[] I have the Troublemaker short kit from Eureka. I bought it for SPA competition and when I looked at the size of the plane I determined that it wasn't really suitable for a .91 four stroke. It's a fairly small plane. I was going to extend the fuse even more but what it really needs is more wing and a wider fuse. I will be selling the short kit next week. I believe a modern .46 would be all the plane needs to fly well. I don't like noisy two-strokes so I won't build it. I really wish either the SPA would allow more planes into the stable because it is next to impossible to get what I really want. ie: Compensator, Phoenix etc. I will be curious to see how you make out with the kit. Keep us informed with text and pix. It should be a good flying plane but it's just too small for me. Good luck. Skip