Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Loose motor after flight

Discussion in 'Pro/Adv Discussion' started by Gaylen Bartlett, Aug 2, 2016.

  1. Gaylen Bartlett

    Joined:
    Aug 1, 2016
    Messages:
    1
    Likes Received:
    0
    Greetings -

    I just recently purchased a Phantom 3 professional from an individual who had only flown it twice (allegedly). The story appeared to be true as everything appeared to be brand new. On my second flight I noticed that the top of aircraft cover had a wear mark in it, turns out it was from the propeller constantly hitting it as it rotated. After further inspection I discovered a completely loose motor were almost all of the screws were ready to fall out. It also turned out that all of the other screws on the other 3 motors were loose as well. Just wondering if this is common, a manufacturing error or something that might have happened before I purchased it. Everything is tight now and it seems to all be good, just curious if this is something that I should constantly be on the look out for!
     
  2. beamerbuilder1

    Joined:
    Jun 25, 2016
    Messages:
    186
    Likes Received:
    19
    I've heard of the motor screws possibly being too tight from the manufacturer which was causing cracks in the plastic shell, but haven't read anything about the screws being too loose.


    Sent from my iPhone using PhantomPilots
     
    Gaylen Bartlett likes this.
  3. msinger

    Approved Vendor

    Joined:
    Oct 30, 2014
    Messages:
    18,782
    Likes Received:
    5,528
    Location:
    US
    That is not a common issue, but it's not a bad idea to check the screws every X flights.
     
    Gaylen Bartlett likes this.
  4. N017RW

    Joined:
    May 2, 2014
    Messages:
    6,236
    Likes Received:
    1,606
    Location:
    Palm Beach Co.- FL
    Maybe the previous owner had prop guards and never sufficiently tightened after removal?
    I have never had mine come loose on any of my Phantoms.
    Fix the problem and inspect regularly.
     
    Dronason and Gaylen Bartlett like this.
  5. Oso

    Oso

    Joined:
    May 19, 2015
    Messages:
    2,514
    Likes Received:
    1,473
    Location:
    Sacramento CA
    As noted by @N017RW , it could have been previously installed prop guards. Since you've already tightened them, please check carefully that none of the motors were damaged. We've seen several reports of people removing prop guards and then using incorrect screws (too long) which end up damaging the windings. Hopefully this didn't also happen to you.
     
    Gaylen Bartlett likes this.
  6. Multicoptertec

    Joined:
    Mar 4, 2016
    Messages:
    1,083
    Likes Received:
    311
    Location:
    Apollo Beach, Florida
    I will add that if the screws were over tightened, the threads may be stripped. If they can be tightened, I would add a very tiny amount of blue loctite to keep them secure.
     
    Gaylen Bartlett likes this.
  7. N017RW

    Joined:
    May 2, 2014
    Messages:
    6,236
    Likes Received:
    1,606
    Location:
    Palm Beach Co.- FL
    Great advice above.

    But because DJI required longer screws for use only with prop guards we have to deal with these other cautions which can become overlooked. Since it has been a problem for so long one could assume everyone knows about it by now.

    I'm sure M-coptertech would agree that... be careful with LocTite around plastic. Use a type rated for plastic exposure or allow it to cure on the screw before using. The fumes, VOCs, etc. can make the plastic brittle and then your looking at a new shell or some home-brew repair techniques.
     
    #7 N017RW, Aug 2, 2016
    Last edited: Aug 2, 2016
    BigAl07 likes this.
  8. BigAl07

    BigAl07 Moderator
    Staff Member

    Joined:
    Jan 5, 2015
    Messages:
    2,362
    Likes Received:
    1,265
    Location:
    Western North Carolina

    I don't know about that last part. It was reported how loctite will actually MELT some types of resins used in our industry. I know that at one time BLADE quads were having prop issues and it was later determined and proven (in a verified laboratory setting) that it was due to Loctite being used on the screws. The compound was in fact weaking the plastic and causing in air prop failures.
     
  9. Multicoptertec

    Joined:
    Mar 4, 2016
    Messages:
    1,083
    Likes Received:
    311
    Location:
    Apollo Beach, Florida
    Loctite 425 is safe for plastics.


    Sent from my iPhone using PhantomPilots mobile app
     
    beamerbuilder1 and V tail like this.