Forgot to answer all the questions in one post.

No my plane is not for sale at this point in time.

When Skystar was in operation they had a 914 with a Hoffman constant speed prop that they used as one of the demonstartors. I think the plane belonged to one of the principals of the company and may have been leased to Skystar for purposes of demonstrations.

That being said, they flew that airplane a fair amount and used it for a test bed as well. However, I don't know if they conducted a head to head test with the 912s. Maybe some one in the community knows more specific info regarding that particular plane and any specific testing that might have been done.

As you might know about my history (part of the EAA 103 builders group that built 13 S7 kitfoxes where we installed 9-912S engines, 1 Rolls (0-200) and 3-914 engines), this has given us a some practical comparison of the flying characteristics of the 912S and the 914. But we did not make any attempt to do a head to head compare.

Again, hope this helps.