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    RE: HeliMax MX400 CCPM heli "build" thread - 12/8/2006 6:59 AM   
    Jellyson



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    Status: offline     		Hmm--this is what I would try, mato. The gyro gain lead plugs in to the receiver just like a servo. Those of us with TXs that have negative values can use negative for SR mode and positive for HH mode. THis is like driving a servo to the right, or to the left. Or something, you know what I mean. So your transmitter, I think, can drive a servo like this: zero percent, servo is at the leftmost position. 50 percent, servo is centered, 100 percent servo is at the rightmost position. So for the gyro, the left travel limit will be the SR mode gain, and the right travel limit will be the HH mode gain (or the other way around, you know what I mean). So you program the TX to put this channel on one of the switches, with the travel limits set at your desired gain in each mode.
    I think.

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    < Message edited by Jellyson -- 12/8/2006 7:03 AM >

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    RE: HeliMax MX400 CCPM heli "build" thread - 12/8/2006 7:12 AM   
    Jellyson



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    Status: offline     		Oh yeah If I am right about the above gyro setup, then "50 percent gain in SR mode" in the gyro instructions would be 25% on your TX travel limit, and "50 percent gain in HH mode" would be 75% on your TX travel limit. 100 percent gyro gain would be zero percent servo travel ( SR ) and 100 percent servo travel (HH). 50 percent servo travel would disable the gyro (gains at zero, if it was a servo it would be centered).
    Or the other way around left and right, you know.
    I think.


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    RE: HeliMax MX400 CCPM heli "build" thread - 12/8/2006 7:16 AM   
    Mato



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    Status: offline     		yes, I understand you . I put it like this, tomorrow I will make a test flight.

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    RE: HeliMax MX400 CCPM heli "build" thread - 12/8/2006 7:30 AM   
    Jellyson



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    Status: offline     		Yeah, that looks good, as a place to start. Now to figure out which mode is which! You should be able to tell right away: in HH mode you won't need any flight trim if the system is working well, but unless you are very lucky in your setup, in SR mode it will need rudder trim, until you can adjust your servo on the tailboom. Be really careful switching from one mode to the other in flight (in fact--don't do it in flight) until you have the rudder linkage and servo position set up so that you also need no trim in SR mode.
    Go carefully, my friend...


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    RE: HeliMax MX400 CCPM heli "build" thread - 12/8/2006 8:57 PM   
    Jellyson



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    Status: offline     		Oh yeah #2
    Mato, with the gyro I think you should set the "rudder" travel limits to 0 and 100 percent to start with--the gyro will take over and push the rudder (tail pitch) wherever it needs to.
    Then, you can back off the rudder travel if your tail slider is binding, but this will reduce the gyro responsiveness too. I just have my rudder set at full travel, and the pushrod will flex a bit if I really goose the rudder while the blades are turning slow.
    It isn't a problem in flight.
    .


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    RE: HeliMax MX400 CCPM heli "build" thread - 12/9/2006 11:16 PM   
    Mato



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    Status: offline     		well...today I did the flight test and I manage to trim the heli. The heli is very unstable and now the gyro works fine, I think . I am thinking of selling the heli because I thought that it would be a lot more stable than the T-rex SE but I was wrong. Compared to the T-rex this heli is crap(sorry to all the MX400 fans ). Anyway, thanks to Jellyson and all the people that help me with the setup of the heli. Mato.

    BTW, next challenge......Picco Z

    < Message edited by Mato -- 12/9/2006 11:20 PM >

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    RE: HeliMax MX400 CCPM heli "build" thread - 12/10/2006 4:59 AM   
    Jellyson



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    Status: offline     		How come so unstable?
    Well, mine isn't an ARK but the MX400Pro, maybe the components are better, but mine seems very stable to me, yet maneuverable too. Maybe you have something loose in the head (the Heli's, not Mato's! ) or a bad elevator linkage or something.
    Sorry you are disappointed with your heli, I wish you could fly mine, you might change your mind.

    Of course I'm going to get a TRex SA too, as soon as payday rolls around...

    Oh, what blades are you using? I put TRex 315's on mine and it made it more stable and look better too...
    (shims are needed)

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    RE: HeliMax MX400 CCPM heli "build" thread - 12/10/2006 6:32 AM   
    Mato



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    Status: offline     		Hi, the blades are the ones that came with the heli. This is a second hand heli, the guy from who I bought it said to me that the heli was new, that he didn´t flew it and yet he put it together. I start to think that he sell the heli because something was wrong with it. Tomorrow I will make a test with my T-rex 325mm blades .

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    RE: HeliMax MX400 CCPM heli "build" thread - 12/10/2006 6:37 AM   
    Mato



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    quote:

    ORIGINAL: Jellyson
    Maybe you have something loose in the head (the Heli's, not Mato's! )


    BTW, don´t worry I think I have something loose in my head...

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    RE: HeliMax MX400 CCPM heli "build" thread - 12/10/2006 6:55 AM   
    Jellyson



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    Status: offline     		Mato, here's a trick that made mine a bit more responsive and less "sloppy": you can "pre-load" the cyclic linkages to take away some of the play in the elevator and aileron. On our mechanical ccpm helis the swashplate is almost supported by the two aileron pushrods on the sides, and the two elevator pushrods front and back. So you can lengthen the two elevator rods one turn, and shorten the two aileron rods one turn, and you "catch" the swashplate in their grip, if that makes sense. This removed all play in the aileron and elevator for me. Also the swashplate rod was very tight in the anti-rotation bracket and the elevator had to work really hard against this tightness. A little sandpaper here helped a lot.
    Don't give up yet on this heli, I know it can be a good one!



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    RE: HeliMax MX400 CCPM heli "build" thread - 12/10/2006 7:17 AM   
    Mato



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    Status: offline     		Hey!, thanks for the tips! when I said that "this heli is crap" I mean mine only.........I saw that many other users are really happy with the heli like you, I was only referring to my T-rex and my X400. I hate to give up on something but this heli is driving me crazy!! . Hope that tomorrow the heli´s performance change a little bit with the T-rex 325 blades....

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    RE: HeliMax MX400 CCPM heli "build" thread - 1/19/2007 10:27 PM   
    soop7667



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    Status: offline     		Well - I don't know if anyone's going to read this or not seeing as though the last posting was in early December - however - I bought an MX400 a few days back...It was the basic kit, all plastic head parts and what not - I picked it up for $100. - pretty sweet price if you ask me. I got a CP Pro for christmas and it was my firsst RC Heli. Talk about having a hell of a time learning how to fly! It took me 4 days and 3-4 sets of main rotors to get it off the ground. Either way - After 2 weeks I could hover it fairly well - still twitchy and jujmpy, but still stayed airborn for the most part - the most trouble I've had recently was the tail not holding in windy conditions. Either way - I've burnt up my 3in1 and then I just had it...Thats when I bought the MX400 - My Set up as follows -

    MX400, Spektrum DX7, 3 E-Flite servo's, 1 Futaba Servo for the tail rotor, Align 430 L Outrunner and the compatble Align ESC - (Can't see the model number on it) - E-Flight G90 Heading Hold Gyro

    This was my first RC build of any kind. I had the majority of it done in the first night I had it all. The next day I attempted flight - Spun it up, had to align my blades, tweak stuff, reverse my gyro - second attempt - got it off the ground, 3rd attempt after tweaking - it flew. I am amazed how I was able to put off this stuff in this bird and fly it - It is like a dream - I didn't really have anyproblems - just minor adjustments. The hard part was programming the remote - I had to figure all that out, but now I feel like pro - "Not in the flying dept.) I can't nose in, right side, or left side very well...buyt tail in I have down pat - I just wanted to thank everyone for posting all their prooblems here - I found that I had seen some of the same little problems on mine, like the elev. linkage slop - and it's funny I had the same fix for it - CA allwed to sure in the hole, then reattached with a nice snug fit - THANKS EVERYONE FOR YOUR TROUBLESHOOTING! My bird flies like a dream!

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    RE: HeliMax MX400 CCPM heli "build" thread - 1/20/2007 4:22 AM   
    NY Rebel


     

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    Status: offline     		soop7667,
    Nice to hear of your success with your first build. It's really great when things work out like they're supposed to.
    I know what you mean about programming the Tx, drove me insane the first time for my eCCPM heli.
    Good luck and happy landings.

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    RE: HeliMax MX400 CCPM heli "build" thread - 1/20/2007 10:53 PM   
    freestyle2000


     

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    quote:

    ORIGINAL: bdavison

    ...
    Id say you're average lifespan is about 3 seconds with a Trex or MX400 before its doing the dead chicken and spraying splinters all over the place.
    ...


    Which heli do you suggest me? I'm very capable with 3D profile planes.

    Thank you

    Freestyle2000


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    RE: HeliMax MX400 CCPM heli "build" thread - 9/8/2007 11:19 PM   
    squawk7700


     

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    Status: offline     		Wow, my first heli was a Exceed RC Eagle 50, then a Blade CP w/DX6.. Just got a MX400 and hooking up my DX6 to it. Anyway can you tell me what your settings are on your DX7 so I can start off somewhere in the ballpark? It would help a lot. Right now I'm waiting for a CC Phoneix 35 esc and I'll have everything I need to run it up. Also, did you have a reason for going to a different servo for your tail rotor? I know that you should run a faster and stronger servo for the tail rotor but I thought the Eflite S75 would work ok. Oh yeah, should the tail control travel the full length of the shaft and when you center the rudder does it slowly move to center or jump back to center?
    Obviously I'm new at belt drive tail control. Actually, I'm new to most RC Heli stuff.

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    RE: HeliMax MX400 CCPM heli "build" thread - 9/9/2007 4:34 AM   
    hobby_man


     

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    Status: offline     		why do u want the settings for the 7 when you have the 6??

    the dimension is a strong 1/8 of an inch

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    RE: HeliMax MX400 CCPM heli "build" thread - 9/9/2007 6:52 AM   
    squawk7700


     

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    Status: offline     		I guess I thought the DX6 and the DX7 would be fairly close in settings. Guess I was wrong then. Ok, anybody have a DX6 who would like to share their settings for their MX400?

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    RE: HeliMax MX400 CCPM heli "build" thread - 9/9/2007 7:44 AM   
    hobby_man


     

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    Status: offline     		DX6 THE 6 HAS 3 CURVES VS THE 7 HAS 5

    TLN 0
    T2N 85
    THN 85

    PLN 40
    P2N 85
    PHN 100

    CCP ON
    CP2 -52
    P3 +100
    CP6 +100

    LET ME KNOW IF YOU NEED MORE I CAN FILL OUT THE SPEC. SHEET IN THE BOOK AND SCAN IT

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    RE: HeliMax MX400 CCPM heli "build" thread - 9/13/2007 7:59 AM   
    squawk7700


     

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    Status: offline     		Thanks for all of the info. If it's not too much trouble I would like you to email your spec sheet. Thanks

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    RE: HeliMax MX400 CCPM heli "build" thread - 9/13/2007 4:54 PM   
    hobby_man


     

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    quote:

    ORIGINAL: squawk7700

    Thanks for all of the info. If it's not too much trouble I would like you to email your spec sheet. Thanks

    I will get working on it

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    RE: HeliMax MX400 CCPM heli "build" thread - 11/25/2007 11:53 AM   
    electron



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    Status: offline     		I have been looking all over for a DX7 setup with the MX400 do you know of anywhere that one is listed.. I know I will have to tweak the settings but a known good flight proven setup is a great place to start..

    Here is my setup...

    MX400
    GY401
    3 HS-56BB Hitec
    High Speed Servo for the Tail
    2100 TP 11.1 pack
    Align 400L 2500K with 14t
    35 Amp ESC
    AR6100 receiver
    DX 7


    Thanks
    Electron

    < Message edited by electron -- 11/26/2007 2:04 AM >

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    RE: HeliMax MX400 CCPM heli "build" thread - 1/18/2008 7:15 AM   
    crashcrash


     

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    Status: offline     		Hey guys...I noted that the MX-400 comes with 180deg swash which is incompatable with the DX6 (120deg only). Soooooo, my question is to the DX6 settings. Are you running the 180deg or the 120deg swash? I bought the 120deg upgrade for mine as well as an aluminum head as recommended. Mine's not here yet so I don't have a clue except for what I've read to date. This ought to be a nightmare compared to the HoneyBee King v2 (LOL) but I needed to move onto the 400 class for a couple reasons (wind and poor eyesight). The HBKII is a 300 class and it gets pretty darned small at 100yds (orientation/vision).

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    RE: HeliMax MX400 CCPM heli "build" thread - 1/19/2008 11:01 PM   
    squawk7700


     

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    Status: offline     		In order to run your 120 degree swash plate you will have to install the eCCPM upper frame. The stock MX400 upper frame uses a mechanical CCPM to operate the 180 degree swash plate. You can use your DX6 with the 180 degree swash plate. It is not incompatible, you just have to make the adjustments.


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    RE: HeliMax MX400 CCPM heli "build" thread - 1/19/2008 11:15 PM   
    crashcrash


     

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    quote:

    ORIGINAL: squawk7700

    In order to run your 120 degree swash plate you will have to install the eCCPM upper frame. The stock MX400 upper frame uses a mechanical CCPM to operate the 180 degree swash plate. You can use your DX6 with the 180 degree swash plate. It is not incompatible, you just have to make the adjustments.



    Thanks. I ordered the 120deg CCPM upgrade which includes the upper assembly and all hardware. So now I have two uppers (doh!!!)

    The build is complete. I had to put a T-Rex flybar control on it ( I didn't trust the garbage that come on it). Complete T-Rex tail rotor system, and I got a boom servo mount for the rudder servo which works great. Tail performance improved 1000% over stock setup. ALong with the 120deg CCPM upgrade, I now have a pretty nice MX-400.

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    < Message edited by crashcrash -- 2/5/2008 6:37 AM >

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    RE: HeliMax MX400 CCPM heli - 7/10/2009 8:51 PM   
    S_Dave



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    Status: offline     		"dink, dink, dink....is this thing turned on??"

    crash2,
    It's been about 18mo since a post on this thread. Are you still flying that good-looking customized MX400 ?

    Mine's still alive. I've got a couple of thempeople move up (they think) and unload theirs, so I've got a fleet.

    Dave

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