Just a plug for the little Surpass .26, I love mine; after several hundred flights and a few crashes (it's on its third plane) it is better than ever. Compression is absolutely perfect, and it has no problem hauling my 3lb. Astro around, maybe not quite unlimited vertical with a Zinger 10X6 but close enough for me. I fly on the wing anyhow, so usually 1/3 to 1/2 throttle does just fine. Also very quiet, at low throttle it really purrs like a kitten. Starts first flip every time and with a 150cc tank I have to worry about the battery long before fuel is a problem. Amazing little engine.