The BMW 109-558 is a liquid fuelled sustainer rocket motor developed by BMW at their Bruckmühl facility,Christopher, John. The Race for Hitler's X-Planes (The Mill, Gloucestershire: History Press, 2013), p.127. in Germany during the Second World War.
The 109-558 (with the "109-" prefix being the Reichsluftfahrtministerium, or RLM, designation for reaction-propulsion aircraft power projects, encompassing all jet & rocket engine designs)Christopher, p.124. was designed as a sustainer rocket for the Henschel Hs 117 surface-to-air missile.Christopher, p.127. It was tubular, measuring diameter and about long overall.Christopher, p.127. The engine had a compressed air tank to pressurise tanks for the R-Stoff fuel (50% triethylamine and 50% xylidine) and SV-Stoff oxidiser (94% nitric acid with 6% dinitrogen tetroxide).Christopher, p.127. SV-Stoff was used to cool the combustion chamber.Christopher, p.127.
The 109-558 was capable of propelling an Hs 117 at , with throttle control by sliding valves in the exhaust nozzle, operated by a servomotor controlled by a Mach sensor. Production of the 109-558 took forty to sixty hours using a very high proportion of slave labour.
Applications Henschel Hs 117 Henschel Hs 117H
Specifications
Notes
Sources Christopher, John. The Race for Hitler's X-Planes. The Mill, Gloucestershire: History Press, 2013.