can someone please help with the following query regarding propeller
specification.
On our RIB is a mariner 100 outboard, we are told the engine will only make
100hp at 5000rpm, so have just fitted a rev counter, we now find that the
engine is only achieving 4400 rpm with anow weight load on the boat in river
conditions, therefore we believe the propeller on the boat to be incorrect.
The current prop has the number 4877344A4017P on it but we also have a spare
prop with a very slightly different no ie. 4877344A40L17P, these numbers do
not mean a lot to me personally, but I am sure they witll to some people, we
assume we need a slightly smaller prop to achieve 500rpm, but any advice
would be greatly appreciated.