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Updated: June 6, 2025
Two air ballonets were contained in the envelope at bow and stern and the ascent and descent of the ship was regulated by the quantity of air pumped into these. A most curious device was the utilization of heavy cloth for the propeller blades.
The lifting part of the airship comprises a single gas bag fitted with two ballonets provided to ensure the requisite gas-tension in the main envelope, while at the same time permitting, in times of emergency, a rapid change of altitude. Self-contained blowers contribute to the preservation of the shape of the envelope, the blowers and the ballonets being under the control of the pilot.
The space between the ballonets and the outer skin was pumped full of air to keep the latter taut and rigid. Moreover it helped to prevent the radiation of heat to the gas bags from the outer envelope whose huge expanse, presented to the sun, absorbed an immense amount of heat rays. Two cars were suspended from the frame of the Zeppelin, forward and aft, and a corridor connected them.
The ballonet became particularly valuable as soon as airship construction became general, and it was in the course of advance in Astra Torres design that the project was introduced of using the ballonets in order to give inclination from the horizontal.
It was made of layer after layer of gold-beater's skin and contained two ballonets a small ship compared to the Zeppelins, and non-rigid in type. Underneath the great cigar-shaped bag hangs an aluminum car which carries a crew of three men. The pilot sits in front at a wheel that resembles the driving wheel of an automobile. Just behind him is the observer, who also controls the wireless.
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