Okay ... I got a WM Super Chipmunk ... its rated for 60 2C and 90 4C ... I went with a ST G90 ... its cheaper than a 90 4C and over this weekend I learnt why there is a need to over power a plane. The extra power is not just about speed but my Chippie can pull nearly unlimited verticals and knife edges are a breeze. The extra power is a must! I can throw a 15x4 prop and with that I will have all the torque I need.

The G90 is an interesting engine ... not a real screamer, only getting 10,500 RPM on a MA Scimitar 13x6 ... most reliable and she will flip start all the time. Also ... its cheap.