Harry, I have 2 of these engines and have flown both. One is an earlier one, beautifully polished crankcase, piston port induction (side carb). This is called a Model B Wolf Predator. It is the lighter of the 2. Both are in the G23 weight class, more or less, but are way more powerful. The second engine is the latter one, a rear induction RI version that came with aluminum standoffs. It is not as highly polished as the first but still quite nice. It's in a BalsaNova 120. Both swing 19x8 props nicely, approx 7100 rpm+ prior to break in. These were made by AJ Engineering, up in Wisconsin, up until approx 1-1/2 to 2 years ago. They were nearly as expensive as DA50's (maybe $50 less) but came with a nice muffler. I don't think the price made sense, but you can tell a lot of work went into it. AJ Engineering stopped producing them after approx 250 were made, as I recall, because he was unable to obtain the Homelite jugs any longer. The RI is a little easier to start, and the carb is fitted with a choke plate. It supposedly was a bit more powerful than the Piston port version, but I didn't observe this on my test stand. The piston port version has a standard G23 style carb.

I have 4 mufflers for my 2 engines. The early Model B has a CNC machined muffler, that is beautiful, but is essentially a diverter style, and incredibly loud. The RI came with a narrow wraparound pitts style, aimed at warbirds, since the engine profile is narrow with the rear carb. I also have a wider wrap around. Last is an inverted Pitts muffler that Bisson made for me. Bisson has the needed dimensions so if you were to need any kind of muffler, Bisson would likely be able to take care of you.

Good luck with your prize!!