RIB’s between 4.5-6 meters

[lovesnyc]

If you have a RIB between 4.5-6meters what HP, Prop Dia, pitch and top speed are you experiencing? TIA

[Jon Tallis]

5.8 Humber destroyer, 150hpdi, 19" pitch 43kts light load flat water

[Limecc]

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.

[Pikey Dave]

Originally Posted by Limecc

Prop diameter, horsepower, length of RIB or even type of craft do not determine top speed….

Don’t forget the sonar bar

[Poly]

There’s a massive thread on speeds of 6m boats. You can’t compare 4.5m to 6m boats.

[jeffstevens763@g]

To be honest it’s too wide a question to answer to give real info there are many boats in that range if you have a boat in mind you’ll have more chance of realistic performance OMO

[lovesnyc]

Thanks

[ausaviator]

5.1m
80hp
17 pitch 4 blade
34 knots

[dhaglund]

RIB Unlimited 600 (6m)
Mecury Optimax 115 hp
22" Laser II 3-blade prop
47 knots

[Limecc]

Oh boy

How fast is your RIB?