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dramatically, but helium gas was 10 times as expensive. Under these conditions, Dr. Eckener, a pilot whose primary concern was safety and as Director of a Company attempting to make a profit, he was forced to make a difficult decision. His discussions with American businessmen and political officials had not resulted in the helium gas he so badly wanted. On the other hand he realized, an airship without lifting gas could not fly. His own company officials believed hydrogen to be safe and they did not share the American concern nor that of Eckener. During many of the flights in 1936, U.S. Naval officials were onboard the LZ-129, to study German operating methods of using hydrogen gas. Their resulting reports concluded that hydrogen properly used, was safe and should be considered used in any new or future American airships. The building of a dream The LZ-129 was a typical design for a Zeppelin airship, only it’s size was so remarkable. The structure was primarily built of triangular girders made of Duralumin, the interior was divided by a wire braced main frame, into 16 bays, in which each held a gas cell.2 Duralumin was an alloy of aluminum and copper with traces of magnesium, manganese, iron and silicon. It had been discovered by Dr. Alfred Wilm and his assistant Ing. Jablonsky, in September 1906. Late one Saturday evening, Jablonsky had completed testing numerous pieces and was ready to go home, when Dr. Wilm entered the lab, with just one more test. To everyone’s astonishment, the test piece was harder, with only ½% more Magnesium having been added. The last train for Berlin had departed and the two men worked the through the weekend, to perfect their Duralumin. Although Dr. Wilm wanted to obtain a patent on this new metal, that so many industries so badly required, he failed to take action. By not obtaining a patent, he gave German industry the opportunity to copy. Count von Zeppelin was amongst the first to realize the value of this new material. Dr. Alfred Wilm did not achieve the wealth he so rightfully desired and passed away on a small farm in the Riesengebirge, on August 6, 1937. Dr. Wilm placed an important mark on not only Zeppelin history, but in the design of countless airplanes ever since.3 The first Zeppelin airships had been constructed of simple aluminum, which is considerably weaker, so that strength was a major problem. It was not until LZ-26, which was the only Zeppelin assembled in Frankfurt-Rebstock, that Duralumin was practically used. Designed as a passenger airship, production of it’s parts had begun, when World War One started. Suddenly, this airship was no longer needed for civilian purposes and would fulfill military requirements only marginally. In order to provide space in the Friedrichshafen Zeppelin Sheds, for newer and larger designs; the completed girders and materials were transported to Frankfurt for assembly. The ship, approx. only 1/8 the
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