RE: HeliMax MX400 CCPM heli "build" thread  
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    • All Forums >> RC Helicopters >> Electric RC Helis >> RE: HeliMax MX400 CCPM heli "build" thread
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    RE: HeliMax MX400 CCPM heli "build" thread - 2/16/2006 2:40:54 PM   
    jh4db536


     

    Posts: 530
    Joined: 5/22/2005
    From: Monterey Park, CA, USA
    Status: offline     		there's no need for a 13t on a trex unless you want 3d headspeeds. 11t should work fine for most people in either heli.

    are you using governor or fixed?? my point is you cant "slow" the motor down too much to have a lower headspeed because that WILL increase the amp draws. i dont run this high headspeed for 3d, i do it because it yields the best temp and flight time (it's very obvious that the motor is more efficient running at certain speeds). i fly in idle up only with a flat throtle curve + governor mode 1 or 2 steps down from the WOT light being on 100% of the time.

    on my radio, approximately 28pts/100pts on the curve represents WOT (yeah it's kinda weird). i run a horizontal line at y=25. it would be even more efficient if i ran a little higher, however, the higher headspeeds cause wagging and vibration on the x400 because of the stupid 5:1 tail rotor ratio which means the t/r rpm is probably like >12,500rpm. im gonna attempt to install a trex SE 4.24:1 tail drive reduction and then it might go away.

    also, the lowered gear ratio on the tail drive might also lower amp draws at high headspeed further since there's more mechanical advantage and it doesnt have to fight the forces of >12,000rpms.

    < Message edited by jh4db536 -- 2/16/2006 2:45:54 PM >

    (in reply to cptsnoopy)
           Post #: 176

    RE: HeliMax MX400 CCPM heli "build" thread - 2/16/2006 7:39:36 PM   
    cptsnoopy


     

    Posts: 540
    Joined: 2/26/2005
    From: Phoenix, AZ, USA
    Status: offline     		The plan is to try an align 35g in gov mode. I like the idea of not having to fine tune the throttle curve. My cc-phx-35 was cutting out now and then (i guess I will need to send it back) it would loose power for about 2 seconds and then power back up. The cutoff voltage was set to 4.0 and the current protection was disabled. The problem occured with two different motors so I guess it was the speed controller. I replaced it with a cc-phx-25 with the same settings and the problem went away. I am putting the 35g on to get ready for the 450th. I will start with the 11tooth pinion as you suggested and I will drill out a 9 and 10 tooth pinion to 3.1mm just in case. The AON3500kv I am using now has plenty of power but it gets really hot so I want to try something cooler as it gets really hot outside here in the summer.

    (in reply to jh4db536)
           Post #: 177

    RE: HeliMax MX400 CCPM heli "build" thread - 2/16/2006 10:48:56 PM   
    heliNate


     

    Posts: 20
    Joined: 6/25/2005
    From: Lexington, KY, USA
    Status: offline     		cptsnoopy,

    If you have a CC link cable you might trying updating the software. There was one version that had cutout issues. I'm not sure what batteries you're using but if the C rating is too low that could cause cutout issues too. I had the same kind of issues and changed both of these at the same time. Not sure which fixed it but it flies great now with no cutouts.

    (in reply to cptsnoopy)
           Post #: 178

    RE: HeliMax MX400 CCPM heli "build" thread - 2/17/2006 2:01:56 AM   
    cptsnoopy


     

    Posts: 540
    Joined: 2/26/2005
    From: Phoenix, AZ, USA
    Status: offline     		HeliNate,

    Thanks for the suggestions, I am pretty sure I have 1.14 in the controller now. It was the latest non-beta software for the 35. The 25 software had different numbers but it has the latest non-beta also. I will try loading the beta to see if it helps. I am using two brand new TP2100 15C continous/24C burst batteries. They should not be a problem but I guess you never can tell. When I put the cc-25 in the cutout issues seemed to go away but I want to use the 35 with the 450th so I will mess with it a little more before I call cc up for service.

    (in reply to heliNate)
           Post #: 179

    RE: HeliMax MX400 CCPM heli "build" thread - 2/22/2006 12:29:35 AM   
    Reefpainter


     

    Posts: 10
    Joined: 1/24/2006
    From: Port Saint Lucie, FL, USA
    Status: offline     		I have a HeliMax MX400 Pro on it's way. I read earlier in this thread about using thread-lock or "Loctite" on all of the bolts. Years ago, I used the regular red permanent Loctite on my Concept 30. Which is actually recommended?

    Red - Permanent
    Blue - Removable
    Green - Penetrating

    I'm leaning toward blue in order to be able to take my machine apart and upgrade later.

    Any opinions welcome.

    (in reply to jh4db536)
           Post #: 180

    RE: HeliMax MX400 CCPM heli "build" thread - 2/22/2006 1:26:51 AM   
    marter1229


     

    Posts: 19
    Joined: 8/13/2005
    From: Coeur d'alene, ID, USA
    Status: offline     		Use blue on all screws that are metal to metal. Metal to plastic don't use any.


    _____________________________

    Terry

    (in reply to Reefpainter)
           Post #: 181

    RE: HeliMax MX400 CCPM heli "build" thread - 2/22/2006 2:07:27 AM   
    EZ Money


     

    Posts: 149
    Joined: 6/3/2003
    From: Las Vegas, NV, USA
    Status: offline     		I am just completing my conversion to ECCPM. Haven't set up the pitch yet but I can tell you that the conversion was worth the small cost and the effort.

    The cyclic is smooooth now with no slop. It even seems to work better than my T Rex CDE.

    Highly recommended.

    Will report back later.

    _____________________________

    Ron Landram
    http://www.ezmoneyracing.com

    (in reply to marter1229)
           Post #: 182

    RE: HeliMax MX400 CCPM heli "build" thread - 2/22/2006 2:18:44 AM   
    Reefpainter


     

    Posts: 10
    Joined: 1/24/2006
    From: Port Saint Lucie, FL, USA
    Status: offline     		I kinda thought so.

    Thanks Terry!

    (in reply to EZ Money)
           Post #: 183

    RE: HeliMax MX400 CCPM heli "build" thread - 2/23/2006 2:11:27 PM   
    Air-Wolf-4U


     

    Posts: 32
    Joined: 9/4/2003
    From: LangleyB.C., CANADA
    Status: offline     		Hi All!
    Question...If I am having problems lifting off the ground and almost need full power to do so on my MX400...What would bew the things to check??
    I know my batteries are excellent (15c continous & 20c burst), Align 420 (3200kv) motor with 12 gear pinion (Not sure if this is the right pinion though), Weight would be the same as everyone else, Futaba 502 Gyro, Futaba 9CHP Radio, Hitec 56s Servo's. Everything seems to look right and the pitch is set-up the same as the throttle 0-50-75-90-100. 8 Degrees Positive pitch and 2 degrees negative.

    Any thoughts??

    Thanks !


    Dwayne



    (in reply to Reefpainter)
           Post #: 184

    RE: HeliMax MX400 CCPM heli "build" thread - 2/23/2006 7:22:35 PM   
    cptsnoopy


     

    Posts: 540
    Joined: 2/26/2005
    From: Phoenix, AZ, USA
    Status: offline     		my thought is that the pitch is too low assuming that your getting plenty of headspeed. If your max pitch is 8 degrees then your barely getting enough to rise out of ground effect. make sure you have at least 10 degrees available and for your norm pitch mode try using 3 to 5 degrees at 1/2 to 5/8ths collective stick position. If you have a tach available it will help you trouble shoot the setup alot quicker.

    for norm mode pitch I have 40-inh-60-inh-90 with expo on (JR 8103) When I was running fixed throttle mode on the castle I used a norm throttle curve of 0-inh-50-inh-100 with expo off. I am using gov high mode now so I did not fine tune the curve.

    The pitch setup on my heli is +11 at 100% and -11 at 0% (in idle up 2) with 0 degrees pitch at 50%. That last 3 or so degrees in pitch really makes a big difference in climb.

    (in reply to Air-Wolf-4U)
           Post #: 185

    RE: HeliMax MX400 CCPM heli "build" thread - 2/23/2006 7:56:34 PM   
    AirBearMA



    Posts: 225
    Joined: 3/18/2003
    From: North Attleboro, MA, USA
    Status: offline     		Does anyone have any info on how to setup the Helimax 25 ESC that comes with the MX-400 Pro? I can't find this info anywhere.

    _____________________________

    AirBearMA
    The bear in the air.....

    (in reply to cptsnoopy)
           Post #: 186

    RE: HeliMax MX400 CCPM heli "build" thread - 2/23/2006 8:06:46 PM   
    codepunk


     

    Posts: 129
    Joined: 1/12/2004
    From: Sammamish, WA, USA
    Status: offline     		Well, after finally getting everything put together I took it out to the garage to see if it would hover (oh, it's a MX400-Pro). Did it? Nope, unfortunately not. Even at full throttle, it just stayed on the ground. This is my first CCPM heli and my first ARF heli (previous 2 heli's were already put together) so it's a learning curve. Here's some questions.

    1. What should I do to get this thing to lift off the ground? Adjust the pitch? If it's that, how do I go about doing that, on the radio, adjust servo arms, something else?

    2. I am using the motor that came in the box. I had to go buy a 1.5mm hex key to actually put that little screw into the pinion to secure it to the motor shaft. However, it keeps coming loose. I asked my LHS if I should loctite the pinion screw and he said I wouldn't need to (I'm guessing he told me wrong). So, should I take that screw out, put some loctite on it and hurry and screw the pinion onto the motor shaft? Is there a better way to do that?

    Thanks for all the help. BTW (and I'm stabbing in the wind) if anyone lives in the Seattle area and can help, I would seriously appreciate it. I'd give you my first born...well...ok, maybe not that but we could work something out.

    (in reply to cptsnoopy)
           Post #: 187

    RE: HeliMax MX400 CCPM heli "build" thread - 2/23/2006 8:12:44 PM   
    bdavison


     

    Posts: 3350
    Joined: 8/23/2004
    From: Warner Robins, GA, USA
    Status: offline     		8 degrees is more than enough to get airborne if the blades are turning at around 2400 rpms. Ive got mine set at 8 and it flys fine, 11 degrees will bog it down on the 420LF.


    As far as locktite....LOCKTITE the heck out of the tail rotor blade grips. And check them before each flight...they WILL loosen up. And if one comes off....well, you know what comes next.



    < Message edited by bdavison -- 2/23/2006 8:14:50 PM >

    _____________________________

    teamflyingcircus.com

    (in reply to AirBearMA)
           Post #: 188

    RE: HeliMax MX400 CCPM heli "build" thread - 2/23/2006 11:01:04 PM   
    cptsnoopy


     

    Posts: 540
    Joined: 2/26/2005
    From: Phoenix, AZ, USA
    Status: offline
    quote:

    ORIGINAL: bdavison

    8 degrees is more than enough to get airborne if the blades are turning at around 2400 rpms. Ive got mine set at 8 and it flys fine, 11 degrees will bog it down on the 420LF.



    if you have your max at 8, at what collective stick position does your heli lift off? How do you have your pitch/power curves set? Air-Wolf_4U would like to know...

    (i take it your calling my info bs?)


    (in reply to bdavison)