h a l f b a k e r yInvented by someone French.
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[edit: clarification]
Useful for ships under attack from the air. A kit like this for
lifeboats could be useful when abandoning ship at war.
[added] It's made of inflatable rubber. In order to submerge,
water-filled plastic bags are hoisted over the structure.
The magic of a cereal box.
https://en.wikipedi...ng_powder_submarine
[RayfordSteele, May 30 2017]
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Annotation:
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Submerging is easy; coming back up is the hard part. |
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Ships are typically designed with significant positive buoyancy. This is so that they don't sink. |
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To submerge, the vessel would need slight negative buoyancy. |
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This would place the keel deep below the water surface. The hull would need to be substantially stronger than a conventional design to avoid it being crushed by the water pressure, presuming that the entire interior of the vessel is free-vented to atmosphere. |
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The "cover" is going to have to be a rigid metal structure. It will be heavy, and change the hull's metacentric height. This is generally considered unhelpful ... |
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It's made of inflatable rubber. In order to submerge, water
filled plastic bags are hoisted over the structure. |
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I'm not sure I'm clear on this. So you're basically covering
the entire vessel with a big water balloon? |
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If that's what you're talking about the water balloon would
sit right below the surface at best with a bump in the
middle where the ship is. |
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You'd need to have some way to keep the water located
above the ship from flowing over the sides down into the
lower portion of the bag otherwise you'd just be wrapping
the ship in rubber, which would not only give the attacker
a clearer, larger target to shoot at but they'd mock your
engineering aptitude before they killed you. |
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I've taken the liberty of assuming the design has a flooded
outrigger portion to keep the ship upright as it sunk
because if you just have a big rubber thing full of water
above deck the vessel would just flip over. Again,
humorous
for the attacker to see you roll over and play dead as they
begin their attack profile, but not much good to keep you
from being made dead for reals. |
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Designing a ship that floats on the water is easy, designing
a ship that submerges is easy, designing a ship that
submerges
then comes back up, not so easy. |
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If I'm totally misunderstanding your design, never mind. |
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Perhaps Draping sea colored camouflage over side so
it looks like the sea has a pimple or a permanent
wave where the ship used to be. Would make it
much harder to aim at something vital. |
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Or tow a dummy ship or lifeboat, so there two
targets. One could appear partly submerged. The
floating solar still many lifeboats contain could take
on a decoy function. |
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You're all thinking too unambitiously. Consider a combination of a submarine aircraft carrier, and a floating dry dock. The watertight hangar section of the submarine would be large enough to fully enclose the ship. The door would be shut and sealed and then the vessel could submerge, containing the ship within it. |
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If a ship was torpedoed, then that emergency airbag
superstructure might be a pleasant alternative to Davy
Jones' locker. |
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Oh this is too easy. Just fill the ballast area full of baking
powder. |
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Really though, to design a ship that can handle being under
water, start with a submarine and go from there. |
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+!! @william t. (emergency airbag) |
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