Aviation physics: What are the differences in air bouyancy and lift.What's the...

[pablo941]

...fastest lighter than air craft? Does lift require thrust, whilst bouyancy is a counterbalance to weight

 

[Timbo is here]

Buoyancy in the air as in water is down to the displacement of the air by something that is overall lighter than air- thus it floats.
Lift is created when air passes over a wing like section or under a flat body thus creating upward suction due to the lower pressure of the air above travelling a longer distance

 

[Nemo Y]

buoyancy is a kind of lift Force

 

[mindworms]

buoyancy applies to all submerged bodies.
because of that, even the heavier than air bodies are lifted by a force equivalent to the mass of liquid displaced by the body (in this case, air)
the force is just TOO small to keep the [heavier than air] aircraft floating.


if you constructed an airship that would be profile shaped, it would produce both aerodynamic lift AND buoyancy lift when moving forwards. (think of it as of some type of the lift producing wingless hull bodies, such as the designed reentry space modules)