Trying to figure out how to reduce the max speed. When I set the remote to M (medium) gear the speed is slightly too slow and at H (high) it is way too fast. I find that the remote is too sensitive so I find I have best success when I just put in in M and press the throtle to full and hold it there for the entire session. In high gear it is much too fast and the 3 seconds required to set the cruise control makes its pretty useless (for me at least).
Any ideas?
Thanks in advance
Remotes are not the problem, ESC’s are the problem. You need to be adjusting the limits on your ESC.
I think there are a few solutions, but mostly they cost money and work. I only know the more expensive and labor intensive solutions unfortunately:
- try other ESCs
- try adjusting the pulse width (going into the ESC) by adding a simple circuit of a few passive components (requires an oscilloscope)
- increase the speed of the M stage by increasing the battery voltage (adding e.g. 1s, 2s, …it’s easy to try), in that case the H stage will probably be unusable (too high battery current)
- increasing the speed of the M stage is achieved by replacing the propeller with a higher efficiency, in which case the H stage will be even faster, but with the original battery current, which is an advantage
- reduction of the H stage speed is achieved by replacing the propeller with a lower thrust propeller, in which case the M stage will probably be unusable (too low speed)
Thanks for the replies. Both pretty expensive as I’ve already got all the parts and it’s working (more or less).
Here’s an idea I think I’m going to try:
Insert a PWM to voltage cct in series with a voltage to PWM cct between the receiver and the ESC. This way I can trim the max PWM signal out to be whataver I want to the ESC after the esc has been calibrated. Thoughts?
Another solution for your ESC (HIFEI SWORDFISH X 300A 14S ESC) can be this programmable box https://alienpowersystem.com/shop/rc-ev-accessories/electronics/hifei-program-box/.
Hi, I don’t understand how this would help. Can you explain what setting I would change on my Swordfish X 300 A esc to reduce the max speed? I’ve reviewed the docs on the ESC that I can find and have seen no way to control top speed.
I’ve been thinking about trying this. Any advice on where to start with the circuit? Let’s say I want to reduce the PWM signal duty cycle by 20 % for example. Cheers.
Another idea that just occured to me. What if I use a pwm generator circuit to calibrate the ESC. I set the PWM to be 20 higher duty cycle than max throttle on the VX3 for calibration. Then when I reconnect the vx3 it will have effectively reduced the max speed. Makes sense?
I have read but I don ‘ t remember which remote can do this ( Maytech flipsky or ray…) : you can set the throttle max value wanted and the trigger play will be always full at this value
This may works :
Or drill and pin the trigger 
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Figured it out. I ran the calibration routine on the ESC and during th process instead of pulling the throttle to 100%(normal procedure) I only pulled it into about 80%. Now when I pull the trigger to 100% when in M gear it goes about 10% faster than before - which is perfect.
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Hi mlab, I know we are 18 months later but I am having the same issue with a VX3 and a vesc ESC. When you say “ran the calibration routing on the ESC” are you talking about withing the VESC software and not just the throttle calibaration on the VX3 - I tried the latter and it seemed to make it worse - that is M was even less useable and H was super “on/off”.
thanks for your help
