Have you found any pinions that will work? I haven't had any luck in that area. I've heard it's a weird pitch or something.

I'm running a BL tail motor. It's an [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXLWW3&P=0]Ammo 12-30-4110[/link], but I meant to actually get an [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXLWW2&P=0]Ammo 12-30-3850[/link]. The 4110 has alot of power. I'm sure they both do. I'm using it with a GY240 and as long as the T/R is going before the main blades she doesn't spin, but if the main motor starts first the surge from the gyro causes the tail to kick. I figured the kick would be a little less with the 3850. The tail now has a ridiculous amount of power though.

I've noticed with my 3400Kv BL the headspeed has increased quite a bit. Before with the OE motor the blades would stall at about 7/8 throttle, now with the increased headspeed it doesn't even stall. The problem is that drag increases exponentially so the head speed is drawing some amps, plus that extra torque has the T/R working harder. My run times decreased by about a minute or so with this set-up. I know a computerized radio would go a long way toward optimizing the Axe with a BL motor, but I know I still need to get the headspeed close.