What is the mechanism of flight for each one? That is, how does each fly?
A blimp uses gas that is lighter than air to generate lift. Today they use helium, becuase it is not flammable. As the blimp rises, outside air pressure decreases and the helium in the envelope expands.
A hot air balloon uses hot air to lift off and stay afloat. Hot air is lighter than cool air because it has less mass per unit volume.
Dirigibles produce lift by filling its main cavity with another gas that is lighter than air.
http://en.wikipedia.org/wiki/Airship
http://travel.howstuffworks.com/hot-air-balloon.htm
http://travel.howstuffworks.com/blimp2.htm
A blimp uses gas that is lighter than air to generate lift. Today they use helium, becuase it is not flammable. As the blimp rises, outside air pressure decreases and the helium in the envelope expands.
A hot air balloon uses hot air to lift off and stay afloat. Hot air is lighter than cool air because it has less mass per unit volume.
Dirigibles produce lift by filling its main cavity with another gas that is lighter than air.
http://en.wikipedia.org/wiki/Airship
http://travel.howstuffworks.com/hot-air-balloon.htm
http://travel.howstuffworks.com/blimp2.htm
No comments:
Post a Comment