Electric Tails seem to be the bone contention...I am not experienced but can imagine from the MSR what a larger version manifests in problems...
There evidently are mods ALREADYout there...Irefer to http://www.electric-rc-helicopter.co...pic.php?p=9447
I like what this guy has done, and imagine it will be cheaper (and more stable) than replacing 10 dollar motors every few weeks.
The electrics allow only a tail servo (currently a Futaba S3114 analoge) to be added. Simply unplug the tail motor, unplug the signal plug from the gyro to the esc, and plug in th new servo.
Mechanically: a custom made alloy belt pulley and retainer for the main gear, spacer to drop the main gear slightly, an idler block for two flanged bearings to guide the belt down the stock boom, custom made belt, and a complete Skyartec tail unit (currently metal, will try plastic when I have more parts).
I adjusted the servo push rods (about two full turns each) to compensate to the main gear spacer, which lowered the head about 1mm.
It is totaly reversable with only three 2mm holes drilled into the heli. No other modification required.
Total weight, including battery, 370 grams.
Flight testing is continuing and hope to have some data (amp draw, flight time ect) and video this week.
Tail holds well and is precise. Flys best on idle up or flight mode 1 (higher head speed). I guess with a digital servo (the stock gyro has digital output) it will work best.
Like the rest of the heli, the tail responds nicely to stick moments and will suit the begginer."
That's the way Eflite should have made it, me thinks