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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Quite simply, the rotary engines do a poor job of capturing the bang (of fuel an air). Many people latch on to the 'air pump' simplities that the rotary has, and don't consider capturing the work of the fuel.
THe weight savings of the simple small engine are generally offset by the extra weight of extra fuel. Unless you are using it for short sprints (autocross) ... tho' at that point, why not just go electric?
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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