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ballonet

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bal·lo·net  (bl-n)
n.
One of several small auxiliary gasbags placed inside a balloon or a nonrigid airship that can be inflated or deflated during flight to control and maintain shape and buoyancy.
[French ballonnet, diminutive of ballon, balloon; see balloon.]
ballonet [ˌbæləˈnɛt]
n
(Engineering / Aeronautics) an air or gas compartment in a balloon or nonrigid airship, used to control buoyancy and shape
[from French ballonnet a little balloon]
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Hydrogen gas fills internal ballonets, providing the lift necessary to keep the massive craft airborne.
Near space 2015: a conceptual vision of near-space operations by Steves, Mark / Air & Space Power Journal
Pumping more air into a front ballonet and less out of a rear one while keeping the total volume constant is essentially a transfer of ballast (the air), which shifts the center of gravity of the airship forward.
Back to the future: airships and the revolution in strategic airlift: ... by Gordon, Walter O.; Holland, Chuck / Air Force Journal of Logistics
The ballonet is a zero-porosity internal membrane filled with the inert gas helium.
AeroBalloon USA Flights to Soar Above Boston Common & Franklin Park ... by Business Wire
 
 
 
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