At the same time, Hellmuth Walter's experiments into hydrogen peroxide based rockets were leading towards 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, 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.