r william,

I've got two Axe "daily fliers". One stock and one with a C12 and GY240. I use Helimax lipo protection modules on both and always fly (absent a crash) until the LPM cuts the gas.

I fly without training gear and no vertical fin on either heli.

For awhile (until the battery quit) I was checking the temps of the tail motor, main motor and battery after each flite, using a Duratrax Flashpoint IR remote thermo.

Allowing for variations, on my fully stock heli, with 15-30 flites on the main motor, the main motor temp would be about 250f. My Gy240 heli with 170-185 flites on the main motor would be about 350f.

After putting a new main motor on the GY240 heli, main motor temps fell about 50 degrees, to around 300f.

I attribute the increased temps on the GY240 heli to the increased weight, due to the gyro and C12.

Possibly the reason hi-time motors run hotter is due to increased resistance from the brushes to the commutator and increased friction due to worn bushings (what else is there?).

I found a web site, 24hourbatteries, that sells 10 cr2032's for $7.99, including shipping and handling. I ordered 10 yesterday, so I'll soon have my thermo running again. I'm hoping the chart the change in temps as the motors, tail and main, age. I'm also curious to see if the battery temps stay constant.

Finally, I think my next main motor is going to be the 380x offered by xtreme. It has ball bearings and replaceable carbon brushes for under $20.