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Blade mCPX › At a lost with this bird...whats going on??
03-07-2013 02:32 PM  5 years agoPost 1
chopper_crazy

rrElite Veteran

Delphos, Ohio

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I purchased this heli new about 8 weeks ago. I have 30 indoor flights on it. Only been flown in a gym, no hard 3d and have never had to replace a part, therefore never been crashed hard. For the last three weeks I have been battling the tail not holding, so per recommendation, I went out and bought the xl boom that blade makes for the mcpx. I put that boom on and really it has been the same issue. For the last two weeks, the tail all of a sudden will turn in 1/4 turn increments with no rudder movement on my part. Although weird, I thought maybe it was just a part of this bird. So tonight, I thought I would give the stock boom a try again, maybe the xl boom motor is going bad or something. Same thing, the tail just turns in 1/4 piro. On the third and final battery of the night I was flying it, out of the clear blue, the heli loses main rotor power and slowly decends to the gym floor. No idea why??? I walk over to it and everything seems normal so I power it up again, get to a 15 foot hover and it looses power again. What the heck?!?!? The battery I was using only has 5 flights on it and it is a good battery. Any thoughts or ideas? I'm ready to get rid of it at this point

It's a complex, costly, glow powered anti-gravity machine!

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03-07-2013 03:09 PM  5 years agoPost 2
jschenck

rrProfessor

La Vista, NE.

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was the blue light flashing? Could take a look to see if the antenna (left rear side of the main board, copper wire coiled around the canopy mount) is touching something on the tip. Also check to see of the connections are all solid into the main board.

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03-07-2013 03:26 PM  5 years agoPost 3
Cromer

rrApprentice

Germantown, NY

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It might be your main motor going bad. I know 30 flights does not sound like much but I have read reports of guys only getting 30 or 40 flights out of a motor. I also read that it has not been crashed hard but do make sure to check that your main gear is all the way on the main shaft and has not dropped down a bit. This usually just shows itself as not enough positive pitch to get off the ground so I don't think it is your real problem but it would be something to check.

Phil

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03-07-2013 03:41 PM  5 years agoPost 4
fla heli boy

rrKey Veteran

cape coral, florida

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when all else fails...rebind. I just bought a used one to give to my brother with a DX4 I had laying around. Did nothing normal out of the box and thought maybe it was an issue with the bird. So I bound it to my DX8 and oila, the bird is perfect, maybe even better than my own upgraded machine. I always try to remember to address the simple and obvious first, after years of tearing stuff apart and never looking at the simplest solution....... KISS

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05-10-2013 03:05 AM  5 years agoPost 5
Zaneman007

rrElite Veteran

Texas - USA

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I have to go with the main motor theory.

The batteries on this heli are, well "just" doing the job. Anything that causes an excess drain on the battery will effect the tails holding authority.

Old Guys Rule!

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05-10-2013 06:06 AM  5 years agoPost 6
DougPenhall

rrApprentice

San Jose, CA - USA

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I have two mCPx birds, a V1 and V2. Both have weak tails. Seems to get worse as the battery gets low. I've been using it as an indicator to tell me when to stop flying and charge the battery, but now the batteries are getting old and weak so it happens right away on freshly charged batteries.

As for the loss of power, check the main gear to make sure it's meshing properly with the motor gear. If it's not, push the main rotor shaft down while pushing the main gear up. Hopefully that fixes it. If that's not the problem, make sure it still happens with your other batteries before blaming the bird. You might just have one battery that's too weak. As Zaneman says, these batteries are barely enough to keep this bird flying when they're new.

Also, as Heli boy says, the mCPx does fly a lot better with your own pitch and throttle curves than it does with those in the DX4.

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05-11-2013 03:15 PM  5 years agoPost 7
TurboRacer

rrVeteran

FL

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Check the blade balance! Spin it up in your hand.. Any vibes? Balance the blades..

Vibes will throw the tail off for sure.

If all else fails, sell it and get the MCPX BL - it's much better !

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05-11-2013 05:07 PM  5 years agoPost 8
fla heli boy

rrKey Veteran

cape coral, florida

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my brand new BL is a bust. One decent flight and now I can't get it off the ground. I'm going to hold my nose, re-bind and try it one more time. I'd sell it, but I won't sell something that's not in flying condition, so it may be headed back to Horizon. I think I may have a bad controller.
Never had any issue with any of my other 3 Blade helis.

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05-13-2013 04:54 PM  5 years agoPost 9
1heliman

rrApprentice

us

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Main motor, replace it.

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05-13-2013 05:01 PM  5 years agoPost 10
fla heli boy

rrKey Veteran

cape coral, florida

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Problem solved on my BL and it's a weird one. I'd hovered it around for a couple packs with no issues, then tried it a few times at the field a couple weeks later and it just acted like it wasn't bound. Really odd. I whiped it out in my TX and rebound it (I've re-bound several times) and re-programmed everything and it's spot on now....other than a bit of tail wag now and then. I must've had something buried in there that was wrong. But I say odd because I had flown it before with no issues.

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05-13-2013 09:51 PM  5 years agoPost 11
jason46

rrVeteran

MI

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Might be the 3in1 going bad. Aside from the tail letting go in 1/4 turn increments I was experiencing a similar issue with a nano. During flight it would lose bind or power and unexpectedly sink like a rock. Only a rebind would fix it and a few batteries later I was rebinding it every flight and eventually it would only work for about 30 seconds. Initially I was blaming the radio but I eventually tried two different radios and experienced the same issue. I sent it to Horizon as it was roughly a week old and had maybe 20 flights and maybe half of those were trouble free ones. Nothing was found out of spec, but in the spirit of service the 3in1 board was replaced and I haven't had the issue since, and now it has seen enough flights to wear out a few motors.

Not sure how helpful this will be in your situation, but maybe it will give you some insight.

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05-18-2013 08:49 PM  5 years agoPost 12
pigs dont fly

rrKey Veteran

City, State - Country

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Tail stepping out by 1/4 turn is vibrations causing the gyro to error, mine does it sometimes after its been crashed. Have a good look over it, has the tail prop got bent? Main gear running true (not warped) or with flat spots? My 2c.

Warning...This hobby is very addictive and may damage your wealth

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06-24-2013 04:39 PM  5 years agoPost 13
OT45

rrApprentice

Kingston, NY

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If your main mast is split it will induce oscillations in the tail.
See if you can twist the head while holding the main gear. Repalce it with a MCPx BL main shaft as that one is stronger (same length and od with thicker wall thickness)
Also check your tail connector on the board. Use hotmelt glue to secure it. (Easy to remove later with a alcohol)
Last, check your main connector to the battery. The wire inside the heatsrink failed on mine causing it to initialize but cutout in flight. Same wiring can fail at the board after a while.

scratch building is not just for planks

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