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Sack, Arthur
Arthur Sack was a farmer who enjoyed constructing aero-models.
In June 1939 in Leipzig-Mockau he attended the First National Contest of Aero-models with Combustion Engines, where he hand-launched his first aero model with a circular wing, the AS-1. It possessed rather poor flying qualities. Arthur Sack's aeromodel measured 125 cm and weighed just 4.5 kg, powered by a Kratmo-30 motor of 0.65 V and 4,500 RPM with a propeller measuring 600 mm in diameter. His circular aircraft was unable to lift off the ground by itself, and finally Sack had to throw it into the air in desperation. After this assisted takeoff, the model managed to perform 100 meters of stable flight, just barely reaching the finish line.
However, the odd-shaped model instantly caught the attention of Air Minister General Udet who was fascinated by the circular shape and gave Sack permission to proceed with his research with official backing. Sack immediately began construction of A.S. aero models of increasing size up to the A.S.5 which was by far the largest flying model. With a wingspan of 125 cm, length of 159 cm, and height of 65.3 cm the two-bladed propeller model took to the air and proved the soundness of the basic design.
From this point on Sack was determined to build a manned machine that would become the Arthur Sack A.S.6V-1.

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