Originally Posted by nob
yeah you're right but how will i know if its over revving, is it just by sound/feel?
Chances are you'll experience emptiness towards the end of your throttle travel, a bit like "blowing in the wind".........much ado about nothing. ( simply put the prop is too small )
The opp side to this is the engine throbbing and sounding "gluggy" and taking an age to spin up. ( in simple terms the prop is too big here )
However it's not a size thing........there is pitch, diameter and slip.
Not an easy thing to work out even for experienced users. You need a prop specialist. Cheapest way out, if you find the right guy/gall.