also done some work on a navalized version of the design as Projekt 11; however, the additional weight of the landing equipment, or floats as in the 11b, dramatically reduced range and made the design unfeasible. Specifications (Ha 137 V4) See also References Notes Bibliography Green, William. Warplanes of the Third Reich. London: Macdonald and Jane's Publishers Ltd., 4th impression 1979, p. 70-71. . Wood, Tony and Gunston, Bill. Hitler's Luftwaffe: A pictorial history and technical encyclopedia of Hitler's air power in World War II. London: Salamander Books Ltd., 1977, p. 133. . Low-wing aircraft Single-engined tractor aircraft Inverted gull-wing aircraft 1930s German bomber aircraft Ha 137 Aircraft first flown in 1935