Another prop question: 20' MA advice?

[gofastsandman]

Originally Posted by Bushwacker

Sounds like you've done your homework on the motor and tach! Your motor will live much longer and burn less gas and oil if it's propped to turn optimum RPM at WOT. Just make sure you do any testing with the load you typically plan to carry. I thought my 14x20 4B prop was about right till one day I had 6 divers on the boat and could only turn about 4600 WOT!

My 15x15 4B will turn 5400-5500 pretty much regardless of load, and gets on plane MUCH quicker. These 2-strokes have all needle bearings and very short strokes, so high rev's won't hurt 'em. Better to over-rev a bit than to lug 'em down with too big a prop!

This is everything I have ever been told, taught, and believed. I have revvved the piss out of dirt bikes and RD`s. A friend had a Kawi 500 triple with a turbo. He was a sick man.

Four techs from BRP have told me that motor makes 150 @ 5K, and after that you are just over spinning the motor. I asked if they were afraid of us jumping our hulls and overrreving.

They said no. I do not believe that answer. Maybe they are correct, but it goes against my thinking and history.

It does have a sweet spot around 3700 and that is where I run her.

I run an old sst 15 x 16. Not bad, but the PT and Apollo were smoother through the boat and controls. Just can`t spin them. I`m looking for an Apollo 4 bl 15p.

The Mirage plus is also a sweet prop. Have not tried a Stilleto yet.