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Old Apr 23, 2006, 02:32 PM
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Joined Apr 2006
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Question
Long Leads

Just wondering:
If I have to run a long set of leads, which would be preferable:
Short lead from Batt to ESC, long lead to motor;
or Long lead from Batt to ESC, short lead to motor.?


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Old Apr 23, 2006, 02:43 PM
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long heavy leads from batt to ESC is better for brushless... for brushed it doesn't matter if the long leads are between motor and ESC or Batt and ESC.

Be sure to use heavier guage wire when running longer leads. Minimizes resistance in the wires.
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Old Apr 23, 2006, 03:39 PM
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It will be interesting to see what others say (not saying you are wrong) ... I've heard different stories.

On my YF-23 I have about 4-5 inches from the batteries to the ESCs and then about 24" from the ESCs back to the motors. Am I asking for trouble? Or do I have it right?

Lets hope others chime in on this issue. ...and soon, I'm almost ready for my maiden flight.
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Old Apr 23, 2006, 04:12 PM
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I am NO expert here, but<g> from what I have read... long leads are a no no from battery to esc. 18" max including what is in the battery pack. OR you should put some large caps(330mf & greater voltage than used) on the leads near the esc. 22-23" is probably pushing it a little?
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Old Apr 23, 2006, 04:14 PM
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Opps, forgot ,
sounds to me that you have it correct.
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Old Apr 23, 2006, 04:17 PM
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Long leads from battery is OK with reason. One of my brushless motors says distance from ESC to motor leads should be NO longer than 8".
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Old Apr 23, 2006, 04:44 PM
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one way or the other I'm looking at about 18-20" of leads total from batt to ESC to Motor. (for the tail motor) Wings are no problem.
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Old Apr 23, 2006, 05:07 PM
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Joined Feb 2004
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I've spoken with some old timers who have lots of experience with radars, brushless and brushed electric motors. One friend has an oscilliscope and other measuring tools. He has told me longer leads from the battery to ESC is a better choice on brushless if you need longer leads. He's not sure if it really matters one way or another within reason of course. He just says to twist all the wires in a tight bundle when ever possible to help cancel out the electric fields around the wires. He was saying they used twisted wire bundles in every part of the radar systems when it was possible.

See ya-Scott
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Old Apr 23, 2006, 05:16 PM
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I have used over 18" of wire for my motor-to-battery connections.

The conclusion that most of us have is that as long as your load isn't real close to your controller limits you should be fine. This gives you a cushion for any "spike" that could occur. I also twist my leads.

My Super Hornet has about 22-24" of motor-to-battery cable.
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Old Apr 23, 2006, 05:55 PM
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Nice hat!
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Old Apr 23, 2006, 05:57 PM
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LOL.....Thanks Gregg
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Old Apr 23, 2006, 07:09 PM
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Wow..look at those "demon" eye's..

Steve
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Old Apr 23, 2006, 07:12 PM
EDF Jet Jam 2015 , May 28-31
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LOL...man tough crowd
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Old Apr 23, 2006, 08:35 PM
Hey Now
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wow, nice airplane....
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Old Apr 24, 2006, 07:05 AM
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Quote:
Originally Posted by Jack Brewer
Long leads from battery is OK with reason. One of my brushless motors says distance from ESC to motor leads should be NO longer than 8".
That will be the Jetti then. I had 28cm leads from the pack to the ESC but the pack was a large 5s2p 66000 lipo. If you measure the RED lead inside the pack, its longer than 8 inches anyway. According to the MNF of the esc, there is no way you can connect a battery like this whatever you do

I had a Jetti 77 burst into flames using this pack, it got REALLY hot and was only pulling 62 amps. No way should a controller do this if used within normal operational conditions
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