Also......what you are talking about in your last mail is the efficiency of the prop............what I am talking about is extracting the max aerobatic potential from the engine...........the best rpm for the engine to run at in its max load condition. (given noise considerations.....yada yada).

what device you need to put on the front of the engine to satisfy the above is the second consideration.........as long as what you put on the front is as EFFICIENT as you can get and meets the above your in good shape...........a prop does nothing but convert horse power into thrust........an efficient prop IS an efficient prop and an inefficient prop is...............
Of course as all of our airframes are soo much alike that "matching the prop to the airframe" is meaningless.............and personally........I STILL want MAX thrust via the most EFFICIENT prop at the OPTIMUM rpm for the engine in the MAX LOAD condition............see where Im at?

Kindest regards Ian