Bill, I converted my Angel S to IC power, after flying it for two years with the recommended Hacker set-up, and I am very pleased. I now have a Y.S. 63 installed with a Hyde soft mount and a Hatori muffler and header. This is a very quiet and powerful combination and performs much better than the electric version. I had to experiment with props and ended up with an APC 13X6. The performance is outstanding and I enjoy flying the Angel more than ever. I'm using a 10 oz. tank mounted on the CG, and a 10 minute flight only uses a little more than half a tank of fuel. For the receiver pack, I'm using the new Hobbico 1100 mah Life pack. A 10 minute flight drains about 50-60 mah. so no worries there. I use the Angel S to practice the intermedite sequence and it makes for a very economical practice plane.....RS