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Old 30 September 2011, 14:38   #1
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RIB leaning to port(a lot) under power

Got a Rib last week its a Humber Scavenger 5.2m with a suzuki 115hp.
Went brill for about an hour moored up and then on journey back when going onto plane you can feel it start to lean to left as power increases lean becomes worse and worse and RIb is very unstable.Have drained all water out as I thought it may be that, have looked at everything , the anode above prop hasn't moved, engine not moved and just cannot think why its doing it... any help would be realy appreciated,as its just not useable as it is now.
Thanks
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Old 30 September 2011, 15:06   #2
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Whats a Humber Scavenger? Not heard of one of them before. Pics please

My destroyer is prone to a little heel but bringing the trim up a little soon sorts it in most cases. Sometimes it is exaggerated by a strong side wind too. How much offset is the motor rigged with?

Mark.
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Old 30 September 2011, 15:27   #3
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Whats a Humber Scavenger? Not heard of one of them before.

I was thinking that too.

I was also thinking 115hp is rather a lot for a 5.2.
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Old 30 September 2011, 16:28   #4
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Humber Scavenger
never heard of one, and we've driven for them at boat shows for years. Not an attractive name for a boat model
is the outboard in the middle of the boat or offset.
Piccie of underside of hull would help for i.d.
Strange if it was ok outbound but not back, suggests a variable such as trim angle or a particularly large crewmember
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Old 30 September 2011, 17:57   #5
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I'll take pictures next week, the conundrum is that it was fine on way out ,left moored for an hour then problem set in.
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Old 30 September 2011, 18:13   #6
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I'll take pictures next week, the conundrum is that it was fine on way out ,left moored for an hour then problem set in.
is the drain bung sealing properly?
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Old 30 September 2011, 20:02   #7
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If you try to rock the motor while on the trailer, is there a lot of play?
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Old 30 September 2011, 23:22   #8
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Thanks I'll check
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Old 01 October 2011, 17:09   #9
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I had a single 275HP RIB that was bad for this ... and it was a really annoying problem because if you left a wave, the boat just wouldnt fly straight .. and kept slamming into waves on the port side.

Trim could sort the ride (to a degree) but it couldnt fix the wave jumping

I tried ballast and that helped, but didnt do much for fuel consumption, in the end I think it was down to an offset problem and the sheer power and torque of the motor.

The trouble is without putting more holes in the transom, you dont really want to move it, so I looked at 'a' trim tab .. but never did it

On this particular boat.. the D section delaminated off the port sponson .. mind you it WAS a Northcraft ... (am I a slow release for Northcraft woes ? .... oh yeah )
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Old 03 October 2011, 05:16   #10
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Well I have had this. Engines act like gyroscopes and can cause the boat if light enough to roll to the right/left depending on rotation,

if yo dont have much hull in the water the porp will make the boat roll to the right.
as its bighting the water and the boat is in the air( well most of it)
so a light 5.2 rib with a big 115 on it will roll.
abviously the roll depands on the way the engine/prop rotates
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