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Experiments with rocket aircraft

In 1936, von Braun's rocketry team working at Kummersdorf investigated installing liquid-fuelled rockets in aircraft. Ernst Heinkel enthusiastically supported their efforts, supplying a He-72 and later two He-112s for the experiments. Later in 1936, Erich Warsitz was seconded by the RLM to von Braun and Heinkel, because he had been recognized as one of the most experienced test pilots of the time, and because he also had an extraordinary fund of technical knowledge. After he familiarized Warsitz with a test-stand run, showing him the corresponding apparatus in the aircraft, he asked: "Are you with us and will you test the rocket in the air? Then, Warsitz, you will be a famous man. And later we will fly to the Moon – with you at the helm!"

In June 1937, at Neuhardenberg (a large field about 70 km (43 mi) east of Berlin, listed as a reserve airfield in the event of war), one of these latter aircraft was flown with its piston engine shut down during flight by Warsitz, at which time it was propelled by von Braun's rocket power alone. Despite a wheels-up landing and the fuselage having been on fire, it proved to official circles that an aircraft could be flown satisfactorily with a back-thrust system through the rear.

At the same time, Hellmuth Walter 's experiments into hydrogen peroxide based rockets were leading toward light and simple rockets that appeared well-suited for aircraft installation. Also, the firm of Hellmuth Walter at Kiel had been commissioned by the RLM to build a rocket engine for the He-112, so there were two different new rocket motor designs at Neuhardenberg: whereas von Braun's engines were powered by alcohol and liquid oxygen, Walter engines had hydrogen peroxide and calcium permanganate as a catalyst. Von Braun's engines used direct combustion and created fire, while the Walter devices used hot vapors from a chemical reaction, but both created thrust and provided high speed. The subsequent flights with the He-112 used the Walter-rocket instead of von Braun's; it was more reliable, simpler to operate, and safer for the test pilot, Warsitz.