115 yamaha prop size

[steplift20]

i would like to know if anybody have a 115 yamaha 4 stroke ad what size prop you are using to get the best performance
any suggestions would be great thanks

[randlemanboater]

Heres a link to my answer.

http://www.wellcraftv20.com/communit...ad.php?t=16501

[Jetty Rocker]

I repowered at the end of the last season with a F-115 Yamaha and I ran a 3 blade 17 pitch alluminum (Yamaha) prop that gave me good results. I tried a 4 blade stainless 17 pitch (Solas) but the cup or something was different and the results were terrible. I purchased a 3 blade stainless Solas 17 pitch that I have not tried yet. With the 17p Yamaha Al prop my top end was 32mph turning 6000 rpm with 5 adults and a 160 qt cooler filled with provisions. I averaged 4 mpg which is a lot better than the 1.5-2mpg that I was getting from the 225 oceanpro. You want to run the 115 four stroke Yamaha on the high end of the rpm range and that motor is a 5000-6000rpm engine. hope this helped.

[Genie Aye]

Reading Jetty Rockers experiance and adding my experience--I would say a 13 3/8" by 15" stainless Yamaha SSW prop would allow you to get up on plan quickly and haold the plain with a load.

If you have a good prop shop or dealer they will let you try different props before you buy--as long as you do not hit anything for no charge.

Good luck--this is a never ending question we all have--can we improve our performance with a different prop.

[Jetty Rocker]

Here's an update to my last post. I ran the 17p Solas SS and I could only turn @5800 but I still ran 32mph. I changed to the 15p Solas ss and got my rpm's back to 6000 but I think I topped out @ 30mph. The way that I use my boat I prefer the higher rpms over the speed. I'm sticking with the 15p for my use. I did notice prop chatter at the low speeds that I didn't have with the aluminum.

[Destroyer]

Originally Posted by Jetty Rocker

Here's an update to my last post. I ran the 17p Solas SS and I could only turn @5800 but I still ran 32mph. I changed to the 15p Solas ss and got my rpm's back to 6000 but I think I topped out @ 30mph. The way that I use my boat I prefer the higher rpms over the speed. I'm sticking with the 15p for my use. I did notice prop chatter at the low speeds that I didn't have with the aluminum.

A general rule of thumb is that you always drop a notch when you switch from Aluminum to Stainless, due to the flex of the prop blades. So a 17P Alum is equal to a 15P stainless.

[spareparts]

chatter is normal when you go to a heavier prop