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Old 14-02-2015, 20:02   #31
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Re: horsepower to plane a 10' RIB

Good rule of thumb with most 10 foot or so RIBs: Figure at least 5 hp per person to plane up.
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Old 14-02-2015, 23:54   #32
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Re: horsepower to plane a 10' RIB

My wife and duaghter can just about start our 25hp but only when the sea is glassy. She can start the kids 15hp without any issue. Both of these (Yamaha Enduro's) always start first or second pull. Our three sons can start any of the engines now they are bigger.
Beware the weight of these engines though - when its flat calm it is difficult manhanding such a lump - we use an outboard crane to ensure we don't drop them. When the sea is lumpy I wouldn't even try to do anything. We are fortunate to have an aft platform that the duck (dinghy) sits on whilst wearing its outboard motor.
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Old 15-02-2015, 00:57   #33
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Re: horsepower to plane a 10' RIB

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Originally Posted by colemj View Post
Are you sure you are under-propped? If it takes a lot of time and hp to get onto plane with 4 people, it sounds like you may be over-propped, not under.

We have the same outboard with probably the same standard prop. Our 12' 350lb dinghy will take all 20hp to slowly bring 4 "American" people on plane. I recently borrowed another prop that was 1 inch less in pitch - and with this prop the dinghy popped right up on plane with 4 people instantly and stayed on plane at 1/2 throttle.

Mark
The OP didn't suggest he was over- or under-propped - he just asked about motors.
My 3.3 Tohatsu 2 stroke, on a 2.76m, inflatable keel rubber dinghy just gets onto the plane in calm water with just me aboard.
I am flabbergasted, gobsmaked etc. @ the motor powers recommended on these posts. But then I'm not American and weigh 100kg (220.4 lbs).
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Old 15-02-2015, 01:17   #34
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Re: horsepower to plane a 10' RIB

I can plane my 10' soft bottom with wood floor with a 6hp Evenrude. Get the weight forward until she's on the step them move back anywhere you want.
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Old 15-02-2015, 06:18   #35
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Re: horsepower to plane a 10' RIB

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Originally Posted by chasfgr View Post
The OP didn't suggest he was over- or under-propped - he just asked about motors.
My 3.3 Tohatsu 2 stroke, on a 2.76m, inflatable keel rubber dinghy just gets onto the plane in calm water with just me aboard.
I am flabbergasted, gobsmaked etc. @ the motor powers recommended on these posts. But then I'm not American and weigh 100kg (220.4 lbs).
I wasn't responding to the OP - I quoted another poster and responded to him.

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Old 15-02-2015, 06:23   #36
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Re: horsepower to plane a 10' RIB

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Well that's awesome! We were looking at the Yamaha's at 111 vs. our 87.

How hard is it to start that 20 Hp manually?
Actually, the S20 is 97lbs.

It is really easy to start the engine because it has a decompression feature - pull the rope out a little bit and it engages the decompression, which then makes the full-pull very easy. Or if you prefer, just pull the rope like normal and you feel a resistance at first, but the rest of the pull is easy.

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