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By the start of the Great War the airship had been developed into two main types - rigid and non-rigid (technically, the latter is more accurately described as pressurerigid). Cylindrical in cross-section, both were given buoyancy by gas and motion by engine-driven propellers and were controlled by vertical rudders and horizontal elevators. In the rigid type, a solid framework, which might be likened to a skeleton, supports an external covering of fabric called the envelope (a very few experimental types had a metallic covering). Within the framework are contained bags of gas called balloonets. In the non-rigid, the envelope's shape is maintained by the pressure of the gas that fills it; there is no framework.The rigid's control car and engines are suspended from the framework; |
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This may sound incredible, but it has all been done before. in the non-rigid they are attached directly to or suspended directly from the envelope. In some later rigids the engines were mounted internally, driving the propellers by transmission belts. |
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