Dan, Perhaps you could post the engine, propeller type, length and pitch and intended gross weight on the forum and that would help us give you some guidelines.
I don't think performance data was researched and published for the C model Coupes. I made one excursion through Wyoming with a C-85 at about 1350 lb. gross weight with an extreme climb propeller (7146 McCauley). With the engine leaned before takeoff, I got off the ground at the 1/3rd mark of each high altitude runway. Climbing after getting off was another issue. The downdrafts from the summer thermals after 10:30 a.m. dwarfed my climb rate. I had to look for a hot spot on the ground, fly over to it (low level) and circle in the enormous updraft. Before 10:30 a.m., the flying was the best I've ever had! (Limited experience, limited answer - but the best information I've got.) Ed Ed Burkhead http://edburkhead.com/Ercoupe/index.htm East Peoria, Illinois ed -at- edbur???khead.??com (remove the ? marks and change -at- to @)
