RE: McCoy engines
You are one of the VERY FEW that actually had good luck with Testors engines. Like I said, if you go back and look at the results of all the National Model Airplane contests in old Model Airplane news magazine, you will never see any McCoy engines listed in the contestant write ups. Some of the Juniors used them but never won anything. An example: In the 1962 Nats in AMA combat, ALL 9 places in the three categories (junior, Senior, and open) were won by Johnson combat specials or Ball bearings and Fox took most of the stunt events. K&B and Veco were the winners in R/C. The only events won by ANY McCoy engine was class C control line speed and that was the old ball bearing 60. When the cheap 35 and 29 were selling for $5.95 and the 19 for $4.95, The 60 was going for $40.00. Does that say anything. Also think about this. The little Cox Babe Bee 049 was selling for $3.95 then and the TD049 was selling for $6.95, a buck more than the testors McCoy 35.
Even the engine designers and writers considered the Testors McCoys little more than junk.
I still have a box of them in my basement. They start easier with an electric starter but don't put out half of what a good Johnson, Fox or Super Tiger does.