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During 1940's WW2, Hungarian scientist emigrated to US to keep his invention from the German Nazi war machine. After several years, he revealed data about his conversion of prop plane engine to run on water tank. Steam generator from exhaust heat formed vapors in chamber with SS screens for electrodes. Certain setting Tesla coil was applied , so as efficient hydrogen and oxygen fuel gases were generated and operated the engine. Is there someone knowledgeable to design circuit and parts for high voltage Mhtz oscillator ? Is quarter wave secondary coil neccessary? Narrow, short, gray type high temperature PVC tube with #30 magnet wire, for about 15KV. See- The Hefferlin manuscript. On line , or back issue Sept 1946 Amazing Stories Magazine.