Prop problems

[Carphunter]

I have recently purchased a 1981 Dynatrak by Ebbtide, with a 115 Johnson outboard (also a 1981). I have a 4-blade, 12.8" diameter, 17 pitch prop. I am only getting about 33 mph at top speed. I have been told by many local boat dealers that I should be making at least 45 at top speed. I was also told that a 3-blade, <br />13-1/4" diameter, 19 pitch prop, (stainless steel), was what I needed. I tried this prop and was only able to get about 25 mph at top speed. I believe the boat is extremely heavy. My tachometer is broken, so I am not sure how many rpm's that I am getting. The motor seems to be running great, and I can tell I am getting more rpm out of the 4-blade prop. <br /> Thanks in advance for any help!

 

[Carphunter]

Re: Prop problems

Darn............forgot to metion that the boat is 16-1/2 feet long and it is a model # 162 fish and ski, obviously fiberglas.<br /> Thank ya............Thank ya very much.

 

[Carphunter]

Re: Prop problems

I have reposted in the correct forum!