Test flew mine today with the YS1.40 and yes, it is way overpowered! Even here in the Mile High City it will hover at about 30-35% throttle. The instructions are correct when they say it will not sit still on the runway at idle with a 1.20. It has no bad habits and although I was carefull with the throttle, a few passes (quick) at full throllte showed no flutter and everthing is still in one piece. The rudder is extremly powerful but everything else seems well balanced although I am nose heavy. I am running a 16X8 prop which pulls well but it is hard to slow down for landing. More tests soon with some different props and with the cg moved back, I'll report back. This plane is a hell of a bargin and flies well, however a .90 YS would be my pick for a power plant if I had it to do over.

Rob