American Heritage® Dictionary of the English Language, Fourth Edition
- 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. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The remote-controlled AirJelly is kept in the air by its helium-filled ballonet.”
“And the chamber inside the envelope that expands and contracts to compensate for changes in helium pressure is called a ballonet.”
“The gas-bag comprises a single chamber for the inflating agent, the distended shape of the envelope being sustained by means of an air-ballonet.”
“If it is desired to descend the gas is driven from the forward to the after end of the envelope, merely by inflating the bow ballonet with air by means of a pump placed in the car.”
“If ascent is required, the after-ballonet is inflated, thereby driving the gas to the forward end of the balloon, the buoyancy of which is thus increased.”
“It appears to be rearing up on end, as if the extremity saddled with the ballonet were weighted.”
“The wind blowing against the opening, which faces it, charges the ballonet with air.”
“The supply of air for filling these is taken from the propeller draught by a slanting aluminium tube to the underside of the envelope, where it meets a longitudinal fabric hose which connects the two ballonet air inlets.”
“The envelope contained a single ballonet for regulating the pressure of the gas.”
“To ensure that this is always done the ballonet valves are set to open at less pressure than the gas valves.”
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