Originally Posted by Flavio
Thanks for all the comments. I'm a big boy and if I want to put 300hp on a 200hp rated boat it's my decision.
Unfortunately no one has answered my question what effect on rpm a smaller diameter prop would have. There must be some rule of thumb for this just as there is for going up or down in pitch?
I tested the boat again today and apart from some mild chine walking at maximum trim the boat feels absolutely safe at any speed.
BTW It is the 65 Suite model.
Your not a little overpowered you 50% overpowered which is enormous
I would be inclined to ask the manufacturer of the boat after explaining your experience to them why it's rated at 200. There may be a very good reason we all here haven't touched on, better to know before you do a tripple salco with half turn out the thing as mollers says.
If the boats handling the power easily I think the prop you've got must be crap
if you go down in diameter the (and I could be wrong here,but it's my experience) the slip will increase and you gain nothing.
I have a similar problem and have gone down the hydromotive 4 blader route. I'll post results when I have them.