Des, are you sure you have that the correct way around. Normally the prop runs slower than the engine. Just did a little calc for you... If your engine is at 2800, your prop pitch is 21, slip about 20% and ratio is 1.26 then you should be making 30.4kts.
JW does 1.32:1 then come out as 28 knots, which is what I normally achieve at 2800 revs ?
Well that does make sense I wasn’t sure which way the ratio worked, I had assumed more prop revs = more speed. My boat has always been fast compared to others and this would explain it. Having said that it looses it when full Des
I wasn’t sure which way the ratio worked, I had assumed more prop revs = more speed. My boat has always been fast compared to others and this would explain it. Having said that it looses it when full 
Des
