I think you just said that there can never be a new aviation piston engine because the test fleet would be too small.

Therefore, if you don't like the tested piston alternatives out there, you should be looking at a turbine?  (fuel specifics notwithstanding)

Colyn

 

Hmmmm....

 

"Never" is a very, very long time.  I suspect nothing much new in aircraft piston engines in the next decade or two which is the same as "never" for me.  It is just too painful and expensive for not much gain.  See Thielert's experience. 

 

In rationally asking  "which engine?" one has to concurrently ask "which mission?" and "at what price?"   

 

If it is an emotional decision, that's fine, nothing wrong with that (personal airplanes are mostly emotional), but recognize it as emotional, and do not try to rationalize. 

 

As for considering a turbine, if you remove money as a consideration, why not? 

 

Fearless Fred, emotionally attached to efficiency, reliability, and cost effectiveness (among many other things).