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Need Help, rotor won't spin up


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oldmanflyer
Extreme 3D
Extreme 3D


Joined: 13 Jan 2010
Posts: 135
Location: Deptford, NJ. USA

PostPosted: Thu Apr 29, 2010 10:28 pm
PostPost subject: Need Help, rotor won't spin up
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Hey guy's I need help,
on battery pack #4 I did a dump mistake. I never change the thorttle hold switch to 0%, it was set at 50%. I was doing Radds course battery #4, and when I went to put the heli back in the box I hit the thorttle hold switch accidentally. And you all know what happen then.Well now the rotor head will not spin up with the motor, it will spin a little. What can be the cause the this problem. All suggestion will be appreciated.
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tombo242
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Thu Apr 29, 2010 10:49 pm
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Hi oldmanflyer,

You don't say what T-rex model it is, but possible causes, not in any particular order, are:-

Gears slipping.

Jesus bolt (or two) snapped. Quite likely if the motor is spinning normally.

Damage to the ESC.

Damage to the motor.

Battery current over its max' ruining the battery. Not too likely that one.

Idea Let me know if after a check it's none of these and I'll think again.
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oldmanflyer
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Joined: 13 Jan 2010
Posts: 135
Location: Deptford, NJ. USA

PostPosted: Fri Apr 30, 2010 3:37 am
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Sorry about that, it is a T-Rex 450 SE, the motor will spin-up fine. I don't think it is the ESC/ICE 50. I'll have to check the jesus bolt.
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tombo242
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Joined: 04 Nov 2008
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Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Fri Apr 30, 2010 4:54 am
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Sure oldmanflyer,

If the motor's good the the Jesus bolts (check both head and gear bolts) are prime suspects. One is likely to be sheared, but even if the other is only slightly damaged then it is worth while replacing it.
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oldmanflyer
Extreme 3D
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Joined: 13 Jan 2010
Posts: 135
Location: Deptford, NJ. USA

PostPosted: Fri Apr 30, 2010 5:24 am
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Thanks Tombo242, as soon as I can I'll do that.
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oldmanflyer
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Joined: 13 Jan 2010
Posts: 135
Location: Deptford, NJ. USA

PostPosted: Fri Apr 30, 2010 5:33 am
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Tombo242, I just checked it out and quest what it was. The pinion set screw was lose.
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tombo242
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Joined: 04 Nov 2008
Posts: 4718
Location: Santo Estêvão, East Algarve, Portugal. Now 82, but still feels 22.

PostPosted: Fri Apr 30, 2010 1:59 pm
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Thanks for letting me know Oldmanflyer, looks like my very first hint was right! Very Happy

(It's not always Sad .)
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