Welcome to InspirePilots.com

Join the leading DJI Inspire community for free!

How accurate it the Sim with regards to CSC?

Discussion in 'Inspire 1 Discussion' started by Paul Joy, Jun 2, 2015.

  1. Paul Joy

    Joined:
    May 26, 2015
    Messages:
    77
    Likes Received:
    54
    So with mental winds here the last couple of days I'm grounded and have resorted to experimenting with the Pilot app simulator. One thing I've been messing with is what would happen if CSC were initiated mid flight. With P-GPS enabled and the aircraft hovering at 400 ft when CSC is initiated it obviously drops very quickly but as long as CSC is initiated again by 300ft the aircraft recovers without dropping below around 80 ft.

    There's no way I'm going to try this in actual flight but I'm wondering of anyone has ever had reason to do this for real?

    Would the aircraft stay stable in free fall as it seems to in the sim or would recovery from a free fall require the aircraft to recover from inverted flight, can it even do that?

    Just intrigued really.
     
    #1 Paul Joy, Jun 2, 2015
    Last edited: Jun 2, 2015
  2. sirnikolas

    Joined:
    Feb 24, 2015
    Messages:
    1,459
    Likes Received:
    988
    Location:
    Melbourne Australia
    That's gotta be the most craziest question I've seen here yet.

    And, I wouldn't mind knowing too :)

    I believe there's no way she'll fire up again. Plus, I reckon she'll roll like no tomorrow as soon as her props stop.
     
  3. lake_flyer

    Joined:
    Jul 17, 2014
    Messages:
    1,106
    Likes Received:
    343
    I know a Phantom will recover after a CSC in the air, provided it's high enough.
    So I think an inspire probably will as well. The fact that, in the simulator it still takes a few seconds to stabilise, makes me think it's accurate.

    It is really very simple to give an accurate descend in free fall (almost free fall, almost zero drag!) in the simulator, you can calculate that almost from the top of your head, if you happen to recall the simple formula (wasn't it v-gt or h=1/2gt(square))?
    Anyhow, I see no reason why the simulator would not simulate that correctly.
     
  4. lake_flyer

    Joined:
    Jul 17, 2014
    Messages:
    1,106
    Likes Received:
    343
    The flight controller is capable of recovering from any angle to horizontal, even upside down. In fact it can fly upside down as well (if we had manual mode). EDITED: I might be totally wrong here, we would probably need reverse on our props or prop adjustment.
    But since the Inspire produces no significant drag it will fall like a steel ball or a brick. So you have to CSC well before the minimum height which would be 400ft. It will still drop 300 ft before it's in stabile hovering. After that it climbs back to the height the new homepoint was set to.

    i wouldn't try it for real though. But I don't think it hurts when I practice it quite often in the simulator. When the time comes that I need it, I think I have a better shot at it. If it turns out to be wrong, so be it, at least I tried.
     
    #4 lake_flyer, Jun 2, 2015
    Last edited: Jun 2, 2015
    sirnikolas likes this.
  5. Mazz

    Mazz Moderator
    Staff Member

    Joined:
    Aug 9, 2014
    Messages:
    944
    Likes Received:
    585
    Location:
    NY
    Because the fall spins the props the opposite direction and, if there is not too much wind, equally, it should actually fall pretty straight. I cut the motors in the air on a lot of my quads when just playing around and they all fall fairly straight.
     
  6. lake_flyer

    Joined:
    Jul 17, 2014
    Messages:
    1,106
    Likes Received:
    343
    I guess you're right. The Inpire1 will probably fall straight down without turning upside down, after a CSC.

    I know the Phantoms can tumble around because of the drag the shell produces. And they tend to fall buttered side down :)
     
  7. damoncooper

    Joined:
    Mar 20, 2014
    Messages:
    3,451
    Likes Received:
    1,620
    Location:
    Boston, MA
    I think that's right. I've seen video footage of a CSC'd Inspire and it came straight down (scary fast) but didn't appear to be flipping over or around which at the time I thought a bit curious.
     
  8. Paul Joy

    Joined:
    May 26, 2015
    Messages:
    77
    Likes Received:
    54
    If anyone is crazy enough to try this just make note that after restarting the motors in mid air, the Inspire resets it's home point to that location and then the set maximum altitude increases as it starts from that height. So if home point is set at 100ft and max alt is 400 ft you'll be able to fly to 500 ft.

    Thankfully an RTH doesn't park it at 100 ft though, it still landed safely.

    Yeah I know, crazy but kept me amused today :)
     
  9. Soflms

    Joined:
    Feb 9, 2015
    Messages:
    336
    Likes Received:
    134
    Location:
    South Florida
    Should I know what CSC means? haha google was no help to me on this one. I think it has to do with cutting the motors like mazz said? But what does it stand for?
     
  10. LockMD

    Joined:
    May 14, 2015
    Messages:
    262
    Likes Received:
    136
    combined stick command ????
     
    turbodronepilot likes this.
  11. damoncooper

    Joined:
    Mar 20, 2014
    Messages:
    3,451
    Likes Received:
    1,620
    Location:
    Boston, MA
    Combination Stick Command

    ImageUploadedByTapatalk1433278262.368712.jpg
     
    sirnikolas and turbodronepilot like this.
  12. Soflms

    Joined:
    Feb 9, 2015
    Messages:
    336
    Likes Received:
    134
    Location:
    South Florida
    Cool, thanks for letting me know. Or should I say, CTFLMK
     
  13. Gary Bateman

    Joined:
    May 6, 2015
    Messages:
    60
    Likes Received:
    17
    I don't understand why people would want to move the sticks to that extreme in the first place. I only move my sticks approx 50% of the total movement this seems to be sufficient for speed, height gain, yaw and pitch.
     
  14. lake_flyer

    Joined:
    Jul 17, 2014
    Messages:
    1,106
    Likes Received:
    343
    exactly. A CSC command is not something you would do by accident, unless you're trying to fly upside down.
     
  15. Kilrah

    Joined:
    Feb 3, 2015
    Messages:
    1,879
    Likes Received:
    728
    We regularly teach new drone owners who are not RC pilots, and given sticks that have a certain travel they'll just use it without thinking about potential "side effects" if they aren't made aware of them.
    More stick = faster, and who doesn't want faster...