There are a couple of unusual differences in Ed airplane
as compared to both Tracy's and Jim's I forgot to mention.

Ed uses external mufflers and louvers on the side of
the cowling. This may add enough additional drag to
make up part of the differences in climb performance
between his airplane and the others. 

The oil radiator position has been changed since
this piture was taken by Ed last year.
Ed-Anderson-underneath.jpg

If I were Ed I would change the position of the muffler 
as one of the beauties of the rotary compared to a air 
cooled aircraft engines is its small width. Most of the 
side by side airplanes are wide and that is one of the 
reasons horizontal opposed aircraft engines became universal 
in the first place. IMHO the best place for the muffler
is right along side the engine with a side exhaust
system. The drawing on the ACRE NL web site of
the RV6 motor mount illustrates this advantage.

The two to three hundread RPM difference compared to Jim's
could also be significant because as I recall someone
mentioned that the prop load was proportional to
the fourth power of the RPM.

Paul Lamar
 
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