If you're going to buy the MX 400 helicopter, then here's a couple tips for you.

Buy the upgraded (metal) center hub right away. The 'plastic' center hub is so cheap, it breaks if you start the motor too fast. (see my rant at the end of post)

Point two, related to above. Buy an ESC with a governor mode to control the rotor spin up and 'under load' rotations. (Castle Creations Phoenix 35 for ex)

If you want a cheap solution for servos, but the EFlite S75 servos. No one even comes close to the torque and light weight for $15.00

The HeliMax 6 pole motor is a really powerfull motor. You could easily overpower your heli with it, so start with a lower tooth count pinion and step up from there.


About the MX400, problems

This is the age we live in, where manufacturers know there are huge problems with things and do nothing to straighten them out. There is no possible way that HeliMax (Hobbico) could NOT know that this center hub problem exists. Oh yeah, there is one way, they never tested any of their helis...but we all know that's impossible.

Ok, so I've had this heli for a month, never flown it, but have replaced the center hub already. Why? because I accidentally hit the throttle with my hand when setting up the mixing. Oh, no, the heli didn't hit anything! the torque snapped the center hub.

Now, I've flown the heli. I've crashed it, and it was a head crash (tail is fine), so I want to buy a head crash kit. Only problem is, 1/2 the parts in there I don't need. I don't need a main shaft, I don't need a feathering spindle. No, I need all new linkages, a new swashplate (yes, that's right, it ripped the balls right out of it), basically all the plastic parts. (oh this is about $90 US)

Why? because the center hub broke, and everything torqued off from there. Believe me, if that part had held together, I would have been able to use the standard crash kit, and been just fine.

My advice, either buy the metal center hub for the MX400, or buy a T-Rex, either way, you're paying about the same. Otherwise, I'd stay away from this heli, no matter how well it flies, eventually you WILL crash it, and you know what happens after that.