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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The HWK 109-509 was a German liquid-fuel bipropellant rocket engine that powered Messerschmitt Me 163 and Bachem Ba 349 aircraft. It was produced by Hellmuth Walter Kommanditgesellschaft commencing in 1943.The HWK 109-509 used a two component hypergolic fuel/oxidizer combination, controlled by two pumps, to regulate the rate of combustion and thereby the amount of thrust. The engine worked on the principle of the hot" Walter drive which used C-Stoff in place of Z-Stoff, the latter tending to clog the jets in the combustion chamber, causing fluctuations in power and potentially explosions."