1980 model prop question

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   Hi All,

Had another great family day on Loch Lomond (Scotland) on my old 1980 ski Nautique today.
I'm a total newbie at wakeboarding at if I'm honest totally crap too lol but trying hard. 
I've got a 3 blade prop on the boat just now, stamped on it is:
FEDERAL SUPERCUP
13RH13
10 90

Is this the correct pitch etc for the boat? Noticed today at 31mph I'm showing 4000rpm. That's saying the gauges are reading correctly tho. 
Would a prop change the revs, mpg, or even the wake?

Thanks in advance
Graeme 

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gmars70970 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: November-06-2013 Location: Scotland Status: Offline Points: 235	Post Options Post Reply Quote gmars70970 Report Post Thanks(0) Quote Reply Topic: 1980 model prop question Posted: August-24-2014 at 6:52pm
	Hi All, Had another great family day on Loch Lomond (Scotland) on my old 1980 ski Nautique today. I'm a total newbie at wakeboarding at if I'm honest totally crap too lol but trying hard. I've got a 3 blade prop on the boat just now, stamped on it is: FEDERAL SUPERCUP 13RH13 10 90 Is this the correct pitch etc for the boat? Noticed today at 31mph I'm showing 4000rpm. That's saying the gauges are reading correctly tho. Would a prop change the revs, mpg, or even the wake? Thanks in advance Graeme

Orlando76 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: May-21-2013 Location: Mount Dora, FL Status: Offline Points: 3108	Post Options Post Reply Quote Orlando76 Report Post Thanks(0) Quote Reply Posted: August-24-2014 at 7:20pm
	I think your tach is off. 13x13 federal is the factory prop for your boat. Good props for old school technology. Changing props will change rpm's and performance but I would only recommend chasing to an Acme 540 13x12 if anything. Change in wake will be so super minimal (flatter).

Donald80SN Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-12-2009 Location: Denver, NC Status: Offline Points: 3887	Post Options Post Reply Quote Donald80SN Report Post Thanks(0) Quote Reply Posted: August-24-2014 at 8:15pm
	You need to check your speed with a hand held GPS. You can download one to a smart phone. I have one called Speedometer GPS. I have it on my Apple I-Phone.

CrazyCanuck Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: July-21-2013 Location: Vancouver B.C. Status: Offline Points: 254	Post Options Post Reply Quote CrazyCanuck Report Post Thanks(0) Quote Reply Posted: August-25-2014 at 12:45am
	I have a similar boat. 78 SN. I have an original 13 x 13 rh on mine. I get almost exactly 30 mph at 3000 rpm. I don't go over the 10 mph per 1000 rpm scale till over about 40 then it takes a few extra revs to go full speed. My prop is cupped, and was repaired so it may be a bit more efficient than original..
	https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRtW3vJrMHLdqBzndt9VX3oOpBuRopGlzKq9Ea7pAO7wnTuoD8E8g

gmars70970 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: November-06-2013 Location: Scotland Status: Offline Points: 235	Post Options Post Reply Quote gmars70970 Report Post Thanks(0) Quote Reply Posted: August-25-2014 at 6:53pm
	Cheers, I've now downloaded a speed app for my phone so I'll double check the speed the next time I'm out. I'll maybe get the prop checked out by somebody that knows what their looking at too, all 3 blades could be bent for all I'd know. Cheers again Graeme

gR@HaM Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: May-01-2012 Location: UK Status: Offline Points: 1265	Post Options Post Reply Quote gR@HaM Report Post Thanks(0) Quote Reply Posted: September-08-2014 at 6:58pm
	Graeme I went for a 540 with mine and am very pleased with the wake. They are not cheap but i would say best upgrade you can get
	'82 Ski Tique

gmars70970 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: November-06-2013 Location: Scotland Status: Offline Points: 235	Post Options Post Reply Quote gmars70970 Report Post Thanks(0) Quote Reply Posted: January-08-2015 at 4:46pm
	I'm back again....... Graham where did you get your prop from, did you have to import it? Is this the model that everyone else has went with Acme 540 (13 x 12 0.08 cup)R

phatsat67 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6147	Post Options Post Reply Quote phatsat67 Report Post Thanks(0) Quote Reply Posted: January-08-2015 at 5:53pm
	540 is your sweet spot. There are cheaper places than me but if you have issues importing it I ship DHL quite frequently.

gmars70970 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: November-06-2013 Location: Scotland Status: Offline Points: 235	Post Options Post Reply Quote gmars70970 Report Post Thanks(0) Quote Reply Posted: January-08-2015 at 6:09pm
	Thanks phatsat67 I'll be in touch if I cant find a UK supplier. I grudge paying the "import tax" on top of the prop costs.

gR@HaM Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: May-01-2012 Location: UK Status: Offline Points: 1265	Post Options Post Reply Quote gR@HaM Report Post Thanks(0) Quote Reply Posted: January-08-2015 at 6:10pm
	Hello mate, hows tricks? I picked mine up from a guy on here that was having a clear out in his shop. The only other person I know of from the UK with a 540 is MattB, but he also had his imported from the US. I think it was from deep blue yacht supply.. http://m.deepblueyachtsupply.com/propellers/acme-props-3blade/ModelNumber/ACME-540
	'82 Ski Tique

gmars70970 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: November-06-2013 Location: Scotland Status: Offline Points: 235	Post Options Post Reply Quote gmars70970 Report Post Thanks(0) Quote Reply Posted: January-08-2015 at 6:19pm
	Everything's good mate. Hows the boat coming along? Importing looks like its going to be my only option. Unless I can find a shop who'll charge me £30 for the prop & £300 for shipping then i'll not need to pay the dreaded Import tax lol

1980 model prop question

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