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Al Shukle's Gilbert Erector-Built Heimlich In-Line 6 Aircraft Engine

Al writes: "[This is a] Prototype Heimlich zeppelin engine of 1915 on test stand. Separate cylinder in-line six with zero-lift underhead cam. Open crankcase with total-loss lubrication betrays steam engine antecedents. Single ignition system an obvious weakness. Manual cranking gear provided for emergency starting. Requires some effort on part of crewmember."