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Kliff,

The Fox .36's of the combat type engine are the ones that had the squared intakes. The one in the picture, if it does not have "29" stamped on either the top or the bottom (I've seen the stamped mark in both places.) of the bypass side mounting lug, is what Fox sold as the .36 Stunt in the mid to late 1970's. I have three of them and the two that I've flown have had decent power, although not much more than the Fox .35. This was at a weight penalty over the .35 as well. It has been my experience that the .36's did well in somewhat overweight or "draggy" profiles with not so much of the famous Fox "burp" as the .35 has when mounted in the standard profile plane configuration.

They were (are) a good match for a kit built .29 to .40 size Midwest Warbird in my experience. They will do the 4-2-4 dance, but not as well as a properly run Fox .35. I finally gave up on trying to get the engine to perform like a Fox .35 and set the needle for a slow 2 cycle and adjusted airspeed and power with prop pitch. They are like the Fox .35, an iron piston/steel sleeve engine that requires a healthy dose of lubricant in the fuel, at least 25%, most, if not all (preferably), of which should be castor oil.