To complete ones education on the advantages of the rotary engine 
one must study the history of the aircraft piston engine.

This is a very concise history of the the aircraft engine
you can download.

www.enginehistory.org/OX5to3350.pdf 

I found it interesting that later models of the R3350 turbo compound
engine gave up to 3000 hours of service in airline use.

Early non-turbo compound versions used in the B29 were lucky to get 100 hours.

Paul Lamar
 
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