Welcome to PhantomPilots.com

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

Litchi Autonomous Test Fail: Race Track

Discussion in 'Pro/Adv Discussion' started by DarkCargo, Jul 9, 2016.

  1. DarkCargo

    Joined:
    Jun 29, 2016
    Messages:
    12
    Likes Received:
    0
  2. alokbhargava

    Joined:
    Sep 28, 2015
    Messages:
    5,078
    Likes Received:
    1,634
    Location:
    San Francisco, CA
    You were flying too low, I was scared all the time. You should always consider 10-15' margin for position accuracy.
     
    freak42 and DarkDayz like this.
  3. strgazr27

    Joined:
    Feb 22, 2014
    Messages:
    70
    Likes Received:
    21
    With all due respect the app didn't fail. Your setting of waypoints and taking into account clearances did. Would have been a cool video.


    Sent from my iPhone using PhantomPilots mobile app
     
  4. Design-engine

    Joined:
    Mar 15, 2016
    Messages:
    61
    Likes Received:
    10
    Location:
    Chicago
    I want my money back after watching that
     
  5. Sagebrush

    Joined:
    Jan 3, 2016
    Messages:
    548
    Likes Received:
    155
    I have no idea what caused the second crash but suspect it has something to do with the first crash. Perhaps the debris that was caught in the guards.

    I've flown numerous Litchi waypoint missions. What really caught my eye was the wind on your coat when you were attempting to bring it home. I'm guessing 15 MPH? It's my experience that when flying Litchi missions in the wind the aircraft is challenged to maintain its course between waypoints. And that and flying near obstructions at 30 MPH.

    The other thing is the elevation you were trying to fly. If you take off and hover at head-height and check the elevation that your machine thinks it at, then fly off a hundred yards with some elevation change, and then return and hover at head-height again, you'll see that the craft doesn't think it's at 6'.

    Anytime I program an "iffy" waypoint mission in, I'll do the test flight in a conservative manner with my left index finger ready to abort. Keep in mind you're using a map that's created from a collage of photographs taken over a year ago and then stitched together with software (thus the coordinates can be a few meters off). And the vegetation is at least a year older. If fact, I don't see the white observation towers that your bird didn't hit in your mission map.

    SB
     
  6. Pharm

    Joined:
    Jun 14, 2016
    Messages:
    723
    Likes Received:
    257
    Pilot understanding of Litchi: Fail

    Pilot understanding of civilian GPS: Fail

    Pilot understanding of inertia on AC: Fail

    It appears maybe a rotor loosened after hitting the branches. Second crash looked like loss of a prop or engine.

    Overall assessment: Pilot error, not failure of Litchi.

    Don't feel too bad. We all screw up.
     
    Sagebrush likes this.
  7. Quadcopterpilot

    Joined:
    Nov 25, 2015
    Messages:
    257
    Likes Received:
    67
    Location:
    Grimsby, Ontario, Canada
    Not being a smart *** but thanks for the lesson.
    1. GPS/waypoints not as accurate as you may think.
    2. 30mph is too fast for that tight a maneuver.
    3. 16ft altitude is too low without better accuracy.
     
    Digdat0 likes this.
  8. Roamer105

    Joined:
    Mar 10, 2016
    Messages:
    128
    Likes Received:
    25
    Whatever you did - it is not the Litchi app that failed here. I have flown many complex waypoint missions with both Autopilot and mostly Litchi. I NEVER found fault in the app. It always turned out to be an issue with my planning or mission definition. The Phantom will reach a particular waypoint within the margin of GPS accuracy aided by barometric altimeter. This will almost always put the drone within a sphere of about 30 feet of diameter. If you cut it closer than that - you are taking a chance and it may go bad. Here is an example of a complex Litchi mission in difficult terrain and significant elevation changes. Check out this Youtube video of one of those missions:




    Sent from my iPad using PhantomPilots mobile app
     
    Digdat0, Sagebrush and Pharm like this.
  9. Fat Daddy

    Joined:
    May 14, 2016
    Messages:
    133
    Likes Received:
    40
    Location:
    Nevada
    So, if Lichi isn't the right tool for the job, what would be? It's a cool idea. Would waypoints be better? Autopilot? It doesn't seem like this would be unreasonably difficult.
     
  10. impilot51

    Joined:
    Dec 3, 2015
    Messages:
    405
    Likes Received:
    147
    I don't think there is a product out there that that will do this at the accuracy required combined with the aircraft speed and altitude. There is a lot of combined error, between GPS error, barometer error, etc.

    Perhaps multiple takes, done at a slower speed and then sped up in your editor of choice will allow for a finished product that conveys what he is trying to convey. But I seriously doubt that you are going to get it in one take, on a windy day, at full speed with today's technology at this price point. Perhaps a Matrice 600 is up to that challenge, but I don't think a Phantom is.
     
  11. happydays

    Joined:
    Jul 5, 2013
    Messages:
    1,845
    Likes Received:
    655
    Location:
    Warrenpoint, Ireland
    Why didn't you just fly it manually? It's not a difficult course after all.