Prop size and top speed

[ThomasX]

Hi

Any ideas on which prop size would best suit a Tornado 6.5m with a Yamaha 115 V4 2 stroke engine?

And what top speed one can expect?

Thanks!

[paintman]

What prop have you currently got on it?
With the boat correctly trimmed & carrying its normal load what's your current Wide Open Throttle speed?
What is the WOT rpm?
Does that fall within the engine manufacturer's recommended WOT range?

[jonp]

Its pretty easy to put your prop pitch, gear ratio and max rpm into a prop calculator to find what sort of speed you can expect from any given prop and engine https://www.mercuryracing.com/propel...alculator.html