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Stelzer engine
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<p>The Stelzer engine is a <a href="/facts/Two-stroke/Al4uUeo9">two-stroke</a> opposing-piston <a href="/facts/Free-piston_engine/tB9DhMJ8">free-piston engine</a> design proposed by Frank Stelzer. It uses conjoined <a href="/facts/Piston/z7pN46u7">pistons</a> 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 <a href="/facts/Mechanix_Illustrated/9RrRwscA">Mechanix Illustrated</a> magazine. </p>