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+ Transport + Flight + Lighter than Air 1
Semi-rigid Airship
But as airships were built larger, and greater speeds were obtained, it became necessary to strengthen the envelopes with some form of keel; and this led to a type which is known as the semi-rigid, and is developed successfully in France. The figure illustrates an airship of this build. Along the lower side of its envelope is placed a light, rigid framework or keel, and from this is suspended the car which contains engines and crew. A. Gas-containing envelope B. Strengthening keel C.C. Stabilising-planes D. Rudder E. Car carrying engines, propeller, and crew.