Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

Tri Mortor set up

Old 06-15-2021, 09:09 AM
New Member
Thread Starter
Join Date: May 2019
Posts: 1
Default Tri Mortor set up

I am building a junkers ju52 3.7m. I am a bit concerned about the esc connection and location.
The outboard motors are quite a distance from the nose engine where the batteries will be located for CG purposes.
The motors are Leopard lc5065 330kv, with hacker opto iscolator ESCs and 4cell 8000mah bateries each motor will have two batteries (8 cell) connected in parallel. I am thinking of keeping the escs in the fuselage close to the batteries and make the motor cables extended.

Any advise welcome.

Kind regards
loukis is offline  
Old 06-15-2021, 04:04 PM
homo ludens modelisticus
ron_van_sommeren's Avatar
Join Date: Jul 2005
Location: near Nijmegen, Nederland
Posts: 1,343

What will be the wire length between battery and controller, and between controller and motor?

If you cannot but extend, extend the motorwires instead of batterywires and keep controller(s) close to battery(s). No need for extra input capacitors

Too long wires batteryside will kill ESC over time: precautions, solutions & workarounds - RCG
  • Two problems
    • Voltage spikes higher than battery voltage: transistor/FET/chip 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
  • Measurements & scope traces

Vriendelijke groeten en wees voorzichtig, Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
• E-flight calculators • watt-meters • diy motor tips&tricks • Cumulus MFC •

ron_van_sommeren is offline  
Related Topics
Thread Starter
Last Post
09-11-2019 05:50 AM
Helicopters- Electric For Sale & WTB
09-21-2015 02:31 AM
General RC items For Sale and WTB
11-16-2012 04:10 PM
dr rc
Helicopters- Electric For Sale & WTB
03-08-2012 11:57 PM
Beginners - Helis
11-14-2011 11:09 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Quick Reply: Tri Mortor set up

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.08345 seconds with 14 queries