[NSRCA-discussion] Help - Toasted ESC + Battery

[Jas]

Sadly you need a Jeti to run the Hacker Q motors, the Castles and OS won't work. There might be others but I only know of the Jeti

Sent from my iP

> On Jul 15, 2014, at 12:01 PM, Jeff and Claire via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
> Unexplained ESC problems happened two weeks in a row-  any ideas why?
> 
> Last week- motor shut off near end of flight as if ESC hit low voltage
> cutoff.  Only the ESC would not reset. Resulted in off-field landing and
> broken out landing gear.  Got to the plane and the ESC was doing the slow
> beep (which I think is normal when it's been left on and Tx is off) as
> opposed to the type of beep indicating it hit low voltage cutoff. Battery
> pack still had 26% remaining, no low cells.  Hacker Q80-11s, Castle HV80
> ICE2 (3 years old, unknown # flights), SkyLipo 4400
> 
> So I repair the landing gear and install a new OS 1100HV ESC. 1st flight
> everything seems fine. Early into the second flight there's a loud screech
> during power-up after pulling from a vertical down line. Again, no power.
> (was not using brake, had not tried it yet).  Swung around to land and
> opened the canopy to find new ESC burnt to a crisp and battery toasted too.
> This time Hobby People 4500's, a month old with 15 cycles.  Checked balance
> connectors to find one 5s had one cell left, the other had 2 cells left.
> Blobs of solder fell out as I removed pack from plane.  Not sure, but maybe
> these came from the soldered connections inside the pack. Can see a blob
> still stuck inside.  
> 
> Checked motor using same Castle ESC from last week, and it seems to run
> fine.
> 
> Can what appears to be an operating motor cause an ESC to burn up?  
> Can a lipo pack cause an ESC to burn up? 
> Or did the ESC just fail and take the battery with it?       
> 
> Any ideas why this happened or how to avoid in future? Ok, all but the ones
> about switching to YS!  :) 
> Jeff Worsham
> <Toased OS ESC_2.jpg>
> <Toasted ESC_3.jpg>
> <Toasted OS ESC_1.jpg>
> <Toasted OS ESC_4.jpg>
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