Big Lake 28 Nov 2009

[Ray]

Originally Posted by Big Nasty

It rode like a cadillac compared to my old bay boat. Only thing is I will have to find a different prop. The four-blade is no good. It is slipping out the hole and doesn't grab on top end. I think I might go with a 13 3/4'' x 19'' 3 blade prop. What prop are you running ray on your 19 ft cobia? The front deck is just big enough to put two on the bow. The motor ran like a top. The hydraulic steering is sweet. Can't wait to solve the prop issue and really test drive it. Also, I need a few white caps to really see what she will do.

You need to see what the top RPM is. You should be able to reach manufacturers top RPM. If not, you need to change the prop to get there.
If you are slipping at take off, you can talk to a prop guy and get a little cup put on it instead of buying a new one.
I have a 14 X 19, 4 blade.

[Nasty]

I'm basing my prop selection on numerous bulletins found on the yamaha website for bay boats and the 150 hp. The heavy boats use a 17'' pitch, and lighter boats use a 19''-20'' pitch on boats similar to mine. Yes, I will consult a prop guy before buying a used prop. I can't use the one now because I think it is completely the wrong prop. The size of the hub doesn't match the motor. It has a smaller diameter. I had a 200 Yam on my old boat which is basically the same motor I have now. The prop is way to small-- my guess it may be for a smaller motor (115?) All I know it is gonna be taken off.