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Overheating ESC

Posted by Paul Okelly on March 4, 2014 at 9:00am

looking for some help on an issue I have on a new build copter, it is a Hex 800 with Pixhawk Autopilot.

I have Mystery 5010 750kv motors 15 inch tarot blades, with Red Brick 30a ESC, pretty straight forward setup, 5000 30-45c 3cell lipo,

all went together great, all calibrated ok, took it for a test flight only couple foot of the ground to check for any issues, first noticed the lipo had dropped considerable voltage in the first 30 seconds, changed lipo and exactly the same thing happed but a ESC let go.

I noticed all the ESC's were very hot but I can not work it out, it had no weight on it so no stress, it took off with 5% throttle so I was not driving it.

Anyone have any idea what I may have done wrong

Many Thanks

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battery, esc, hex, motors, overheat, pixhawk, brick, red

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Replies

Emin Bu March 5, 2014 at 4:05am

that prop is waaaaay to big...biggest for that motor would be 12-13 inch and with 40A esc

do some basic calculations first

http://www.ecalc.ch/xcoptercalc.php?ecalc&lang=en

I would buy 5010 390KV motor with 17 inch props on 4S and get very long flight time if your multi is under 2kg with batts....30min+
- Paul Okelly > Emin Bu March 5, 2014 at 1:50pm
  
  Thanks Guys
  
  I have 6 HL W51 34 350kv motors with sec's but they only take 6cell batteries and I have 3c + 4c but limited money.
  
  Im trying to way up my best, but cost effective solution until I get some more cash, I just obtained my BNUC-s UAS license and it took all my money.
  
  really appreciate the help, thanks again.
  - Emin Bu > Paul Okelly March 5, 2014 at 3:07pm
    
    No,HengLee motors you have are perfect candidate to swing 18 or 20 inch prop on 4 S batt..a bit heavy they are but will be ok..6-kg hexacopter should fly that way longer than 15 inch on 6S...buy just one big 18 and 20 prop and do some motor testing on 4s
    
    You also have to learn how to input correct values into Ecalculator from post above for motors that are not listed and that will be acurrata as much is possible without real testing
    - Emin Bu > Emin Bu March 5, 2014 at 3:15pm
      
      hm...as of today or last few days seems only registrated users can change valuesof motor...
      
      http://www.rcgroups.com/forums/showthread.php?t=2112137
      - Paul Okelly > Emin Bu March 6, 2014 at 2:25pm
        
        Thanks for the info, I didn't know it was possible to run 4c on the HL motors because the spec says 6c, my 40amp esc should be ok with these do you think?
        
        thanks
        
        Emin Bu > Paul Okelly March 7, 2014 at 6:12am
        
        I think they will be ok..but any way do some mesure...here is some calculations for your hexa with those motors...you will probably need some ESC wit SimonK or BLHeli softwere on it to be able to adjust all parameters
        
        https://docs.google.com/spreadsheet/ccc?key=0AhR02IDNb7_MdEhfVjk3Mk...
        
        Paul Okelly > Emin Bu March 16, 2014 at 9:36am
        
        Thanks Emin
Paul Okelly March 4, 2014 at 4:12pm

Thanks Thomas, some real good info for me,, I will look at getting some better sec's, I have a 4c battery I can try, here is a spec of the motor if it helps, in case theres anything else you think I may have an issue will.

No problem if you haven't got the time.

http://mystery.en.alibaba.com/product/1223370064-220411551/Mystery_... again

Thanks again
- Paul Okelly > Paul Okelly March 4, 2014 at 4:16pm
  
  Im looking at these for ESC's
  
  http://www.ebay.co.uk/itm/6-x-40A-SimonK-ESC-for-Multirotor-Quadcop...