Already by the late 1930s he was an authority on aerodynamics, working at the German Institute of Aeronautics in Berlin, and holding patents for important innovations related to aircraft, such as landing flaps.
[citation needed] Kramer had a wide range of interests and his work encompassed automobiles, gliders, propeller noise, acoustic missile and wake tracking, and underwater coatings.
This bomb was deployed a number of times in late 1943 and early 1944, achieving several successes before Allied air superiority and electronic countermeasures rendered it ineffective.
One direction of research was to improve the ability of this weapon to penetrate the heavy armor of modern battleships of the British King George V and the American North Carolina classes.
[citation needed] Kramer left government employment in 1952 to take a position as Technical Director with Coleman Engineering Company where his work focused on the highly efficient movement of structures through fluids via creation of laminar flows.
However, he had been researching laminar-flow issues long before he came to the U.S. After ten years of effort he discovered that a compliant coating, such as the skin of a dolphin would dampen any turbulent tendencies resulting from movement through water.