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Author Topic:   Prop for 13 and 35 johnson
BluCs posted 01-10-2002 04:07 PM ET (US)   Profile for BluCs   Send Email to BluCs  
Have a 13ft Sport, with a 35 hp Johnson. Current prop is aq 10 x 13. Is this the best prop if the application is kids and swimming, with the occasional innertube ride thrown in? I'd like to get the most speed I can out of the thing.
Bigshot posted 01-10-2002 04:12 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Yup! I tried a 10x15 and it was great with 1 person(boat was new too). Add a kid and it was was s-l-o-w outa the hole. Since the engine is older the 10x13 will be perfect.
Peter posted 01-10-2002 06:49 PM ET (US)     Profile for Peter  Send Email to Peter     
Gotta agree there. Used to turn a 10 x 13 stainless with a 35 Evinrude on a 13 Sport. It had good speed and could pull a 135 lb skiier up on a slalom ski with a spotter aboard if the skiier knew what he was doing. The 10 x 15 was too much wheel for everything but lightly loaded conditions.
Lil Whaler Lover posted 01-11-2002 07:52 AM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
What model year is the 35hp? Based on the prop size it has to be a 1976 or newer. After a few years of making them, OMC changed the gear ratio in the lower unit, so it is important to determine which gear ratio is in the motor in order to get the right size prop. Dave
Peter posted 01-12-2002 07:08 AM ET (US)     Profile for Peter  Send Email to Peter     
My 35 hp Evinrude was a 1977. You're right about the gear ratio change. Didn't the change occur when they changed to prop shaft power ratings and called the 35 a 30? With the current gear ratio of the Johnson 30, a 10 x 15 might be the equivalent prop that the 10 x 13 was before the ratio change.
Dr T posted 01-12-2002 10:10 PM ET (US)     Profile for Dr T  Send Email to Dr T     
I for one would recommend AGAINST using the OMC SS 10x13 prop (early 80's design) for an early 80's vintage 35. I ran one when I had the boat in Texas and was never happy. Up here in the Rockies, it is even worse. After a long process of elimination, I have concluded that 10x13 was right, but the design of this specific prop led to sub-optimal performance.

After some extensive comparing of notes with Bigshot, I would suspect that you would be better served with a 10x13 Quicksilver or Michigan Wheel aluminum.

I have had satifactory performance at HIGH altitudes (>5500 ft) with an 11x9 and 10.5x11 aluminum props (one OMC and one Quicksilver). I plan to try an aluminum 10x13 when the ice melts. I will post the results.

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