Originally Posted by lovesnyc
If you have a RIB between 4.5-6meters what HP, Prop Dia, pitch and top speed are you experiencing? TIA
Prop diameter, horsepower, length of RIB or even type of craft do not determine top speed. This is a function of pitch, prop slip and propeller rpm (engine rpm x gearbox ratio).
So if you know what engine and pitch, you can lookup the max rpm and gearbox ratio, can approximate the slip and estimate with a large degree of probability what the top end is provided its not over-propped and can pull max rpm.