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

Al writes: "The Heimlich rotary was an odd engine in a category renowned for oddities. [Rotary engines while looking like the later, more common radial, had a fixed crankshaft around which the cylinders, crankcase and attached propeller rotated.] The Heimlich was the only single bank rotary with an even number of cylinders, resulting in heavy vibration from the irregular firing order. Of its performance, the less said, the better. [Movie with front crankcase cover removed show master rod (black tape) and action of link connecting rods.]"