one of several small balloons, inside a dirigible, that can be inflated or deflated to control buoyancy during flight
A Ballonet is an air-filled flexible container that is located inside the envelope of a non-rigid or semi-rigid airship. Such an airship can have one or more ballonets, commonly one fore and one aft. Because air is heavier than the lifting gas, the ballonets are deflated or inflated with air to maintain the external shape of the airship during ascent or descent. They can also be used to control the pitch of the airship. The lower image illustrates the principle of a balloon within a balloon. The outer balloon represents the airship's outer envelope or gasbag; the red inner balloon represents the ballonet. In an airship the ballonet would be much smaller relative to the size of the gasbag, e.g. in the French airship Lebaudy Patrie the ballonet's volume was approximately one-fifth that of the envelope. The ballonet valves were originally a butterfly type, actuated by a spring system. The principle of actuation being that as the pressure rises in the ballonet, the spindle of the butterfly valve is compelled to turn under the increasing spring force, so relieving the pressure. More recently actuation of the valve is done electrically with either a linear actuator or a linear solenoid, the latter being the favoured fail-to-safe arrangement.
The numerical value of ballonet in Chaldean Numerology is: 3
The numerical value of ballonet in Pythagorean Numerology is: 9
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