Jellyson
Posts: 920
Joined: 11/5/2006
From: Toronto,
ON, CANADA
Status: offline
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I got the Heli-Max MX400Pro and am loving it, except that the spares and bling are far more costly than the TRex stuff, and I seem to be converting it to TRex so I'm calling it a Heli-Rex T-Max 420. Longer carbon tailboom, 325mm TRex blades, Trex SE tail rotor hub&grips, etc.
I got it originally because of the aluminum frame, low price and some metal in the head. (The heli's, I mean, not mine.) If Align had the SA with an all-metal rotor head, that's what I'd get if I were to do it again.
for Mato:
As far as setup goes, the ARK400 in the pix isn't eCCPM but mechanical CCPM like mine. You can download the MX400Pro manual from the HeliMax website and it gives useful info about setup that will apply to your ARK400. Be sure to get the mechanical CCPM version, not the eCCPM.
Be sure your transmitter isn't trying to use eCCPM for this helicopter! It has a separate pitch servo! Of course you know that! I just love to re-state the obvious! With exclamations!
The book says use -8 to +8 pitch but I'm using -10 to +10 because I wanted a slower head speed for hover indoors.
Plug the gyro gain lead into the sixth channel of the receiver, put that channel on one of the toggle switches on the TX and use the travel adjustment in the TX to set the gain. Usually negative values are for the SR mode and positive values are for the Head Hold mode. Use a tail-boom servo mount so it will be easy to make small mechanical trim adjustments by sliding the servo. Adjust the servo position trim (not the radio trim!) so that in SR mode you need zero flight trim to offset torque in a stable hover. Set the rudder sub-trim in the TX so that, in HH mode, the tail blade pitch doesn't drift, or drifts very slowly, from center after quick rudder stick deflections.
Start at 50% gain in HH mode. Increase the gain a little at a time until the tail twitches back and forth after quick rudder deflections, then back it off a hair. Mine is at 67 percent, with +7 points of rudder sub-trim, and will hover hands-off in SR mode with zero flight rudder trim.
You should be able to fly at hover in SR mode with little or no rudder flight trim (ideally none) and in HH mode you should need no trim. It may be necessary to add a bit of trim as the battery voltage decays during flight.
And it is hightly recommended that you get the metal rotor hub to replace the plastic piece on your heli. You don't need the whole head, but the plastic hub is known to be a weak point on these helis.
Entropy's setup sounds good to me. I'm using Spektrum DX6, 4 HiTec HS65 servos, Align gyro, and the stock HeliMax 2580 kv motor and 30A esc. The HS65 is plenty fast and strong for my tailfeathers and works well with the Align gyro. Did the first flight with TRex 325 mm main blades today (they do need shims to fit the MX blade grips). A noticeable difference--quieter and seemingly more powerful, but more scary too as I cannot see the dark-colored blade tips at all.
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The helicopter is the only flying machine ever invented capable of crashing into _itself_.
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All Forums >> RC Helicopters >> Electric RC Helis >> RE: HeliMax MX400 CCPM heli "build" thread 
RE: HeliMax MX400 CCPM heli "build" thread - 
) is a great heli but I couldn´t find information on the setup........not like the T-rex 450....I have the SE version and I found great info on how to setup the gyro, the eCCPM, etc.....may be I need to look better in RC forums....... 