Originally Posted by Projectile
Yes, prop is correct diameter. It is the OEM prop for this motor.
I have not tried any other props, yet.
Do you have experience with higher pitch prop reducing ventilation?
Is this your problem?
IE The boat gets up on plane OK, then levels off, then when it gets to cruising speed, then it feels like the prop is losing its grip and the revs go up, and the boat slows down?
You could be suffering from 'hook or 'hollow'.
AFAICR ventilation /cavitation also occurs when
a) the prop diameter is too small i.e. the engine can turn it, without the prop being able to grip in the water
b) the prop pitch is far too small i.e. he engine can turn it, without the prop being able to grip in the water,
c) if the prop pitch is too large and the diameter too small i.e. the engine can turn it too fast, so the prop being able to grip in the water.
If the prop diameter is too large you will not get full revs from the engine.
If you have a longer pitch, (and not too heavy a load) and you slowly apply throttle you will eventually plane. Quick adjustments to the throttle will not help.
Does any of this apply to your experience?