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HomeAircraftHelicopterMain Discussion › Nightmare!!!
03-04-2008 12:43 PM  10 years agoPost 1
Aussie74z

rrNovice

Australia

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Hi all,

I have been searching the RR forums for some time now and can't find a solution to my problem...

I have a walkera 60 with a brushless motor and ESC which keeps glitching. the motor will cut out for a fraction of a second and then start right back up again. I changed the radio gear over to JR X2610 and JR RS77S receiver. the problem still exists. i changed the ESC over with a brand new unit and still the problem stays.

Thinking it might be a crap heli, I went out and bought a T-Rex 450S GF and set it up, but the same problem is still there.

Fully charged battery, take off, 30 seconds later it will cut out for a fraction of a second and then continue, then cut out etc. the Rx is PCM which seems to be everyone's simple fix to the problem but it is still there even with the PCM Rx...

no other servos have any problem, just the Motor. i have re routed the antenna many times and have moved the RX from place to place with no change in behaviour.

this glitch caused the demise of my Walkera Heli and i don't want the same to happen to my shiny new T-Rex...

Thanks in advance for your help,

Mark

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03-04-2008 12:54 PM  10 years agoPost 2
f14tomcatfreak

rrVeteran

rochester,ny us

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has this pcm rx been in a crash prior to this problem ?

shut up and fly

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03-04-2008 01:03 PM  10 years agoPost 3
tlankford01

rrApprentice

Amarillo, TX 79110

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If you have not used a ferrite ring from the esc I would suggest tring that.

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03-04-2008 01:07 PM  10 years agoPost 4
Steff Giguere

rrProfessor

St-Eustache, Quebec, Canada

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I'm puzzled, the two things I would have checked are the ESC and the receiver, which you have already done. When you find the solution I'd like to know what it was. Good luck.

Team Synergy, Rail blades, Team Scorpion, V-Team

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03-04-2008 01:44 PM  10 years agoPost 5
MattC

rrNovice

Tamworth, UK

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I had exactly the same problem with my trex 450SE-v2

http://runryder.com/t392481p1/?highlight=anodised+parts

I turned out to be all the anodised part creating seperate electical potentials which would discharge between one another, a bit of sanding off the anodising in places and a few earth straps and everything is fine.

I've also fitted a carbon boom, so I've run an earth strap down the boom with cable ties to ground the tail to the same potential as the main body of the heli.

I was using a ppm receive and was still getting the odd glitch but dramatically less than before. I now have a pcm receiver and i do not get any glitches at all, a fantastic little heli

Cheers

Matt

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03-04-2008 02:16 PM  10 years agoPost 6
cessna151

rrVeteran

Missouri... Originally Indiana

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It might help to know what ESC and motor you have. Of course pictures will help too.

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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03-04-2008 02:46 PM  10 years agoPost 7
T-Rex-Flyer

rrElite Veteran

Panama City, Fl

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Hi Aussie74z
Sounds like you're ESC is shutting it's self down, turn off the current limiting, also reduce the voltage cut-off and time you're flights using the 80% rule.

If the wings are traveling faster than the fuselage, it's probably a helicopter.

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03-04-2008 03:15 PM  10 years agoPost 8
RAK402

rrElite Veteran

Alhambra, CA

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Mine did this with an Align ESC and a JR 790 Rx.

I agree with MattC.

Check the tail struts screws at both ends. This was the culprit with mine.

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03-04-2008 09:49 PM  10 years agoPost 9
Cornster

rrApprentice

Medford, MA USA

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Doesn't sound like an RX/TX control issue. You stated you switched reciever, ESC, and heli but the problem persists. I would be willing to bet your problem is in your motor. Either a loose/broken wire or a bad wind in the motor. Try replacing the motor and see if that fixes you.

I fly.....because I can.

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03-04-2008 11:06 PM  10 years agoPost 10
Optech

rrKey Veteran

San Diego, CA.

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I was using a ppm receive and was still getting the odd glitch but dramatically less than before. I now have a pcm receiver and i do not get any glitches at all
Not true

Your still getting them, but with PCM, your not seeing them. With PCM, unless the glitch lasts long enough to go into fail safe, you wont see it. Thats why I always use a PPM receiver first until I'm sure I can fly without any glitching then I switch to a PCM receiver for the fail safe features.

Actually now I'm converting everything over to 2.4G.

Mike

Viva La Airtronics!

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03-04-2008 11:41 PM  10 years agoPost 11
Aussie74z

rrNovice

Australia

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Hey guys,

Thanks for all your help, i will try earthing everything and see how that goes. also will try switching the esc safety stuff off. also the trex came from factory with a ferrite ring on the esc control line and the problem still exists...

Could it be the batteries? the batteries are the only other common thing between the two helis. when i changed to the T Rex i switched over the radio gear and the batteries from the walkera. the t rex has brand new servos, brand new ESC and motor.

Both helis have the exact same problem. no glitching in the servos just the motor.

CORNSTER, I don't think it is an issue with the motor as it is brand new (i only assembled the TRex on Sunday, i picked it up brand new in Taiwan on the way back from a holiday in the states.)

I will post pictures soon...

Thanks again guys!!! I really appreciate you taking the timeto help me

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03-04-2008 11:54 PM  10 years agoPost 12
Droid

rrElite Veteran

Deep down in the Southwest- UK

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Could it be the batteries?
Sounds like you could have answered your own question there.......

What are they???

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03-05-2008 12:35 AM  10 years agoPost 13
Aussie74z

rrNovice

Australia

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These Photos show both the walkera and the trex. Note the battle damage on the walkera (actually flew quite well with the JR Gear and proper setup, apart from the glitchy motor of course)...

Could be the batteries although it does it with either battery (i have 2 of the same, they came with the walkera) I have seen these mystery products at the LHS under a different name but i don't remember what the other name was.

The current setup that you see on the TRex is the third arrangement of gear i have tried. i have relocated the battery, Rx and ESC with the same result.

I am yet to try earthing.

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03-05-2008 12:37 AM  10 years agoPost 14
Aussie74z

rrNovice

Australia

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Photos didn't work.

I will try to repost

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03-05-2008 12:40 AM  10 years agoPost 15
Droid

rrElite Veteran

Deep down in the Southwest- UK

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Could be the batteries although it does it with either battery (i have 2 of the same, they came with the walkera)
This could well be your problem.........................

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03-05-2008 12:47 AM  10 years agoPost 16
Miguel

rrNovice

Quebec, Canada

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voltage
Hi

I have the same problem with walkera 60 and then I pass to t-rex 450 too.
This part help me a lot to solve this problem.
http://www.spektrumrc.com/Products/...?ProdID=SPM1600

I hope it could help

T-Rex 450 SE V2 / Blade CX2 / Spektrum DX7 / AR6200

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03-05-2008 12:48 AM  10 years agoPost 17
Aussie74z

rrNovice

Australia

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03-05-2008 12:57 AM  10 years agoPost 18
GMONEY

rrApprentice

Upland CA

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I had the same type of problem with my Mini Titian.. about flight 70 I started getting the little kick and with each charge it got worse.. I tried everything even sent my ESC in for the upgrade. I borrowed one of my buddys new batts to try and all the sudden problem solved. needless to say I had to buy two more packs.. Those packs both had over 500 cycles on them.. Borrow a battery from a bro and see if that works..

G

I am an IDIOT!!!

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03-05-2008 02:50 AM  10 years agoPost 19
TaleGunner

rrElite Veteran

Deer Park WA

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Batteries would be my first attempt then consider an ESD. Spray the belt with silicone lube TRI FLOW work for me this will stop the static buildup and it wont send and ESD causing glitch.

CRASH! GLUE! REPEAT!
Spectra-G, Ion X-2

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03-05-2008 06:22 AM  10 years agoPost 20
Aussie74z

rrNovice

Australia

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I just changed the cutoff voltage on the esc and it still has the same issue. i then put in a fresh pack and it flew fine for a couple of minutes till starting up again.

I'm thinking its the batteries causing the issues.

The batteries are 2000mAh, 11.1V, 12C. do you think that the discharge rate might be a little low on these batteries? perhaps 20C or 15C might be better???

Any battery experts please chuck in your 2 cents worth.

Thanks!!

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