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  What Prop for Water Skiing 90 E-Tec on 17

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Author Topic:   What Prop for Water Skiing 90 E-Tec on 17
dyeomans posted 04-29-2004 01:25 PM ET (US)   Profile for dyeomans   Send Email to dyeomans  
The Boat, 17 Montauk '90. Motor 90 E-Tec, Load three in boat one on skies, 18 to 20 gallons of fuel in Alum. tanks
under RPS. 96 qt ice chest. What pitch prop,etc.
knothead posted 04-29-2004 03:37 PM ET (US)     Profile for knothead  Send Email to knothead     

dyeomans

Don't know about the E-Tec 90, but my 2001 Johnson 90 easily pulls skiers and a full Montauk with a 17" pitch prop.

Remember, the Johnson 90 has 105.4 cid which is more than the E-Tech 90. Therefore, in theory, the Johnson 90 should have a better torque curve for skiing.

I guess that you'll have to experiment, but a 17" pitch prop would be a place to start.

regards---knothead

ratherwhalering posted 04-30-2004 01:15 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
I think you could go with a 13.25 x 15 four blade aluminum (to keep costs down) and just watch your max RPMs. That engine has a 5500 max RPM rating, and you would easily hit that with the above propeller. I say four blade because it will provide good bite, and drop the RPMs by 50-100 RPMs. Your top speed will suffer, but you don't really need 42 MPH when pulling a skiier, you need torque and good bite.

For just running around and fishing with a medium to light load, I run a Stiletto 13.25 x 17 Stainless prop on the same engine (2004 E90DSLSRS), and I hit 5200 RPM at WOT with no problems, however I have a set back bracket, and have lifted the engine so that the cavitation plate is about 3-4" above the lowest transom point, so a straight install might see lower RPMs at WOT.

This is just a guess based on my own experience with that engine, and there are certainly others on the site who have more experience and a better understanding of propeller configurations.

Peter posted 04-30-2004 01:31 PM ET (US)     Profile for Peter  Send Email to Peter     
I agree with RW's suggestion of a 15P propeller for skiing based on the data that I have seen on RW's performance with a 17P propeller. I'm not sure a 4 blade propeller is necessary although it couldn't hurt.
ratherwhalering posted 04-30-2004 02:46 PM ET (US)     Profile for ratherwhalering  Send Email to ratherwhalering     
Yeah, Peter, I'm not certain a 4 blade would accomplish much either, but it might provide a little more bite, and will at least drop the WOT RPMs down a bit, possibly to the point of preventing over revving.

By the way, dyeomans, Bombardier sugguests their 13 7/8" x 17 pitch propeller for that motor.

Salmon Tub posted 04-30-2004 07:29 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
I think it depends on what kind of skiing. Single ski normally calls for about 25 mph, as I remember, and a quick shot to get the skier up, so you may want to go with a 15". I am not sure what speeds and type of shot you need for a wake board, but I think they need a little more speed, and if they are easier to get up, then go with a 17". The 15" will put less stress on the motor when pulling the skier up. It has been a long time since I have been skiing, and many things have changed so take this advise with a grain of salt. I would rather run the engine a bit faster than lug it since you will only put a few hours of real pulling on it on most days anyway.
dyeomans posted 05-03-2004 06:54 PM ET (US)     Profile for dyeomans  Send Email to dyeomans     
Thanks! Motor is in box, boat on lot. He has a Cooks ML65 plate in stock. It has a 5.5 set back. The propeller info was very timely, Thanks!!

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