I'm building a scratch design fun-fly plane that our club originally designed years ago to be used for pylon racing. It turned out that the plane was so easy to fly, everybody forgot about racing them and just flew them for fun. We also found that by increasing the size of the aileron and elevator that this little plane became a real potent aerobat. Most everyone bakc then put k&B .28s on them because that was the cheapest way to go.

The plane weighs between 3 - 3.5 lbs with a 42" wingspan. The original used a foam wing, but I'm trying thus one with a built up one, which should save a little weight.

I don't think the K&B .28 is available anymore, so I was looking for something else. There seems to be a lot of good engines on the market now that would offer a lot of bang for the buck. I'm specifically looking at the TT pro 36 or similar size and weight. Any comments on this or similar size engines?

Also, I've seen posts from some saying they switched their TT GP42s for TT pro 36 and gained a lot of power. Is this true? Also, how does the OS 40 LA compare to the TT 32 pro?

Thanks,