I have about finished a new LH RC and mounted a Cyclon .061 on it.

The plane is 9 ounces with a Hitec 555, two HS-55s, and a 50MaH battery.

The engine is turning an APC 4.2 X 4 34,800 with peaks at 35,000. 35,000 calculates to 139 MPH, disregarding airframe drag and prop efficiency.

So we are going to lose a few MPH there, but if the 4.2X4 unloads in the air, the engine is going to be turning a few more RPM too.

I'm fairly sure I can fly these things at, maybe, 90MPH. The other 30 or 40 MPH may be a bit problematic.

I best start with an APC 6 X 2.