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Old 08 October 2021, 18:06   #1
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RIBís between 4.5-6 meters

If you have a RIB between 4.5-6meters what HP, Prop Dia, pitch and top speed are you experiencing? TIA
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Old 09 October 2021, 04:05   #2
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5.8 Humber destroyer, 150hpdi, 19" pitch 43kts light load flat water
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Old 09 October 2021, 08:42   #3
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Originally Posted by lovesnyc View Post
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.
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Old 09 October 2021, 10:10   #4
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Prop diameter, horsepower, length of RIB or even type of craft do not determine top speedÖ.



Donít forget the sonar bar
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Old 09 October 2021, 10:27   #5
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Thereís a massive thread on speeds of 6m boats. You canít compare 4.5m to 6m boats.
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Old 09 October 2021, 14:52   #6
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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
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Old 12 October 2021, 18:34   #7
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Thanks
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Old 13 October 2021, 07:04   #8
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5.1m
80hp
17 pitch 4 blade
34 knots
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Old 13 October 2021, 08:28   #9
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RIB Unlimited 600 (6m)
Mecury Optimax 115 hp
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Old 13 October 2021, 09:16   #10
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Oh boy

How fast is your RIB?
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