Brushless motor kicks back at low throttle settings??? - RC Groups
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Aug 28, 2004, 12:39 AM
Registered User

Brushless motor kicks back at low throttle settings???

I have an E-flight park 370 and a CC-25 speed control. When you advance the throttle slowly, as soon as the motor wants to start to turn, it kinda jumps and wants to kick back, but when you advance the throttle past this point it is fine. I have checked the gear mesh and that is fine. Is this just normal behavior? Also, are different brands of brushless motors wired up differently? I have a himax 2015 and when it is plugged into the speedo red-to-red, black-to-black, etc.. it turns in the right direction, but my e-flight motor turns backwards when plugged up like this. Is it OK to just reverse the red and the black wires? Thanks in advance for any advice that you guys can lend.

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Aug 28, 2004, 01:06 AM
Electric since 1990
Foamaholic's Avatar
Many brushless motors, including my Himax which is basically the same as the E-flight, kick a little on the first click of throttle.
It's normal. Just advance the throttle a little faster at first.
It's fine to switch any two wires on a brushless motor. That's how you get it to change direction.
Aug 28, 2004, 01:37 AM
Low AltiDude
PGR's Avatar
The Phoenix 25 has 2 settings which can cause the stutter-start problem you describe if set incorrectly: Electronic Timing Advance & Soft Start.

I'm not familiar with the E-Flight motors so I can't really suggest a setting for the Electronic Timing Advance. You can experiment a little, though, but beware that more aggressive timing draws more amps.

Before messing with the timing, try turning off the Soft Start and see what happens. I had to do this on a 3D plane to get an AXI to restart reliably.

Aug 28, 2004, 08:22 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
A bit of a wiggle is normal for brushless motors, ESC trying to figure out rotor position for synchronisation.

Met vriendelijke groet Ron van Sommeren
Aug 28, 2004, 09:49 AM
Registered User
Thanks for the advice guys.
Aug 28, 2004, 09:55 AM
Who Put that Tree There?
Krashlnd's Avatar

Same problem here

Thats what I did. I turned off the soft start. Like a charm now.
Mar 24, 2015, 03:30 AM
Registered User
Some of the CC ESC's and possible motor combinations need a higher starting current setting.
A possible way to determine this is to see if the problem occurs with out a propeller, and increase the starting current setting until it is less or goes away. If adding the propeller causes it to return, try increasing the current further. Rapid throttle advance may also cause the problem to occur.
Mar 24, 2015, 07:43 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Jeez Chuck, where did you dig that one up ?

Vriendelijke groeten Ron
Mar 24, 2015, 08:14 AM
I am a nice guy! Really!
Throwback Tuesday? I hope not! Eh bien, better late than never with the help.

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