(see the German Walter).

Professor Helmuth Walter was a chemical researcher in Kiel.

-There he experimented in torpedo propulsion systems based on hydrogen peroxide.

-Towards 1935 he began working on rocket engines and founded the "Hellmuth Walter Kommanditgesellschaft".

“Hellmuth Walter”

-His most known engine was the HWK-109-509, but before he started with the RI-202, RI-203, RI-210, RII-203 and RI-211.

“HWK 109-509”

-These RI engines gave way to the 109-500 and the 109-501 and finally to the 109-509 in A, B, C, D versions, which were used in rocket planes during the last days of the war like the Me-163.

“HWK 109-500”

-The -500 and -501 were used as take-off aid engines and that once consumed were dropped and they lowered with a parachute that was stored in the front of the engine nacelle, which opened automatically. These were recovered for reusing them.

"Rocket launch and gondola"

-We can see the rope that opens the parachute when the engine comes off.

-Recently we got hold of a spectacular launch view of the two engines, once its function has been completed.

“Launch”

-Hence the -500 and -501 were reusable after this process.