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Old 06 July 2011, 05:34   #1
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xs 400's Avatar
 
Country: UK - England
Town: yeovil
Boat name: Lilly of lyme
Make: XS
Length: 4m +
Engine: 30hp Yamaha
Join Date: Jul 2011
Posts: 631
new to ribs advice please!!

I have a 4m med v hull with a 30hp 2 stroke Yamaha

the performance is ok but it is a little slow to get on the plane and top speed is 26 mph

how can I improve this without buying a bigger engine?????

spec. prop 9 7/8 x 13f engine low hours no issues , doel fins on engine, no rev counter so dont know flat out revs (but dont seem high)
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Old 06 July 2011, 05:43   #2
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Country: UK - Channel Islands
Town: Alderney
Length: no boat
Join Date: Sep 2006
Posts: 3,047
I think your other thread about a different prop is worth a go, but a 4m RIB with 30HP is not going to be super-quick unfortunately.

For comparison we have supplied many SIBs, which would be lighter than your XS, with 30HP engines and customers have given thought to upping slightly to a 40HP or even a 50HP in some cases.

PS The fins will help with trim and therefore getting on the plane, but will eat into your tops speed.
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