key, cause it's not going back on. When there are more parts left over than what came off, that's known among engineers as "adding lightness". 
PS: Those aren't my toes! The nine yr. old is so excited to get back on the water she came out to help and couldn't keep her toes out of the photo. Ed |
Posted By: gun-driver
Date Posted: June-21-2011 at 1:22am
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I'm not sure if it's the angle of the first photo, but it looks like your due for a new cut-less bushing.
And it looks like the shaft isn't aligned to well, it looks like its riding against the 7-8 o’clock part of the bushing. What do ya think Pete?? |
Posted By: Chopper
Date Posted: June-21-2011 at 3:09am
The back of my 470 looked just like that. I assumed that they were "balancing" adjustments rather that rough cast related. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1540&sort=&pagenum=2&yrstart=1996&yrend=2000 - 98 Ski |
Posted By: 8122pbrainard
Date Posted: June-21-2011 at 8:42am
Paul, I agree. Ed, You had better check it. Also, the shot of the "wedge" isn't the greatest. How about another picture? You've got me real curious!! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 81nautique
Date Posted: June-21-2011 at 9:10am
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DId you happen to use a wood handled hammer while removing the prop because that looks like a handle wedge. Check your hammer maybe it fell out.
------------- |
Posted By: 8122pbrainard
Date Posted: June-21-2011 at 9:31am
Alan, Thanks - now I see it!! I think you're correct. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: gun-driver
Date Posted: June-21-2011 at 9:36am
| Looking at the two flat spots on the hub in the same picture, I think Alan guessed it right. |
Posted By: 81nautique
Date Posted: June-21-2011 at 10:24am
Ha I missed that but by the size of that wedge I think it was a universal prop removal tool AKA a BFH. ------------- |
Posted By: 8122pbrainard
Date Posted: June-21-2011 at 10:35am
I guess that puller didn't work the greatest!! But, it was an Autozone loaner!!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Hollywood
Date Posted: June-21-2011 at 11:58am
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Hey now Pete, how do you know those flats weren't already there from a previous removal? Give the guy a break. ------------- |
Posted By: echobravoecho
Date Posted: June-21-2011 at 1:03pm
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The auto zone puller worked great, plus it fit my budget. The prop damage was from a PO hack job.
I bent the prop on what basically was the shakedown cruise, and the drivetrain was vibrating enough already that I thought the prop needed some work even before I hit the mud. In fact if I didn't have the girls in the boat I'd a pulled it out of the water and gone thru the drive train. It vibrated enough that I didn't open it up to check top speed. Being mechnical but not nautical, when I found the shim I wondered if that was the cause of the vibration, installed at some point in the past to patch a massive defect. After working with the new prop and the lapping process, it's obvious that no such hack job could be perpetrated on the drive train and it still rotate. But the dents on the prop did explain some of the vibration, and now knowing that the cutlass bearing needs to be replaced explains the rest of the vibration. The prop shaft itself might also be bent. Is there a link to bearing replacement? I'll also need some intell on how the prop shaft transits the hull, and what parts are needed to refurb it. Thanks in advance and I'm already looking forward to a smooth running boat. Ed |
Posted By: C-Bass
Date Posted: July-28-2011 at 1:08pm
Mike, Did you ever test the 654? We ended up getting the 99 Sport and it has the stock OJ on it, but also came with an Acme weekend saver kit with a 654 in the bag  .
From our test ride I felt like the stock OJ was slipping a lot out of the hole, I'm thinking the Acme would be better. ------------- Craig 67 SN 73 SN http://www.correctcraftfan.com/diaries/details.asp?ID=6103" rel="nofollow - 99 Sport 85SN |
Posted By: mdvalant
Date Posted: July-28-2011 at 1:10pm
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Hey Craig! Glad you got that boat, hope it works out well for you!
We have yet to try out the 654...We also have our hands on a 422 now. Not sure which would be the better ride on the sport, might try both before the summer's end. I really didn't like that stock OJ that came with it. Did not do it's job IMO! ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: C-Bass
Date Posted: July-28-2011 at 1:22pm
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Well I think I'm going to try the 654. I'll let you know how it goes.
I think the new boat will suit our needs great. The Sport w/ the PCM transmission sounds like crap compared the BBC with the velvet, so the 85' is definitely more fun to cruise around in.... We may keep both, I like the looking out at the detached and seeing this.  ------------- Craig 67 SN 73 SN http://www.correctcraftfan.com/diaries/details.asp?ID=6103" rel="nofollow - 99 Sport 85SN |
Posted By: mdvalant
Date Posted: July-28-2011 at 1:24pm
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That looks beautiful :) We had that going on till about the end of June.
Dad was thinking about keeping the '90 but for what we do...we'd just never use it. They wanted to pay some more down on the new boat. haha ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: lewy2001
Date Posted: May-12-2012 at 5:55am
Better late than never that was almost 12 months ago. Yesterday was such a pleasant late Autumn day. Far to good to be in the office doing paperwork for the Tax department. Conditions 26C(79F) No wind. 98 Sport GT40 full tank of fuel driver 88kg(195lbs) and 30kg(66lbs)dog in bow walk through. GPS PP Stargazer readings. ACME 422 12.5 X 15.5 OJ 13 X 16 Legend (Original) 2000rpm 14.5 mph 2000rpm 14.1 mph 3000rpm 29.1 mph 3000rpm 28.0 mph 4000rpm 37.5 mph 4000rpm 36.5 mph 4500rpm 40.3 mph 4500rpm 39.8 mph 4940rpm 42.0 mph 4970rpm 42.7 mph Added 400lb Fatsac in rear locker and rerun WOT tests 4960rpm 42.3 mph 4990rpm 43.1 mph The top speed is disappointing especially when others have top speeds over 45mph with less rpms on same hull. The engine feels strong but does have a few hours on it. The rpms achieved indicate that it is pulling well just not getting good speed numbers. I have seen 5200rpm on this engine previously but that was with a Acme 470 which only lasted one day on the boat as the rpms were 200-300 higher right through the range. The original tach in boat is quite accurate but the Stargazer one gives you 10rpm increments hard to read the analog that fine. The water was glass and this may have slowed boat. No chop or ripple to get some air under the hull. The reference section had some numbers for the Sport and SN for 95 and 96. Not sure if these numbers would have been GPS certified but 46.6mph for the Ski and 47.5mph for the Sport. I remember the first time I found those number I was surprised that the larger Sport hull was faster. In 98 the factory did some small changes to rear chine cutout plus reduced the shaft angle. I wonder if that slowed the boat down over the previous Sport 93-97? Mike or Steve did you ever get full GPS readings on your hull with either the Acme 1442 or 422. Especially interested in the numbers for the 1442 Mike. Pete or Tim do you think I would have enough hull clearance with the 1442 prop. The 12.5" 422 has 1.375". The 13.25" 1442 would have only 1" by my calcs.  ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: eric lavine
Date Posted: May-12-2012 at 8:23am
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on the big stuff and i dont know if its needed on the smaller props, but we sweated one on yesterday and i finally discovered what the meaning was to "sweat" a prop on. we got the prop as tight as it could go, and i mean tight, then we flash heated the prop for about 10 minutes, and got about another 3/4' turn on the nut. but as we flash heated the prop, you could see it actually sweat on the blades. I dont suggest heating your prop and i will do some looking on seating smaller props. I have noticed in the past though when taking props off that the nut at times is loose and thats because over time it advances more onto the shaft from the thrust of the boat and the nut loosens ------------- "the things you own will start to own you" |
Posted By: TRBenj
Date Posted: May-14-2012 at 11:40am
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Yes, you'd have room to run that 1442 (I believe Mike has tried it on his Sport as well). I probably wouldnt though, as it will turn ~200 more RPM than the 422, so very similar to the 470. Youre propped just right if your turning just under 5k. The big discrepancy between the speed and RPM would suggest that you have a slow hull. Where does the spray break when youre at skiing speeds (30+)? My '90 also has a slow hull... runs very nose planted:  Short of taking a grinder to the hull and removing some hook, theres not a lot you can do about that. ------------- |
Posted By: mdvalant
Date Posted: May-14-2012 at 6:17pm
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Hey sorry I must have UN-subscribed from this thread for some reason... I'll work on getting some numbers. I never have time for fiddle faddle I just kinda wing it and go by what feels good to me. Had the 422 on the sport yesterday after a full recondition from ACME and I didn't really like it all that much........ 654 still my favorite though by far. If my memory serves well none of our props were under the 44mph mark on GPS. They were all 44-45 with one driver and rider full tank of fuel. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: GlassSeeker
Date Posted: May-14-2012 at 7:21pm
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the grinding on the new acme is normal---balancing the prop ------------- This is the life |
Posted By: 8122pbrainard
Date Posted: May-14-2012 at 7:41pm
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Andy, I must have lost your idea here? 
Are you talking about Tim's comment?
------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: GlassSeeker
Date Posted: May-14-2012 at 7:46pm
No no , sorry Pete I shoulda used the quote feature  Ed had asked way back up the thread about his new acme having machining marks(grinding) ------------- This is the life |
Posted By: 8122pbrainard
Date Posted: May-14-2012 at 8:03pm
Andy, Got it! I even went back in the thread briefly looking to see if I could figure out your comment!  Thank's for clearing up my confusion.------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: lewy2001
Date Posted: May-14-2012 at 11:12pm
Mike what rpms were you seeing with the 422 at WOT?? My 422 is just back from the prop shop also so I wanted to get the numbers before I get a chance to hit some more debris. It is a better prop than the OJ 13 X 16 smoother and does reduce rpms at skiing and boarding speeds. The OJ is quite a good prop for this hull and does produce a slightly better top speed. It also handles small hits from debris better than the ACME. Both props have plenty of pull, the ACME is slightly better. We never use it to pull more than 3 people so never have the need for less pitch like your application. How many rpms are you seeing at 36mph with the 654? Tim maybe it is a slow hull. My thoughts were the 1442 being a 3 blade may have a higher top speed. If it has the same rpms as the 470 though it will not be that usable (5200rpm). Tim do the 470 and 1442 tend to run the same rpms versus speed? What do you think of the OJ 428? The speed numbers with 400lb ballast did not change very much(less 0.5mph). The attitude of the boat did not change much either, it still ran very flat. Almost zero bow rise when you go WOT. This was one thing I really noticed going from the 89 2001 to the 98 Sport almost no bow rise on take off. Have never paid much attention to where the water breaks on the hull but I will next time. Maybe I should have added 2X 400lb bags and see if that gets anymore of the hull out of the water. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: skutsch
Date Posted: May-15-2012 at 11:15am
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Hi guys, been busy with work, the kids and trying to finish my basement (at the dry wall stage) before warmer weather (I'm already too late) arrives. Anyway, I did manage to drag the boat home this weekend. First on the list is to take my two props out and collect some data. Unfortunately, that is probably not going to happen for a few weeks. Have to get the kids wrapped up with school and then the schedules ease a bit. Interesting discussion about the weight. The last few times, I had done speed runs and come up with slower speeds, I was running with myself and no extra weight. I was very disappointed because the speeds were very slow. I think I have seen my fastest speeds with the boat loaded with five guys and a lot of gear. I never thought about using ballast to overcome the hook in the hull. Very interesting... ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: TRBenj
Date Posted: May-15-2012 at 11:25am
The 3-blade vs. 4-blade argument is secondary to propping your WOT rpm's to your power curve. The 3-blade will have an advantage, all things being equal... but if it puts you 200rpm further from your hp peak, then things are NOT equal. I wish Acme would make a few 3-blades larger than the 470 and 1442 for the 1.23's, as the higher powered boats (HO 351w's, 6.0L's, etc) could benefit from one. Boats like the Crush and Joe's stroker only have 4-blades to choose from. I doubt youre going to do better than the 422, based on the RPM's youre seeing with it. Ive never tried the 428, but Id like to. Ive tried the 430 (428 with extra cup) and I really disliked it on both my '90 and the Crush. I believe the 428 should turn very similar RPM's as the 668 Acme (which is a 422 with extra cup), or maybe a touch less. Even the Crush couldnt turn the 430 (~5200rpm, vs. 5550-5600 with the 668). I doubt the 428 would be the hot speed prop though, as OJ's tend to make the boat run a little more bow-down. Might be a good choice for slalom.
Sounds like youre seeing all the tell tale signs of a slow hull. On my '90, I get zero bow rise. Adding weight to the rear seat helps very little. With 4 people across the back, I am lucky to pick up 1mph. The hull is just planted, and its a lot to overcome. Check and see where the spray breaks... if its at the windshield or further forward, thats your answer! ------------- |
Posted By: mdvalant
Date Posted: May-15-2012 at 11:33am
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ALL, I would love to be more help but unfortunately after the switch from digital to analog gauges our tach reads all over the place. Not sure why it flutters around...maybe you guys have ideas for that. I'll video it from 0-WOT and you can watch how the tach doesn't make sense at all. So, I am no help with those kind of numbers...yet ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: skutsch
Date Posted: May-15-2012 at 6:47pm
Tim, now looking at your photo compared to the only photo I could find of my SPORT running at or around 30 mph and WOW what a difference. It almost appears your spray breaks in front of the windshield, while I can't see exactly where (in relation to the windshield) it breaks on the SPORT, it is definitely aft of where it breaks on the 90 SKI. Also, there is probably some variation due to water conditions, but still the difference seem pretty big.  ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: TRBenj
Date Posted: May-15-2012 at 7:07pm
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Like you said, its really tough to tell based on the water conditions, but that looks pretty planted to me. The spray is easily breaking somewhere in the vicinity of the windshield, which is about where mine is most of the time (lightly loaded and without the boom). The picture of my boat above does look pretty extreme- its normally not quite that bad. At footing speeds:  Of course, its nothing like the Crush (gate up):  Pay attention next time youre in some calm water! ------------- |
Posted By: lewy2001
Date Posted: May-16-2012 at 12:01am
Just went through all my pictures and videos and they are all from inside the boat. Will make sure I get some of the boat at speed next season. Tim do you think a trade off from a slow hull maybe a better slalom wake? I agree my rpm numbers are good so the 422 is the right prop keeping it just under 5K. Would be nice to see 45mph though. Was hoping a 3 blade may help but with less pitch than the 422 that is not likely without seeing excessive rpm. Tim a three blade 12.5" prop with 15.5"-16" pitch would be a nice option if available. Looks like I have a excuse now for wimping out on the barefoot experience. Steve and Mike get some numbers and pictures of the boat at say 30mph 35mph and 40mph to match your prop testing numbers. This would provide some real nice reference material for all us Sport owners. Hey now that Keith has one you will be helping him out as well. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: skutsch
Date Posted: May-16-2012 at 1:38am
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Lewy, that is the plan as soon as I can get out, I will run the numbers. I have a couple of Sports at my disposal so I will see if I can get them all in the water and test all the props we have. Mike - Is the 1422 currently in the water? Any chance I could borrow it (for testing purposes only) if it is not currently deployed? ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: storm34
Date Posted: May-16-2012 at 1:52am
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My contribution....Thanks again Mr. Morfoot for the pic. Our windshield is back another 9" so I'm guessing it's worth at least another MPH or 2?  ------------- |
Posted By: GlassSeeker
Date Posted: May-16-2012 at 2:14am
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if your boat will pull 40mph you can barefoot...so no excuses. ------------- This is the life |
Posted By: TRBenj
Date Posted: May-16-2012 at 11:23am
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Agreed- 40mph is all you need to barefoot. 43+ with a footer is only needed if youre a BIG boy or doing 1-foot stuff. Chris, that picture is worthless (as far as judging running attitude) because of the water conditions. Cool pic though! Similarly, the Crush doesnt normally run *quite* this bow-high.  Mark, youre absolutely right- a 12.5x15.5 or 12.5x16 modern CNC 3-blade would be great to try, as it might give you close to another mph. Too bad no such prop exists! I would absolutely say that yes, the up side of having a "slow" hull is that because the nose is more planted, the slalom wake is improved. I think it helps the barefoot table a bit as well, as the turbulence behind my '90 is much more manageable than it was behind our former '92. ------------- |
Posted By: mdvalant
Date Posted: May-16-2012 at 12:16pm
Wow there is not much of that crush in the water, kinds looks like an inboard bass boat...sorta. Steve, Yes, you may borrow the 1442. Come down to Bellevue and we'll throw it on for ya! ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: TRBenj
Date Posted: May-16-2012 at 12:54pm
Its bouncing due to the water conditions and weight in the back. Just a well timed photo. It was to show that a single snapshot can be very misleading. ------------- |
Posted By: skutsch
Date Posted: May-16-2012 at 1:33pm
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I have seen 'Dyne's riding like the bass boat above. Mike, thanks for the info on the prop, What I would like to do is plan a day to come down and pick it up in the plane (and get you your airplane ride). Then I would run it up here on a couple of boats, collect data and then bring it back. Looks like I am going to have to get working on the schedule. Will that work? ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: mdvalant
Date Posted: May-16-2012 at 1:34pm
YES!!! Let me know what kind of dates you're looking for and I'll let you know what's going on. I know we're out of town...June 9th I think it is. But yea, let me know. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5009 - '90 Ski (sold) http://www.correctcraftfan.com/diaries/details.asp?ID=5479 - '00 Sport Mississippi River - Bellevue, IA |
Posted By: skutsch
Date Posted: July-11-2012 at 5:38pm
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Ok, I finally got a chance to gather some data on the ACME 422 prop and performance. Below are a couple of video's that detail the testing" No Ballast and with Ballast (2 FatSac Bricks 310 lbs) In table form, I also captured the following: Speed (GPS) RPM (No Ballast) RPM (Ballast) 15 mph 1800 RPM 2100 RPM 18 mph - - - 2300 RPM 32 mph 3100 RPM - - - 34 mph - - - 3300 RPM 44 mph 4550 RPM 4550 RPM ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: TRBenj
Date Posted: July-11-2012 at 5:45pm
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Where did you have the fatsacs? ------------- |
Posted By: skutsch
Date Posted: July-11-2012 at 5:52pm
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Dang, and I thought I captured all the details... Fat Sac's were ON the rear seat in the port and starboard corners. Also, it is difficult to tell but the spray is breaking at about the start of the windshield with NO BALLAST and about midway up the rise of the windshield with the Ballast. I also had 1/4 tank of fuel on the gas gauge. ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: TRBenj
Date Posted: July-11-2012 at 5:54pm
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Thats the right place for them (unless you can get them further back like in the trunk or on the platform). It doesnt sound like you sped up at all? Does your GPS only read in 1mph increments? ------------- |
Posted By: skutsch
Date Posted: July-11-2012 at 6:04pm
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Unfortunately I had it on the dial setting, should have switched to the numeric readout, my bad. It was a lot of stuff trying to manage driving and filming - HA! Also could have put fatsacs in the trunk, but it was full of gear. As I think about it, those two fat sacs really don't add all that much weight. I may have to come up with another more creative test. What are your thoughts on the RPM - I believe thats about right where I want them, so from the perspective of propping for WOT, I think I am right there. If I switch to a 1442, what should I expect to see happen with the WOT RPM's? ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: TRBenj
Date Posted: July-11-2012 at 6:18pm
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I think your tach is lying to you. A 422 will run closer to 1:1 on a lighter Ski Nautique at skiing speeds. It will still overturn by a good margin at WOT (by nearly 400rpm. ie, 46mph @ 5000 rpm). I dont buy that a larger/heavier Sport is only turning that prop 4450rpm at 44mph. Its probably closer to 4800-4900. You'd want to prop it to run 4800-5000 anyways. ------------- |
Posted By: lewy2001
Date Posted: July-11-2012 at 10:25pm
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Steve nice work on the prop testing. Your rpms do seem very low at WOT. Can you borrow a shop tach to verify readings? If these numbers are correct though you would be able to run the 1442 or the 470 as you have available extra rpm. Be interesting if they achieved better WOT speeds. In the older Sport brochure they did state the Sport was faster than the Ski at WOT. But these numbers were before the prop shaft angle change in 98. I wonder if this shaft angle change not only makes the 98 and above Sports run flatter but also slower. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: skutsch
Date Posted: July-12-2012 at 2:06am
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Ok, so next test will include some more jockeying of the ballast (putting it in the trunk), I will use the digital speedo instead of the dial, and I will hook up a temporary digital tach to verify operation. I probably will for go any additional video. I think the video taken so far demonstrates the water breaking point on the hull, and has established that I am reading the gauges correctly (HA!). IO got a get some time to fly down to DBQ, take Valant for his airplane ride and pick up his 1442 for testing... Dang work gets in the way! ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: skutsch
Date Posted: July-12-2012 at 2:10am
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Hmm upon further review, I can not read the gauges, the Tach was actually reading 4550. According to Tim, that still sounds low. More to verify. Also updated the speed info above. Video will remain incorrect... ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: lewy2001
Date Posted: February-11-2013 at 10:26am
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Tim how would a ACME 2068 perform compared to the 422? Would the extra cup (0.150) reduce WOT rpm's compared to the 470 with (0.105). Have you done any testing with this prop? The reason I ask is that I damaged my 422 yesterday it may be repairable but I was thinking of ordering a new prop. I would have ordered a 1442 previously but you mentioned it would turn higher rpms just like the 470.  ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: TRBenj
Date Posted: February-11-2013 at 12:14pm
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Lewy, bummer on the prop. The 2068 is the cupped 470 IIRC, and would make it turn pretty similar revs to the 422. Im not a fan of adding that much cup to the prop (prefer to keep it at .105 or below). I think adding that much cup just makes the prop less efficient. A few of us have added cup to props and while its effective at dialing in RPM to the desired level, it usually does not come along with increased speed as it should. More pitch is really the ticket for these situations. What were your RPM's with the 422? ------------- |
Posted By: kapla
Date Posted: February-12-2013 at 12:51am
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Details on how you chewed that prop! Boomer ------------- <a href="">1992 ski nautique |
Posted By: Gary S
Date Posted: February-12-2013 at 1:10am
 ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: lewy2001
Date Posted: February-12-2013 at 7:47am
We decided to go to a different dam that we had not been skiing on for a few years. It was a late decision on Sunday afternoon as the conditions were perfect and this dam is the closest but requires ideal conditions to get good water. It was down to about 80% capacity which we had no experience at either. I was actually skiing when the boat stopped, quickly realised what had happened when the water was just over knee deep as I dropped back into the water.
Tim, I was getting 4940 WOT on the 422. I had always wanted to try the 1442. I am leaning to ordering one and if it increases the RPM to much thinking of adding a bit of cup as it only has 0.090 standard. The 422 may be repairable so I do not want to end up with 2 of them. Although I think that the 422 may be the best prop for our application. A fresh untouched 422 may even been better than my 422 that I have massaged a few times . I did have it repaired last year by a very reputable company before doing my prop testing. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: TRBenj
Date Posted: February-12-2013 at 5:47pm
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I think thats a good approach! ------------- |
Posted By: lewy2001
Date Posted: March-24-2013 at 10:18am
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Finally tried a WOT run with the 1442 today. The prop has felt good since installed plenty of bite on hole shot and reasonable rpms at skiing speeds. With 5 people in the boat 36 mph is almost 4000rpm with skier behind boat. Top speed was 43.1 @ 5030rpm with 5 people and plenty of gear in the boat. Should have my repaired 422 back this week. Not sure if it will go straight back on now. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: PLBC
Date Posted: March-25-2013 at 1:27am
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Have any of the sport / air owners tried either of these props? 224 (13x15.5) 4 blade .090 cup or 668 (12.5x15.5) 4 blade .150 cup ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=5164&sort=&pagenum=1" rel="nofollow - 99 |
Posted By: TRBenj
Date Posted: March-25-2013 at 11:30pm
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Kurt, the 224 would be interesting to try as its pretty close in size to the proven 422. Skip the 668, it's the extra-cup version of he 422 (meant for 6.0l boats) and would be taller than ideal. ------------- |
Posted By: skutsch
Date Posted: March-26-2013 at 12:15am
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So, Kurt thanks for refreshing this in my mind, and I told you Tim would have some good stuff. So what about the 2068, .5" less pitch with 3 blades and 5/100ths more cup? Would that be a 3 blade that would be as identical as you can get to the 422? Being a 1/2 smaller in diameter then the 1442, I am thinking I might be able to turn it closer to the 5000 RPM Peak HP? Thoughts? ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: lewy2001
Date Posted: March-26-2013 at 3:24am
Steve go back at bottom of last page I asked Tim about the 2068.
Steve see above post about 1442 even though it is a larger diameter 13.25" compared to 12.5" I was able to turn it 5030rpm better than both the 422 and original OJ legend it also produced my best top speed and this was all in a boat with 5 people and gear with low fuel. Looking forward to back to back testing it against my yet again repaired 422. Kurt the 224 would be worth a try especially at reducing rpm at footing speeds. ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
Posted By: TRBenj
Date Posted: March-26-2013 at 12:20pm
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What Mark said ^^^. I turn the 1442 200rpm higher than the 422. To get the most out of a GT40 (lightly loaded), prop it to turn right around 5k. The 3-blades like the 470 and 1442 usually put you beyond that. The 422 usually comes in pretty close, but the 224 and 1490 (13.25x15.5, .060) would probably run pretty similar RPM's as well. Bigger props like the 668 and 1492 would bring the revs down even more, but probably keep you south of 4800 and be a little doggier all around, especially on a bigger boat like the Sport. ------------- |
Posted By: skutsch
Date Posted: March-26-2013 at 12:41pm
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Mark - of course you guys already talked about it!, I obviously need to pay more attention to this thread... So no issues on the clearance, increase of 3/4 inch of dia, only brings the tip 3/8 inch closer to the hull, so I guess not... Maybe I will give ACME a call and see if they can come to Green Lake and demo props - that might be a good idea. Then we could run, a 470, 422, 224, 1442 and at that point I would even try the 1458 ------------- Our http://www.correctcraftfan.com/diaries/details.asp?ID=4669" rel="nofollow - 98 Sport Nautique My Dad's 63 Ski N |
Posted By: C-Bass
Date Posted: March-26-2013 at 12:56pm
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I need to get GPS and RPM data for the 654 on our Sport. I think WOT is close to 5k, not sure on speed. I am very happy with it though. ------------- Craig 67 SN 73 SN http://www.correctcraftfan.com/diaries/details.asp?ID=6103" rel="nofollow - 99 Sport 85SN |
Posted By: 63 Skier
Date Posted: August-27-2013 at 8:54pm
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I've finally got numbers on my new 1442. First, strange thing happened with the stock OJ 13x16 4 blade. Until I dinged it, I was getting 44.5 mph at 4,600 rpm. I sent it out for recondition and put it back on first. I could tell from the first minute that something was different with it, had less bite at idle in gear. Here's the numbers I got with it after recon: OJ 13x16 4 blade rpm mph 2000 13.0 2500 22.2 3000 28.0 3500 32.3 4000 36.4 5230 44.7 WOT Crazy, huh? They must have really altered the prop when they reconditioned it. On to the 1442, here's the numbers today: Acme 1442 3 blade rpm mph 2000 13.1 2500 22.0 3000 28.2 3500 33.3 4000 37.6 5180 45.4 WOT The prop felt great, excellent holeshot. I hope to get behind it on the ski in the next few days. At 4800 rpm the speed was 43.6 mph. Even though the numbers for the 2 props seem similar, the Acme felt much better, more responsive. All numbers were with 1/4 tank of fuel, fair amount of gear in the trunk and ski in the locker, just me in the boat, light breeze. Now if I can stay away from rocks ...... ------------- '63 American Skier - '98 Sport Nautique |
Posted By: lewy2001
Date Posted: August-28-2013 at 12:30am
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David looks like they have changed your OJ somewhat maybe a touch less pitch. The OJ Legend is a decent prop just the ACME CNC's are that much better. Did you notice the harmonic noise when slowing down? You are still seeing better speed than my 98. I must have a slow hull with a bit more hook.  I have yet to test my repaired 422 against the 1442 back to back. Should be able to do that shortly as spring is almost here.  ------------- If you're going through hell, keep going http://www.correctcraftfan.com/diaries/details.asp?ID=2999" rel="nofollow - 89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |