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#1
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An amphibian that sank?
http://www.divingservices.net/aircraft.jpg
http://www.divingservices.net/9bcess2.jpg Anyone have the story behind this? Strange that a plane designed to float, sank! The Monk |
#2
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An amphibian that sank?
"Flyingmonk" wrote in message ups.com... http://www.divingservices.net/aircraft.jpg http://www.divingservices.net/9bcess2.jpg Anyone have the story behind this? Strange that a plane designed to float, sank! Doesn't seem any stranger than a boat sinking. I believe they're designed to float as well. |
#3
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An amphibian that sank?
"Flyingmonk" wrote in message ups.com... http://www.divingservices.net/aircraft.jpg http://www.divingservices.net/9bcess2.jpg Anyone have the story behind this? Strange that a plane designed to float, sank! The Monk I could be wrong, but wasn't the Titanic designed to float? :-) DH |
#4
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An amphibian that sank?
"Flyingmonk" wrote in message ups.com... http://www.divingservices.net/aircraft.jpg http://www.divingservices.net/9bcess2.jpg Anyone have the story behind this? Strange that a plane designed to float, sank! It broke the law . . . . Law of gravity (and the law won) |
#5
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An amphibian that sank?
"Steven P. McNicoll" wrote in message
ink.net... Doesn't seem any stranger than a boat sinking. I believe they're designed to float as well. These days, smaller boats often have flotation chambers filled with a closed cell type foam (e.g. styrofoam) so that in the even that they are filled with water, they might still remain on the surface, dependent upon what else might be loaded in the boat... It wasn't always that way though... I've helped recover sunken boats before that sank after hitting logs and such and knocking holes in their bottom... Larger boats aren't required to have this sort of positive flotation though... Don't remember exactly at what length the requirement no longer applies... Probably around 25-30 ft or so, I guess... It's quite possible that amphibs don't have this sort of design in them... |
#6
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An amphibian that sank?
In article ,
"Grumman-581" wrote: "Steven P. McNicoll" wrote in message ink.net... Doesn't seem any stranger than a boat sinking. I believe they're designed to float as well. These days, smaller boats often have flotation chambers filled with a closed cell type foam (e.g. styrofoam) so that in the even that they are filled with water, they might still remain on the surface, dependent upon what else might be loaded in the boat... It wasn't always that way though... I've helped recover sunken boats before that sank after hitting logs and such and knocking holes in their bottom... Larger boats aren't required to have this sort of positive flotation though... Don't remember exactly at what length the requirement no longer applies... Probably around 25-30 ft or so, I guess... It's quite possible that amphibs don't have this sort of design in them... *23.751***Main float buoyancy. (a) Each main float must have‹ (1) A buoyancy of 80 percent in excess of the buoyancy required by that float to support its portion of the maximum weight of the seaplane or amphibian in fresh water; and (2) Enough watertight compartments to provide reasonable assurance that the seaplane or amphibian will stay afloat without capsizing if any two compartments of any main float are flooded. (b) Each main float must contain at least four watertight compartments approximately equal in volume. |
#7
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An amphibian that sank?
"Roy Smith" wrote in message
... 23.751 Main float buoyancy. (a) Each main float must have (1) A buoyancy of 80 percent in excess of the buoyancy required by that float to support its portion of the maximum weight of the seaplane or amphibian in fresh water; and (2) Enough watertight compartments to provide reasonable assurance that the seaplane or amphibian will stay afloat without capsizing if any two compartments of any main float are flooded. (b) Each main float must contain at least four watertight compartments approximately equal in volume. I don't see anything in there that would require the supposedly watertight compartments to still provide floatation in the event of them no longer being watertight... On a side note, I've heard that for emergency floats on offshore (oil rig) helicopters, they often end up with the floats on the surface and the helicopter suspended underneath it in the water.. |
#8
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An amphibian that sank?
"Flyingmonk" wrote in message ups.com... http://www.divingservices.net/aircraft.jpg http://www.divingservices.net/9bcess2.jpg Anyone have the story behind this? Strange that a plane designed to float, sank! You might be surprised how many recreational boats sink. There are dozens of thing that can happen. Most common are drain plug left out/loose, seals or hoses leaking and slowly filling the boat. -- Jim in NC |
#9
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An amphibian that sank?
In article ,
"Grumman-581" wrote: On a side note, I've heard that for emergency floats on offshore (oil rig) helicopters, they often end up with the floats on the surface and the helicopter suspended underneath it in the water.. One of the fundamental truths of boat design is that the center of gravity has to be lower than the center of bouyancy. If it's not, then eventually the boat (helicopter, whatever) will figure out how to turn itself over so that it is. |
#10
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An amphibian that sank?
"Roy Smith" wrote One of the fundamental truths of boat design is that the center of gravity has to be lower than the center of bouyancy. If it's not, then eventually the boat (helicopter, whatever) will figure out how to turn itself over so that it is. Not completely true, but right to a degree. In the case of a heli or plane on floats, the center of gravity is way higher than the center of buoyancy, and everything continues to work out OK. In that case the center of gravity is between the outer points of buoyancy. Like this: GGG BB BB Then if it gets a little sideways, and the gravity is on the outside of buoyancy, things will re-adjust. GGG BB BB Ker-splash! Soon it is stable again, but in a bad (g) way: BB BB GGG -- Jim in NC |
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