Caught on Camera: Weirdest Drone Crash; Motor Came off - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-12-2016, 08:12 AM   #1
hk4fvj
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Caught on Camera: Weirdest Drone Crash; Motor Came off


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Motor disengaged after more than ten minutes of perfect flight. See video on YouTube. I will post additional pictures later:

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Old 10-12-2016, 08:41 AM   #2
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

That happened to one of the guys here. The C-clip that holds the motor shaft in place was missing. The only thing holding the motor together was the magnetic field.
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Old 10-12-2016, 09:18 AM   #3
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

Or if you have whacked the motor, many brands have a press fit of the bell to and internal shaft. I have had vortex motors, Cobras and xnova bells pop off when press fit loosened.
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Old 10-12-2016, 11:17 AM   #4
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

From what you see the entire motor departs, including the retaining screws. If I had to guess, the piece that came off first may have been from the arm where the motor is bolted down and it then failed completely. Difficult to tell as there appears to be a prop blade separation at the beginning and when the motor departs it looks intact. Wonder if another prop separated and impacted this one.

If another blade came apart it would cause a severe vibration, which may have affected the stability system.

Unfortunately, this also reinforces one of the major disadvantages with this type craft, ie. the lack of redundancy or capability of control with loss of a power system. with helis or planes flight can still be controlled if the motor fails. I would think one with more motors, or double props each corner, would better tolerate the loss of one system, but then you get into much greater complexity and cost.
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Old 10-12-2016, 01:23 PM   #5
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

I've had that happen with my emax motors, one of them the motor housing came off, this was after a lot of flights. The C Clip just let go about 4 mins into a flight and the quad spun in and was undamaged except for the motor. I found the motor housing and blade, undamaged, put it back together and just replaced the C clip, still flying it now...

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Old 10-12-2016, 09:12 PM   #6
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

Quote:
Originally Posted by HAL9KPCM View Post
That happened to one of the guys here. The C-clip that holds the motor shaft in place was missing. The only thing holding the motor together was the magnetic field.
Hey!!! That is exactly what happened to one of the 250 drone fliers at my club as well!. After we found the motor, it popped back on. It took him a day or 2 to find an e-clip that fit, and it flew again. I'm guessing poor quality control?
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Old 10-12-2016, 09:27 PM   #7
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

Hi Guys
Thanks for all the comments. The motor departed wit the plastic base and the four screws. Basically the plastic body did not resist. The four blades were balanced using the Dubro balancing machine prior to maiden flight. Never perceived any vibration. I can only think the body is made of a cheap plastic but is only my feeling.

It was the fifth flight of the year and all previous were excellent; also at the moment of the accident, it had been flying for 12 minutes, which make things even weirdest.

No blade broke at all. The black Silhouette that resembles a half blade is a picture artifact, I guess retention by the CCD element of the camera, something similar to retina retention.

I have attached three additional picture that were not included in the original video. They do show how the motor with the retained blade, atatched four screws and plastic base falls hopelessly down to earth while the drone try to remain stable. Finally it goes nuts after almost three-five seconds and falls to shatter.
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Old 10-12-2016, 09:33 PM   #8
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

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Originally Posted by HAL9KPCM View Post
That happened to one of the guys here. The C-clip that holds the motor shaft in place was missing. The only thing holding the motor together was the magnetic field.
Hi there
In this case, the full motor altogether with the propeller the four screws and even the plastic base disengaged.
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Old 10-13-2016, 09:55 AM   #9
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

Ah, not counting the half blade in the frame that's what I thought and noted in my original post. Did not see the base, though.

Sounds like the arm cracked. Could be a design or manufacturing issue, (drilling may have separated layers or created a sharp edge) or tightening the screws may have induced stress into that area. Unfortunately it ripped the wires out when departing so that motor is toast.
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Old 10-13-2016, 10:01 AM   #10
hk4fvj
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Re: Caught on Camera: Weirdest Drone Crash; Motor Came off

Quote:
Originally Posted by Cougar429 View Post
Ah, not counting the half blade in the frame that's what I thought and noted in my original post. Did not see the base, though.

Sounds like the arm cracked. Could be a design or manufacturing issue, (drilling may have separated layers or created a sharp edge) or tightening the screws may have induced stress into that area. Unfortunately it ripped the wires out when departing so that motor is toast.
Not only that motor. After crashing, the remaining three motors had all the cables pulled out by the impact. I had to order the four motors and the full body.

I was initially reluctant to fix it specially because the 2.4 Ghz Tx was also damaged, however I did fix it with a microscope.
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