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Old 23-04-2015, 20:10   #31
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Join Date: Mar 2014
Location: Sydney, Australia
Boat: Lightwave 38' Catamaran
Posts: 229
Re: 9.9 hp on 10' inflatible

I read somewhere that you need 5 hp per person on average to plane. This is also my experience based on the two RIBs we own. We have a 3.4 metre RIB (say 11.3 feet) with Mercury 15 hp 2 stroke. It will just plane with three persons, lots of gear and full fuel. Changing the prop from 9" to 7" made it worse, so I have just changed back. I reckon get 15 hp, probably same weight.

Michael and Kelly
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Lightwave 38' cat
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Old 27-04-2015, 05:51   #32
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Re: 9.9 hp on 10' inflatible

The Tohatsu 9.8 two stroke is the lightest 10hp in the world. 26kg. This are robust and reliable engines. We have one on a Caribe 9 ft rib. The addition of a plate to the engine makes a large difference to the ability to get on the plane easily. We would be without it. Our rib is the Caribe light weight model that has a V at the front and a flat section at the rear. This is a very dry boat and works very well with this engine. We plane with two very easily and with some additional weight but it won't plane with three onboard. The fuel consumption of the Tohatsu is very good even if ran hard most of the time

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