I have a G-45 on a Sig Suhkoi, and have had a ball with it for two seasons of flying. I mostly sport fly and enjoy tumbling around; for this the Zenoah engines are great. For 3D,etc maybe you need the more expensive engines. I also have a G-38 on a Texas Hurricane, and a G-62 on a laser 2000. You can't beat these engines for overall sport flying, and cost........John