ballonet

A smaller balloon, or steering ballonet, as it is called, is attached to the stern of the kite balloon and acts as a rudder.

This resistance was increased by the rush of air into the open mouth of the steering ballonet.

It had an internal air-bag or ballonet whose capacity was one-fifth that of the envelope.

There are two noteworthy innovations in connection with the ballonet.

Special features is a "belly" of Para rubber in lieu of a ballonet.