RE: .061-.074 COMBAT
The AME is probably the strongest .061 you can get [for the money], but it needs to be run on bladder. The fuel consumption is high, so 2ozs seems to go through it in about 5 minutes. The crank can be chucked in a drill motor, and a slight relieving of the main shaft 1/8" from either end will reduce rotational friction. Use 600, then 1000 grit. The BIG MIG and AP .061s are my favorite, with a 6-3 prop the action is slow enough to avoid mid airs, but lively. The glowheads all interchange between COX, NORVEL and AP. The only way to inspire interest is to demonstrate. My son and I have been averaging 30 sorties per week [300 combat minutes] for the last month and have had to repair 12 plane fatalities that took anywhere from 1/2-1 hour to complete. At 2 ozs of fuel per plane, per sortie, that works out to 1 gallon of fuel, 2 rolls of crepe paper and 2 glow plugs per week.