No wonder, you're about 100 hp short of minimum. What RPM are you making and
what prop do you have?

"george" wrote in message
om...
Can anyone point me in the direction of a website ( or whatever ) to
learn more about propellors?

I have a 28' planing launch, 200 HP V8 GMC 3,500 RPM, Mercruiser stern
leg and top speed is 9 knots - it doesn't even get on the plane.

Suspicion has fallen on the prop.

many thanks!