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Old Dec 25, 2012, 05:10 PM
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United States, FL, Middleburg
Joined Feb 2007
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t-rex 500 3gx question

I bought a used 500cf that has been converted to 3gx flybarless.

I have about a dozen flights on it so far but today i noticed something strange. the motor rpm started to surge. It was fluxuating 200 rpm or so up and down. it did that for two flights. On the third flight in normal throttle mode (non idle up) i lifted off into a hover, then as i went up with the power and collective the motor made a funny noise like it couldnt decide which way to run and i lost all head speed and she came down hard enough to break a gear.

when i strapped it to the bench and powered it up again to troubleshoot, i can throttle up slow and its all ok, but if i throttle up fast or go into idle up the motor stutters like it has a switching rate problem from the esc or something.

i have had a similar issue with an electric plane where i throttled up fast and it would stutter but slow it was fine, i changed out the crappy esc for a castle and problem went away.

I am using the align esc and motor in this heli, can i assume it is the esc in this scenerio as well, swap it for a castle ice 75 and problem solved?

anyone experience the same issue?
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Old Dec 26, 2012, 05:38 AM
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Letchworth, Great Britain (UK)
Joined Jul 2004
11,535 Posts
Not the same, but a similar issue with my 500. After a couple of years with the Align BL70G ESC (not the original) it started sort of stuttering from time to time. It was enough to cause the tail to flick about 3" sideways, then back, due to the momentary sudden loss of power, but first of all I thought it was a gyro or servo issue, and replaced them.

Then I realised the motor noise stopped momentarily every time this happened, so I put my original Align BL60G ESC back on, and it's been fine ever since.
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