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

Paul, have you ever looked at the oiling system and the bearings and crank.
They used ball/roller bearings and some engines used a multi piece shaft.
Royce

Yep. Those old radials were very interesting.

Paul Lamar
 
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