I have an Ultra Stick 120 with a Saito 150. This combo flies really nice and has great vertical performance but I am wanting to try a gas engine. I would like something that would give at least the performance of the Saito but is more economical to run. Has anyone used a gas engine on this plane? If so, what installation problems did you run in to?

Boy, I would think the extra weight of the gas engine would kill the perfomance of that plane. Course, everyone told me a US 41 CC engine wouldn't work in a Dynaflight PT-19 and I did it and it is amazing. Check the weight diff and the HP diff and see what they are. should be able to get the US info from tower and the saito info from horizons site.

I've never actually seen that airplane fly with a Saito 150. I have seen it with an OS FX 1.60 -- AWESOME, a Saito FA-180 -- NO COMPLAINTS, a Moki 180 -- IN ORBIT, and a Zenoah G-23 -- GOOD PERFORMANCE.

Based on my experience and taking expense into consideration, your best bet for a gas engine in this airplane is the new Zenoah G-26.

There are others out there that will blow the walls off the Zenoah with the same weight cost but also at a more significant wallet cost. Another concern you have is that with the stock landing gear you are constrained by your prop size. Even with a 16" prop you need to be carefull with your takeoffs and landings on grass. The G-26 recommends the 16" prop. With larger and/or more powerfull gas engines you need to look at larger props. You can move up to an 18" prop if you invest in the TnT replacement gear.

I have one that I was going to use the homey 45cc but i have not started to build it. I want to make it into a low wing plane .