Well, guys, after considerable thought (I don't DO that too often) I have decided to go with the O.S. 55AX; plenty of power for the design, I have built the framework light, can use a smaller prop, the engine weighs less with the O.S. metal motor mount I'm using and the tank for it is reasonable and fits nicely in the compartment.

You have all offered some good thoughts and comments on the selection but I believe the O.S. 75AX will be a better fit for the plan build FlyBaby (RCM plan) that I also have on the "board". Thanks for taking the time to present your thoughts.

Soft landings.