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Planned license production of the DH Tiger Moth.

Source: Aerokurier 1970

RK 12 (moth)
On November 15, 1927, the company newspaper "Sportflieger" reported on the planned licensed construction of the world-famous DeHavilland moth. This aircraft was built in 1925 and had conquered a large market in the English Empire at the time. It was offered by the factory with a Cirrus Mk 2 engine with 80 hp at a price of 14,100 RM. However, the DLV did not give permission for the licensed construction because the strength of the airframe did not seem to be sufficient. Prof. Madelung was responsible for the rejection.
Raab writes:
"Prof. Madelung was right. Several moths crashed because of broken wings." Prof. Madelung wrote to Raab on January 8, 1970:
"I remember... it was about a disagreement between your company and the DLV about testing the airworthiness of an aircraft. We had a fight, but that was a long time ago . . . The fight was because of the MOTH." Raab landed a Moth in Richmond Park in the middle of London with chief engineer Gammelin as a passenger. After the police had cleared a narrow runway from the thousands of curious onlookers, he took off with the wings hanging at an angle, through the rows of trees, and landed again in Croydon.