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Old 27 August 2013, 05:16   #1
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,235
What determines the max hp on a small rib/sib?

My 2.5m Avon RIB is rated to 4hp, yet there seems to be 3m ish SIBs and RIBs that take 15hp 20hp even 30hp.

With a hard hull for the transom to attach to, I'd have envisaged i could put a Twatsoo 9.8 on the back. The 2hp 90's merc is about half it's weight i think....

Any thoughts?

Other than that it would be fun.

HUMBER P4VWL is offline   Reply With Quote
Old 27 August 2013, 05:46   #2
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,649
I guess it's probably CE ratings or something - either down to how well the transom is attached to the hull or it could become ridiculously unstable at speed.....

...which brings you back to fun!
9D280 is offline   Reply With Quote


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