Float design safety

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Doggzilla

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That’s not a bad idea guys. Foam has been added inside some existing aircraft wings because it helps with fluttering by stiffening the wings.

In one case someone opened up the wing on their Hummel Bird to enlarge the tanks, and adding foam to the other sections to replace a lost cross member actually resulted in better flutter control.
 

litespeed

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What's that stuff that generates hydrogen when in contact in water? Used to inflate balloons in WW2 life rafts.

Just put a balloon on the top of the plane, with some of that stuff. Then when it gets wet it will automatically inflate the balloon and right the plane.
That would be sodium metal- generates a lot of heat, Oxygen, Hydrogen and then goes boom!

I would go for a large airbag deployed from the top of the cabin to lift the craft from the water.

This has been done on some rescue boats and works brilliant- brings it back upright. For a aircraft just getting it above the water upside down would be ok.
 

litespeed

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Here is a self righting airbag for a rescue boat.

Same principle but could be made lighter.



vid of one in action
 

BJC

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That’s not a bad idea guys. Foam has been added inside some existing aircraft wings because it helps with fluttering ... In one case someone opened up the wing on their Hummel Bird to enlarge the tanks, and adding foam to the other sections to replace a lost cross member actually resulted in better flutter control.
Does that mean that they tested to a new, higher, Vd?


BJC
 

Doggzilla

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Does that mean that they tested to a new, higher, Vd?


BJC
I guess you could technically say that. He did test it up to something like 160-180mph without flutter (It was a far more powerful engine than stock, which was the entire reason he was hitting flutter speeds in the first place)
 

PMD

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not enough displacement in wings. I have thought about this for years (having lived a decade in the bush) and thought that something like an airbag under a blow-off panel near each wingtip would keep a float place from rolling over. Sadly, though, many sinkings happen when nose of floats are pushed below surface and tail goes over nose - when wing buoyancy would be of little help
 
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