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Stelzer engine
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<h2 id="operation">Operation</h2> <p>There are two <a href="/facts/Combustion_chamber/FNqjDrN8">combustion chambers</a> and a central precompression chamber. Control of the air flow between the precompression chamber and the combustion chambers is made by stepped piston rods. </p> <h2 id="applications">Applications</h2> <p>Applications envisaged for the engine include driving: </p> <ul><li>An <a href="/facts/Air_compressor/wclAqCt2">air compressor</a></li> <li>A <a href="/facts/Hydraulic_pump/EVxec5gu">hydraulic pump</a></li> <li>A <a href="/facts/Linear_generator/kJW7MfSY">linear generator</a></li></ul> <h2 id="prototypes">Prototypes</h2> <p>A prototype engine was demonstrated in <a href="/facts/Frankfurt/Pw4Xj9A4">Frankfurt</a> in 1983 and <a href="/facts/Opel/hFsySxoa">Opel</a> was reported to be interested in it. In 1982, the Government of Ireland agreed to pay half the cost of a factory at <a href="/facts/Shannon_Airport/hp96MDe7">Shannon Airport</a> to manufacture the engines. <a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> A prototype car with a Stelzer engine and electric transmission was shown at a German motor show in 1983.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Linear_alternator/kJW7MfSY">Linear alternator</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://patents.google.com/patent/US4385597">U.S. patent 4,385,597</a> -- <i>Two-Stroke Internal Combustion Engine 1983</i></li> <li><a href="http://www.freikolben.ch/37401/109985.html">Diagrams of Stelzer engine and linear alternator</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Taglilabue, John (1983-06-27). "Free-Piston Engine Debated". The New York Times. <a href="https://www.nytimes.com/1983/06/27/business/free-piston-engine-debated.html" target="_blank">https://www.nytimes.com/1983/06/27/business/free-piston-engine-debated.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Popular Mechanics, March 1984 <a href="https://books.google.com/books?id=FeMDAAAAMBAJ&dq=stelzer+engine&pg=PA62" target="_blank">https://books.google.com/books?id=FeMDAAAAMBAJ&dq=stelzer+engine&pg=PA62</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>