prop size

[*Crippler*]

I got a Key West 186 DC with a Yamaha 115 two stoke. It currently has 13x17p aluminum prop and runs 5500 rpm at WOT. I need better hole shot but I believe 5500 is the max rpm. Any suggestions on what size prop?

[CUduckreeper]

You could try a four blade prop.

[willyworm]

Another vote for 4 blade.

If max speed isn't top priority a 4 blade would get that hole shot problem fixed.

[Joe Krasko]

A prop with ventilation holes will also give you a better hole shot.

[*Crippler*]

Thanks for the help. With the four blade would I get the same pitch?

[Rubberhead*]

You could try a four blade prop.

My first thought too.

Thanks for the help. With the four blade would I get the same pitch?

Nope, go down 1" to start with - if you weren't hitting near max RPM I'd suggest 2" but you might over-rev going down 2".

[Civil-Cock]

Prop it to run WOT just under 5800 rpm light, you will pick up hole shot on most props tuning it this way. Yes it will be over Max rec RPM but that motor can take it. Try a general purpose Stainless prop like a Stiletto in 15" pitch. It got some cup and some rake, but not too much which would be a waste of your boat.

[*Crippler*]

Does that diameter seem small? would changing that help?

[willyworm]

Having a prop guy trim some off the blade to reduce the diameter will generally cause the rpm to go up.

[Rubberhead*]

Does that diameter seem small? would changing that help?

Pitch is way more important that diameter. But with equal pitch a smaller diameter prop is more likely to cavitate. You might have a better hole shot with a smaller diameter but you'll have to 'feel' your way through the throttle to make sure you don't draw a vacuum. Again, with pitch being the same, a large diameter will let you drop the hammer without worrying about cavitation.

Of course the other issue with diameter is clearance which shouldn't be a problem.

[*Crippler*]

gottcha thanks for everyones input.