i know this isn't a cannon, but was wondering if this would work, would a pressurized buoy ( probably just a 4" pvc pipe with two endcaps) at 100psi have more buoyancy than with out the pressure?
im thinking of making a topwater ROV and was wondering if this could compensate for the weight of all the gear
edit by MrC: Not exactly sure what this had to do with combustions, it's like you just randomly selected a topic section without reading, or thinking for that matter. Topic moved.
pressurized buoy
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velocity3x
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Internal pressure has nothing to do with buoyancy. Buoyancy is determined by weight and displacement.
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Brian the brain
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If you put more pressure in it, it will be less boyant because of the extra ( minimal) weight of the air..
A vacuume would create slightly better boyancy..not noticable but still..
A vacuume would create slightly better boyancy..not noticable but still..
Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!
Can't ask for a better compliment!!
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Lentamentalisk
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That said, if you plan on taking it super duper deep, having some internal pressure in the pipe to counteract the immense pressure from the water might not be a bad idea...
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jimmy101
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Bouyancy = weight of the water displaced by the object - weight of the object.
Any part of the object that is out of the water contributes to the weight but not to the volume of displaced water.
Air at 1 ATM weights about 1g per liter. 1 liter of water weighs 1000 grams. You chamber probably weighs a couple hundred grams. So the gas inside the chamber contributes relatively little to the total weight of the chamber. If you used air at 2 ATM you would increase the total weight, and decrease the bouyancy, by 1 gram. (Roughly the weight of 20 drops of water.)
If you pumped the chamber down to a full vacuum the bouy would be able to lift (bouy) about 1 more gram than with air at 1 ATM.
Any part of the object that is out of the water contributes to the weight but not to the volume of displaced water.
Air at 1 ATM weights about 1g per liter. 1 liter of water weighs 1000 grams. You chamber probably weighs a couple hundred grams. So the gas inside the chamber contributes relatively little to the total weight of the chamber. If you used air at 2 ATM you would increase the total weight, and decrease the bouyancy, by 1 gram. (Roughly the weight of 20 drops of water.)
If you pumped the chamber down to a full vacuum the bouy would be able to lift (bouy) about 1 more gram than with air at 1 ATM.
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Gun Freak
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WRONG. It's 1g per mililiter.jimmy101 wrote:Air at 1 ATM weights about 1g per liter.
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Gippeto
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Pure water weighs 1 gram per milliliter...last time I checked...air was lighter than water.Gun Freak wrote:WRONG. It's 1g per mililiter.jimmy101 wrote:Air at 1 ATM weights about 1g per liter.
He's a heck of a lot closer than you are. If I decide to trust wikipedia (
), I get 1.2grams per liter.http://en.wikipedia.org/wiki/Density_of_air
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Gun Freak
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Oh crap, I thought he said water 
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One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!