Prop question

[Bonvie]

Hi guys..just bought a 1988 Searay Sundancer (26'8)..having trouble getting any speed out of it ..motor is revving/singing at about 4,000rpm to get to 22/23 mph..has a 7.4 litre 454 engine..that should be like a rocket..the previous owner had hand written in the owner's manuel that the prop for this boat is a 15 and 1/4 by 15 prop and that is what is on the boat...a buddy of mine with a similar boat said that I should put a 16 by 16 prop on and I will see a big difference in top speed/lower rpms/better gas useage...he also recommended going with a 4 fin prop compared to the standard three fin type..should changing from the current prop to the 16 by 16 solvvvvvvve my problems? ...and is it necessary to buy a 4 fin prop or shoule the 3 finner do the trick??..thanks for your help

 

[Lazy Daze]

Going from a 3-blade to a 4-blade is really just fine tunning. The blade difference, in and of itself, is not going to solve your problem.

There are numerous threads on this site related to your general question. Please try using the search function. It's not the best, but it does work. Along the way, reading through other posts, I'm sure you'll pick-up some other, useful info.

PS: You've been around here long to know you should fill out your signature! Shame on you! :smt001