RE: McCoy 35
I had a half dozen of these over the years.
I think it was closer to the fall of '57 before I saw one and I bought it.
My next ones were from '69
After about 1970 they more or less disappeared as McCoy was supposed to be bringing out the Series 21.
I never wore one out nor did I ever see any appreciable wear in one. But, I never had one run away in a lean run either.
They were an excellent control line stunt engine. Very reliable.
I had other brands also. The only engines that came close to being as good for control line stunt were the Fox 35 and the OS MAX S35. I had a McCoy 40 Stunt also but was not impressed.
I had the first Fox 40 Stunt like the one Earl has and it was very nice with the original Fox needle valve but all the magic was gone if you used a different needle valve.
I had several Super Tigers and they were bad about runaways on mixture but it didn't hurt them. The only ST good for stunt was the G21-46.
I had a Johnson Stunt Supreme that would tend to want to run away also.
The Merco Black Streak Stunt Special was a joke on my list.