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T-REX 450 › Headspeed change irregularly
04-30-2010 09:29 PM  8 years agoPost 1
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rrApprentice

kr

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I use stock Align 35A ESC and 450M motor in my 450 sport.
When I resetup the heli after crash I found headspeed change irregularly so, in certain rpm heli body shakes left and right quickly.
with HS increase this 'shake' problem diminished.
I changed main mast, receiver.
I am suspicious of ESC or motor. which one?

Hornet,FP helis,Trex450 series,V100D01,mCP x and more

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05-01-2010 03:04 AM  8 years agoPost 2
MikeInMobile

rrElite Veteran

Mobile, Alabama

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How does the headspeed accelerate? If the headspeed acceleration is sluggish or erratic, the issue is probably in the motor (A shorted winding). If the acceleration is smooth, then the issue is more than likely in the ESC

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05-02-2010 06:11 AM  8 years agoPost 3
chan

rrApprentice

kr

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Thank for the reply.
'erratic' is the right symtom. but strangely that symtom appear certain mid rpm and as head speed goes to 100% then that symptom disappear

Hornet,FP helis,Trex450 series,V100D01,mCP x and more

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05-02-2010 06:35 AM  8 years agoPost 4
MikeInMobile

rrElite Veteran

Mobile, Alabama

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The ESC has to supply a lot more current to accelerate the head when the head is still or turning slowly. If the motor has a bad winding, you will hear a buzzing while the heli spins up (a buzzing sound, not a whine). The buzzing is caused by a magnetic imbalance in the windings. Additionally, the ESC will get a bit hotter than normal.

If you only hear a whine, replace the ESC. If the motor seems to make a buzzing sound, along with the whine, replace the motor.

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05-02-2010 10:07 AM  8 years agoPost 5
helinelly

rrVeteran

st.helens england

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its your lipo.s with the sound of it
what c rating are they.....if there under 25c somtimes the motors require higher c rating like rhino 40c 11.1v 2250.....just a thought to rule everthing out...kind regards helinelly

if it broken.....glue the bast#$d...keep flying..i tell the wife my crashes cost £20! works for me

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T-REX 450 › Headspeed change irregularly
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