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Old 18 July 2008, 15:00   #11
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The Bombard C3, C4 and C5 all have wooden keels. Not designed to work on flexing as much as provide a deeper V (they have hinges). Although you can bolt them together and that helps a little. If you don't have one of these boats, building a wooden keel is no small task. The fabric may need reinforcement and it may not help much absent more V anyway.

If your floor is otherwise installed correctly, you need a different boat or milder sea conditions.
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Old 19 July 2008, 13:23   #12
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How about some custom shaped hard polystyrene panels to go between the floor and the material of the hull. They would be light and still flexible, but prevent the hull from forming pressure pockets. Might give it a try on mine if I start getting the same effect. Maybe a business opportunity for someone
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Old 21 July 2008, 11:18   #13
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have you thought about making the whole keel, and deck from GRP. then you could make GRP "running surface" on the hull too and just have the tubes around the outside...

oh wait someonese already done that...
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Old 21 July 2008, 14:52   #14
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oh wait someonese already done that...
Who?

Ideally I would prefer keel-shaped air deck underneath my aluminum floor. Not sure if some one can make it.
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Old 21 July 2008, 15:01   #15
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How about some custom shaped hard polystyrene panels to go between the floor and the material of the hull.
Thought of that. Still have no idea how to hold them on place as close as possible to hull material. Inflate soccer balls on each side?
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Old 21 July 2008, 15:53   #16
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Who?

Ideally I would prefer keel-shaped air deck underneath my aluminum floor. Not sure if some one can make it.
it was an attempt at being amusing. you seem to be looking for a stiff/solid hull/keel and stiffer deck - the answer is of course to get rid of the inflatable boat and buy a RIB.
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Old 21 July 2008, 16:03   #17
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it was an attempt at being amusing.
Shame on you
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you seem to be looking for a stiff/solid hull/keel and stiffer deck - the answer is of course to get rid of the inflatable boat and buy a RIB.
Well answer is right but circumstances are wrong. Unfortunately. I have storage issue as for now. So that is why I am open to an ideas as long as they would not cost too much.
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Old 21 July 2008, 17:04   #18
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Shame on you Well answer is right but circumstances are wrong. Unfortunately. I have storage issue as for now. So that is why I am open to an ideas as long as they would not cost too much.
I guess there was another point though. Which was - it probably will cost money, take effort and diminish many of the advantages of a SIB, e.g. portability in terms of size and weight
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Old 22 July 2008, 13:30   #19
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i have known people to fill keels or tubes with expanding foam but it stops the inflate /deflate aspect of the boat .
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Old 24 July 2008, 11:19   #20
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Someone mentioned to me once that there was a solid fiberglass insert available that fit under the keel and floorboards to hold a more rigid V. Never heard anything else about it, though, so it may have been smoke. It was supposed to be for an Achilles SIB.

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