Rusty, I read both articles and the facts presented were the same but the prose was completely different.  I had no problem with the fact that Ken Scott of Van's AC wrote the article.  As written, it was as objective as possible with the exception of the false FADEC claims on the Powersport system.  BUT, That artificial rule on the prop RPM during the cruise fuel burn test was absolutely absurd.   To have any real meaning, the engine should have been run where it operated most efficiently which in this case was at much lower RPM.

 

Also not mentioned in the article was the fact (based on Van's Aircraft own tests) that the 3 blade MT props used on the Powersport rotaries are significantly less efficient than the 2 blade blended airfoil Hartzel  props used on the Lyc powered planes.

 

These factors clearly stacked the deck against the rotaries when it came to fuel economy.  They should have at least mentioned the improved exhaust system that the Powersport engines now run. 

 

Tracy