Bouyancy is based on how much water is displaced, not amount of air inside the container. 66x12x13=10,296 cubic inches. Fresh water density is about 0.0361 lb/in^3 so that case has to displace at least 372 lb to sink.
Metric would be better for this but we’re talking about a stinger missile here.
I read your comment, then went to make a joke response to someone else about placing a vacuum chamber inside the case to reduce its buoyancy.
This set off a several minute long internet hunt where I learned about Archimedes Principle, which you clearly describe. It turns out the only vacuum here is the one in my head.
To wit: If placed inside the case, my empty head would reduce the buoyancy, but only by its own weight.
A Pyrrhic victory.
Bouyancy is based on how much water is displaced, not amount of air inside the container. 66x12x13=10,296 cubic inches. Fresh water density is about 0.0361 lb/in^3 so that case has to displace at least 372 lb to sink.
Metric would be better for this but we’re talking about a stinger missile here.
I read your comment, then went to make a joke response to someone else about placing a vacuum chamber inside the case to reduce its buoyancy.
This set off a several minute long internet hunt where I learned about Archimedes Principle, which you clearly describe. It turns out the only vacuum here is the one in my head.
To wit: If placed inside the case, my empty head would reduce the buoyancy, but only by its own weight.
A Pyrrhic victory.
My boy Archie figured some stuff out a long time ago! Unfortunately he didn’t get the story straight about phlogiston