Hi Bill, You may remember that Willis Swindell built the prototype for this model and flew it very in the mid'90's. His engine at that time was the K&B .40 ABC especially tuned for Stunt. He and Mike Garmon came up to Brodak's that fall '97 and my flying buddy and I were invited to come down for a happy session of flying in John's backyard! Willis also had an olive drab P-51 powered by a four stroke which flew quite well. At the end of that magic day Willis gave me that plane and I have proceeded to fly it off and on eversince! I have had many engines on that air frame over the past 16 years! The most recent is an LA .46 which I think has been the best combination to date.
Conservatively speaking I know that I have over 600 documented flights on it not all without incident! I have replaced the horizontal stab, part of the rudder and several ribs in that span of time! Willis did add at least one rib bay to each side so it's not exactly stock but quite close. In my time it's had: K&B .40 as with Willis', FP .40; OS.48 4C, OS 40 4C Surpass and pre-Surpass, one of the first Brodak .40's ever sold! John brought his first shipment up to one of my Fly Ins and sold all he had brought! The plane flew well with this engine!