Ballonet



an air or gasbag compartment in a balloon or airship, used to control buoyancy and maintain shape.
Historical Examples

The wind blowing against the opening, which faces it, charges the ballonet with air.
Aeroplanes and Dirigibles of War Frederick A. Talbot

The air pump, which should have pumped the ballonet full of air to keep the balloon rigid failed to work.
Aircraft and Submarines Willis J. Abbot.

The magneto was run by a belt from one of the ballonet blowers.
The War in the Air; Vol. 1 Walter Raleigh.

(p. 067) The balloon frame was divided into seventeen compartments, each of which held a ballonet filled with hydrogen gas.
Aircraft and Submarines Willis J. Abbot.

Special features is a “belly” of Para rubber in lieu of a ballonet.
Jane’s All the World’s Aircraft Various

There are two noteworthy innovations in connection with the ballonet.
Jane’s All the World’s Aircraft Various

It had an internal air-bag or ballonet whose capacity was one-fifth that of the envelope.
The Romance of Aircraft Lawrence Yard Smith

ballonet, filled by a separate motor giving 7.5 inches of water pressure.
Jane’s All the World’s Aircraft Various

It appears to be rearing up on end, as if the extremity saddled with the ballonet were weighted.
Aeroplanes and Dirigibles of War Frederick A. Talbot

noun
an air or gas compartment in a balloon or nonrigid airship, used to control buoyancy and shape

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