Cool,
Just a few questions and comments regarding the thrust/climb speed calculations:
Considering all the planes in AH hace constant speed drives, i would believe that your propeller efficiency curve a bit wrong. The thrust of a constant speed drive propeller is in general relatively independant of aircraft velocity, although designed to have a maximum at some point (with real values of max speed and max climb or static thrust, you will have a good idea). Also i don't understand why you include the propeller efficency curve also in the excess power calculations when you already have included it in the thrust calculations?, or maybe i have missed something?