If the McCoy runs well on the bench, there is no reason to think it won't run on the airplane. I would advise that you use fuel with at least 20% oil, and at least half of that castor. The same advice applies to the Fox .36. Sig red fuels are 20%, 1/2 Klotz, 1/2 Castor. They also make an all-castor blend in 20 and 25 percent. If you must use one of the low oil RC fuels, add castor to it.