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Al Shukle's Gilbert Erector-Built Heimlich Radial Aircraft Engine

Al writes: "In a final attempt to manufacture a viable product, Heimlich tried to convert the previous rotary design into a radial. The lack of sufficient cooling fins on the now stationary cylinders doomed the project to failure. If outside air temperatures were warmer than -55 degrees C, i.e. at less than 35,000 feet altitude or beyond 90 miles from the North Pole, the engine quickly overheated, lost power and seized. [Movie with front crankcase cover removed shows relative motion of master rod (black tape) and link connecting rods. Compare to similar rotary movie.]"