Hard start versus soft start electric motors - RC Groups
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Sep 30, 2002, 01:41 PM
Registered User

Hard start versus soft start electric motors

I have just installed a Mega 30/4 with a 2/1 planetary gearbox on a Rascal 40 conversion. I am using a Jeti/Hacker 30 Optical ESC. The prop. is an APC 16x12 electric. When I advance the throttle, I get a really sudden "hard start" on the motor, with a loud "clack." It runs fine, but I worry about damage to the gear box or motor from the hard start. I have tried lowering the trim for the throttle on the transmitter, and I have also put in 50% negative exponential on the throttle, but nothing seems to prevent the sudden and loud "hard start." Anybody have any ideas? Do I have a unique problem or is this something to be expected? Maybe I shouldn't worry about it, but I am accustomed to quiet, gradual "soft starts" on several other (smaller) controller/motor/gear systems.
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Sep 30, 2002, 01:57 PM
Registered User
So you have the Jeti/Hacker master controller? If so you need to change the timing on it for the mega motor, they come set for Hacker motors as default. that may be your problem.
Sep 30, 2002, 04:55 PM
Registered User

Change timing for Mega motor

Hi Cue -

Thanks for the suggestion. I did set the timing for a Mega motor, but your suggestion makes me think I should recheck it --- just to make sure I picked the correct beep-tone sequence.
Jul 07, 2016, 02:40 PM
Top Gun
Robert Boudreau's Avatar
Could anybody help me setup a HSD 150amp ESC to soft start, it came set to soft start, somehow I changed it to hard start & it's makes the motor bang when starting. I think I cane get to startup but what to do after I enter it?
Jul 09, 2016, 02:17 PM
Registered User
E-Challenged's Avatar
Not sure what brand etc. that ESC is but the directions may be available somewhere in PDF. If the ESC has soft start feature you can probably reprogram it for soft start using your transmitter throttle lever and following directions and listening for beeps very carefully. Remove prop before attempting to re-program ESC.
Jul 09, 2016, 02:40 PM
Registered User
kc8qpu's Avatar
I am not positive, but I thought I had read someplace that if you are running a gear box you should use soft start.