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How do you stop motors in an emergency?
6086 18 2017-11-15
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Sunny D
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United States
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i had a crash yesterday and when I got to the drone 2 props had stopped (they were touching the ground), 2 were spinning and responded to throttle, but wouldn’t stop until after I picked it up.
I didn’t want to pick it up with spinning props, but also didn’t want to burn out the motors.
What should I have done (other than not crash)?
2017-11-15
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RedHotPoker
Captain
Flight distance : 50323
Canada
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A CSC will shut it didn't.

The same stick motion (down-in) you use to start the drone...


RedHotPoker
2017-11-15
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ALABAMA
Captain
Flight distance : 2038150
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Hold left stick all the way down and wait.
2017-11-15
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RedHotPoker
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ALABAMA Posted at 2017-11-15 11:18
Hold left stick all the way down and wait.

It has been noted, that a drone not sitting flat and upright, may not shut down, with our regular means.

It may take manually turning off the battery.


RedHotPoker
2017-11-15
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Peterx
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CSC = combination of stick commands the starter and the emergency brake for the motors. This is the safest way to turn off the air craft ´s motors.
2017-11-15
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RedHotPoker
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CSC may work, or it might not...


Here are the stick combinations for it.


Don't attemp these while on the ground, as your drone might do a 180* flip...

RedHotPoker


2017-11-15
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Geebax
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Australia
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Left stick down only works to stop the motors when the aircraft lands, it operates on the principle that the aircraft stops descending and is therefore presumed to have landed. But in a crash, particularly if the aircraft is upside down, even a CSC does not always seem to work. In that case, switch off the battery.
2017-11-15
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RedHotPoker
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Geebax Posted at 2017-11-15 14:53
Left stick down only works to stop the motors when the aircraft lands, it operates on the principle that the aircraft stops descending and is therefore presumed to have landed. But in a crash, particularly if the aircraft is upside down, even a CSC does not always seem to work. In that case, switch off the battery.

In that case, I was fortunate that my drone landed completely upside down.

& all though the motors kept spinning, it only scuffed the prop caps above the threaded centres.


RedHotPoker
2017-11-15
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Mark The Droner
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I'll just add a couple more minor details...

It takes a second or two for CSC to turn off the motors.  I guess it used to be instant but apparently there was a fw upgrade at some point a year or two ago that changed it.  

If the AC lands upside down and CSC won't work, I'd walk over and pick it up by the landing gear holding firmly with one hand, turn it right side up, then down left stick.  MHO.  Don't put your eye out.  
2017-11-15
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Sunny D
lvl.4
United States
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CSC was my go to, that’s what I thought was that emergency shut down. Either I didn’t wait long enough or it didn’t work.
Like I mentioned, after u picked it up I could just throttle it off, didn’t have to battery pull.
2017-11-15
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DJI Elektra
Administrator
China
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Sunny D Posted at 2017-11-15 18:30
CSC was my go to, that’s what I thought was that emergency shut down. Either I didn’t wait long enough or it didn’t work.
Like I mentioned, after u picked it up I could just throttle it off, didn’t have to battery pull.

You should hold the sticks about 3 seconds to stop motors. BTW, P4 has a different way of turning off motors.
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2017-11-16
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solentlife
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Latvia
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Just to add to others preceding posts, and because it is a P3 section ...

LEFT stick down only works if AC is truly stationary on the ground. Any slight movement and it will not work. It also takes up to 3 seconds to initiate. This is to avoid it happening in the air ... it detects descent of AC and knows its still airborne.

Both sticks IN AND DOWN will shut off motors in the air / on the ground ... but again needs a few seconds to act - this is to avoid accidental use of two sticks in the air.
My crash of my P3P in the tree few days ago and its tumbling through the  branches proved it works while still in motion.

If all else fails - my P3S wouldn't switch off by battery when it had its 'swim' - so pulling the battery out was only solution.

So 4 ways :

1. Left stick down is usual way

2. Both sticks in and down is the emergency cut

3. Switch off battery if 1 or 2 does not work

4. Pull battery out if none above work.

Nigel
2017-11-16
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Mark The Droner
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solentlife Posted at 2017-11-16 01:47
LEFT stick down only works if AC is truly stationary on the ground. ...

This is incorrect.  Left stick down works while holding the AC in your hand.  Yes, of course you have to hold the AC still.   Hand catchers know this and do it all the time.  

I'm not recommending this due to the danger of being close to the prop - I'm just suggesting it - as it certainly works and it works very nicely.  There are limitations, of course.  For example, on a boat in rough water, it very well may not work at all.  

solentlife - you have the floor...
2017-11-16
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Rigger73
Second Officer
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United Kingdom
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Simples......

RTFM.

On a serious note - you should have known - read and understood - the emergency shut-down procedure before flying.
2017-11-16
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solentlife
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Mark The Droner Posted at 2017-11-16 04:17
This is incorrect.  Left stick down works while holding the AC in your hand.  Yes, of course you have to hold the AC still.   Hand catchers know this and do it all the time.  

I'm not recommending this due to the danger of being close to the prop - I'm just suggesting it - as it certainly works and it works very nicely.  There are limitations, of course.  For example, on a boat in rough water, it very well may not work at all.  

Correct - it does work when Hand Catch ... the point is the stationary aspect.

There was a case of a guy in the media not so long ago who hand caught his pal's Phantom .... because it twisted in his hand and not stationary - he ended up in hospital.

I am no advocate of Hand Catching except in circumstances it suits better. So I relate to ground use.

Mark - please stop this childish ... You have the floor .... I'm not interested in one-upmanship or gamesmanship. We all have opinions - views ....

Nigel
2017-11-16
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FlightFilm
lvl.2
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Denmark
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Isn't it posible to turn off this feature to "turn off motors in the air" ?
Descending doing a law while flying backward to one of the sides,
and suddenly it crashes... :-(
2-11 11:27
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Mark The Droner
Captain
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What you described isn't likely and I've never heard of it actually happening, but I suppose it's remotely possible.  You can't disable the CSC feature, but IIRC, msinger was selling a gizmo that fit over the controller sticks to effectively disable it.  You might PM him and ask him about it.  
2-11 12:43
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solentlife
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Turn off CSC ?

The manouevre if CSC was turned off would be unbelievable ... imagine it ...

Left stick down gives max rate descent
Left stick left or right corner while full down ... means max rotation while descending
Right stick down gives full backward movement
Right stick full left or right while full down ... means max banked angled flight back ...

Mind boggles what would be actual full result !!

WOW ... love to see the video !!
2-12 04:00
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solentlife
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Don't attempt these while on the ground, as your drone might do a 180* flip...


Quote is about not doing a full CSC while on the ground.

Yesterday I did a test because an owner was saying his hub 'dots' ... the black and silver caps appeared to be 'wobbling' which got me to wanting to see if I could replicate. Yeh I know - crazy ... but anyway - my 'dots' were fine.
While doing this test - performed it twice  - I did the normal Left Stick only down. Fine as expected.

Next making sure I brought both sticks down together - I did the full CSC ... and was surprised at the result. First the AC never tilted, never moved at all, but the motors were sped up and a whine sound came from the AC as it was trying to 'force down' ... then motors stopped.

I do not recc'd CSC on the ground - I was just testing to see what happens

2-12 04:11
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