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Thread: Troubleshooting help

  1. #1
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    Troubleshooting help

    Hoping to get a little trouble shooting help...

    Was essentially maiden-ing (3rd total flight, first fpv) when about :30s in I seemed to lose power. After a 2 hopper deadstick landing, I found that the bullet connector on the motor had come disconnected from the wire. It looks almost as if it came un-soldered.

    Here are some pics:



    Here's the video.
    At about :23s you can hear just as I start to throttle back just a smidge from full, something happens. It sounds like the props comes loose (it didn't; it's on there tight as a drum), and the amp draw skyrockets from a solid 34 amps while wide open to 99 amps and then levels in the 70's (top left corner of OSD). This is when I realized I wasn't getting power and back off to 0% throttle. I gave it a bit more to see if there was anything there, it goes to 30 amps, but sounds funny, so I back off again. 3rd try you can hear the tell-tale sound of only 2 of 3 motor leads connected. :/

    The motor is an M2815 KV1280 on a 60 amp ESC. Im running a Master Airscrew 9x7 prop.

    After I re-soldered the bullet connector, the motor/ESC appears to run fine again. That bullet is much looser than the others though, so perhaps it vibrated apart slightly enough to cause it to arc and that de-soldered it? I need to do some longer full throttle bench tests to be sure though. :/

    Anyone have any ideas?


  2. #2
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    After running some calc's, I think I may be over proping the motor and the current draw was just too much; gonna test with a 9x6 tomorrow; probably could go with a 9x5.

  3. #3
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    What size motor?
    I had similiar issues with a solder joint on Deans - or the conn itself.
    I run a 75amp ESC now w/10x6 props on my Zeph.
    "Truly superior pilots are those who use their superior judgment to avoid those situations where they might have to use their superior skills"- Author unknown

    KF7TRX

  4. #4
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    Quote Originally Posted by Scotttu View Post
    What size motor?
    I had similiar issues with a solder joint on Deans - or the conn itself.
    I run a 75amp ESC now w/10x6 props on my Zeph.
    The motor is an M2815 1280 Kv on a 60 amp ESC. Im running a Master Airscrew 9x7 prop.

  5. #5
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    Probably a cold solder joint.

    I'd heat them all until the solder flows nicely, try it again.

    My deans connector was arcing and with the 10x6's I drew about 75amps at take off but once i went to XT60's - same at launch but only about 21amps on 50% throttle or so - level flight.

    High current is either a cold solder joint or not a good enough contact......9x7 should work fine with a 60amp.

    Now that I see the photos on my computer vs Iphone - Yeah that's a cold solder joint.
    "Truly superior pilots are those who use their superior judgment to avoid those situations where they might have to use their superior skills"- Author unknown

    KF7TRX

  6. #6
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    I re-soldered everything and dropped down to 9x6, and she ran like a beaut.

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