The Stelzer engine is a two-stroke opposing-piston design proposed by Frank Stelzer. It uses conjoined pistons in a push-pull arrangement which allows for fewer moving parts and simplified manufacturing.
An engine of the same design appeared on the cover of the February 1969 issue of Mechanix Illustrated magazine.
- U.S. Patent 4,385,597 -- Two-Stroke Internal Combustion Engine 1983
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