Aggregate Series Development
Based on the film cooling ('veil cooling') solution identified by colleague Moritz Pöhlmann at Peenemünde, Thiel designed annular rings of tiny perforations to inject unburnt fuel through the chamber walls at the throat for evaporative cooling to prevent V-2 rocket nozzle erosion.
By September 15, 1941, Thiel officially declared the basic eighteen-pot design of the A-4 motor finished.
Earlier in the Spring of 1941, Thiel began investigating nitric acid and diesel oil to be used as the fuel for the 30-ton-thrust A-8 .
Then on December 18, 1941, Thiel documented the initial A-9/A-10 motor design of six combustion chambers into one common nozzle in Secret Command Document 1496/41.
By the middle of August 1943, Dr Thiel declared that the A-4 developmental problems preclude mass production, recommended the project be abandoned, and resigned with notification he intended to lecture thermodynamics at a technical college. Thiel was killed days later in the Operation Hydra bombing raid on Peenemünde - Martin Schilling replaced Thiel.
Read more about this topic: Walter Thiel
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