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T-REX 450 › Trex 450 motor issue.
06-06-2010 03:15 AM  7 years agoPost 1
DH1

rrNovice

Australia

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I picked up a T-rex 450 xl. It had a gy240 on it. Standard motor and 35a esc. Its been flying fine up until I changed over to a GY401.and 9650 on tail.batteries are fresh and fairly new. It now flies fine for about a minute then the motor or esc starts to stutter or jitter. It's not cutting out but just behaving weird.the esc is set to medium voltage cut off. Have checked belt tension and motor mount seems to be loose if anything. As it was flying fine before the new 401 and I haven't changed anything I cant think what it is. I am pretty new at all this so any input would be awesome.any ideas? please.

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06-06-2010 03:43 AM  7 years agoPost 2
HeliGuy68

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Dallas, TX

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Ensure you running with fully charged packs and also set the speed controller configuration is set to l-m-h-m-m (1 beep - 2 beeps - 3 beeps - 2 beeps - 2 beeps).

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06-06-2010 06:22 AM  7 years agoPost 3
DH1

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Australia

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Thanks heliguy68.Yep batteries are all charged. esc set up identical to your set up.Running a very tame pitch curve,the recomended norm throttle curve and the old 3200kv motor with 13th pinion. All blades are firm but not too tight. I was flying this heli before with no probs. only difference is the addition of a 401 and futaba 9650.
It's not a normal low voltage power reduction where it feels like it surges it's more like a shuddering.has anyone experienced a similar problem?

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06-06-2010 02:20 PM  7 years agoPost 4
J_Cunny

rrVeteran

Austin, Texas

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Check your solder joints. Both sides (motor and ESC). My bet is a cold joint on one of them. If you have to resolder one, remember flux is your freind. It will make the solder flow smoother, and reduce the possiblity of a cold joint or incomplete bond within the wire.

JC

I used to be normal, but then I started flying heli's....

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06-08-2010 06:32 AM  7 years agoPost 5
DH1

rrNovice

Australia

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Thanks J cunny. Hit the nail on the head. the heli has been flying ok for a fair while now so I didn't think of the solder joint. opened it up and sure enough it's still holding together but when I hit it with the iron it literally fell apart to expose a cold joint that was doing the job but a bit of corrosion had made it's way between the joint. Thanks.

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06-08-2010 01:02 PM  7 years agoPost 6
DH1

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Australia

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Ok. Update just for interest sake. Upon closer inspection I think that the solder joints probably weren't great but they were not the problem. While pulling the esc out etc I noticed that that the pinion had lost it's grub screw completely and slipped down on the shaft. I think it must have been spinning on the shaft and overheating the esc and on the verge of shutting down.although the motor wasn't pulsing like the LVC should have. put it all back together and its working fine

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T-REX 450 › Trex 450 motor issue.
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