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-   -   Spectrum smart ESC Extension (https://www.wattflyer.com/forums/showthread.php?t=81812)

johnsctt78 09-01-2021 06:05 PM

Spectrum smart ESC Extension
 
hi guys
im upgrading my e flite esc to a spektrum smart ESC. the issue im having is my battery side is about 8 inches short.could i add an extension to the smart ESC at that length and not have any issues?the EDF is the e flight thunderbird 70mm and the channel in front of the fan motor wont allow for it to go to far forward

Wildflyer 09-01-2021 07:27 PM

No, you can't just add wire to the battery side. It does all kinds of bad things to the ESC. Ron Van Sommeren has several posts about this. Try to look up his posts.
You can extend the motor side, but that sounds like it may not work.
Can you cut a larger area?

johnsctt78 09-01-2021 07:33 PM


Originally Posted by Wildflyer (Post 1031043)
No, you can't just add wire to the battery side. It does all kinds of bad things to the ESC. Ron Van Sommeren has several posts about this. Try to look up his posts.
You can extend the motor side, but that sounds like it may not work.
Can you cut a larger area?

Thnx for the reply Wildflyer
im going to move the esc to the backside of the cockpit close to the CG and run a extension from the back of the ESC(motor side) to the EDF fan unit.this way no cutting etc and clean looking. thnx for the input

ron_van_sommeren 09-03-2021 07:18 AM

If you cannot but extend, extend the motorwires, not the batterywires, and keep controller(s) close to battery(s).
No need for extra input capacitors, resulting in more space, less costs and less points of failure :)

Too long wires batteryside will kill ESC over time: precautions, solutions & workarounds - RCG
Contents
  • Two problems
    • Voltage spikes higher than battery voltage: transistor / powerFET / die breakdown.
    • Current through input capacitors too high: caps overheating/popping/exploding.
    • Nonsense Ron, I never had problems with long battery wires.
  • Example: four costly controllers consecutively cremated :(
  • Solution I: simply lengthen the motor wires instead :)
  • Solution II: add extra capacitors, rules of thumb
    Calculation spreadsheet
  • Capacitor type and polarity/orientation!
  • How & where (not) to add extra capacitors
    All capacitors as close to or on controller, do not distribute along batterywires.
  • DIY capacitor pack pictures
  • Capacitor & pack suppliers
  • Expert/manufacturer opinions & their rules of thumb
    They all say the same ... noise_reduction_101, switching_power_supply_design_101.
  • Cause, explanation, water hammer/knock analogy&
    , theory
    References
  • Measurements & scope traces

diy motor tips&tricksCumulus MFC •[/SIZE]

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