Back in Germany and Construction At Tempelhof
In Germany in 1894, Carl Berg procured a contract to build an airship for Royal Prussian Government, citing Schwarz as idea-provider. Carl Berg had already experience in working and developing the then new aluminium, and was to later deliver parts for Zeppelin's first airship. With financial and technical help from Berg and his firm, the airship was designed and built.
The construction began in 1895 at the Tempelhof field in Berlin. For a time the Prussian Airship Battalion put its grounds and personnel at Schwarz's disposal. The pieces were produced in Carl Berg's Eveking Westphalia factory and under the direction of Schwarz, assembled in Berlin. A gondola, also of aluminium, was fixed to the framework. Attached to the gondola was a 12 horsepower (8.9 kW) Daimler engine that drove aluminium propellers. One of the propellers was used to steer the craft.
In 1896 June Carl Berg was in Moscow and sent a card to his stepfather, apparently indicating that he had searched for information on Schwarz and became cynical of delays and was nearly convinced he had been swindled.
Due to delays, the airship was first filled with gas on 1896-10-09 and tested, but the results were not satisfactory because the hydrogen gas delivered by the Vereinigten Chemischen Fabriken from Leopoldshall (part of Staßfurt) was not of the required quality and did not provide sufficient lift. (Some sources mention a test was done on October 8, 1896.) It was reckoned that gas with a density of 1.15 kg per cubic metre was needed. Gas with that quality could not be produced until 1897-01-13, the day of Schwarz's death.
Read more about this topic: David Schwarz (aviation Inventor)
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