http://www.craftsmanshipmuseum.com/KnappCol.htm

Check out item #123, a 6" rotary engine

Robin F Berglund

Heck you can buy several rotary model aircraft engines.
http://www.osengines.com/history.html
ww.ebay.com/sch/i.html?_nkw=wankel+engine

Paul Lamar

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