Welcome to PhantomPilots.com

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

Einstein's Theory of General Relativity

Discussion in 'Pro/Adv Discussion' started by joeyscic, Aug 31, 2016.

?
  1. Hit back wall of train

    23.1%
  2. Stay hovering where you launched

    76.9%
Multiple votes are allowed.
  1. joeyscic

    Joined:
    May 22, 2016
    Messages:
    5
    Likes Received:
    0
    If you are on a train travelling 240km/hr and you take off (inside the train) in P-Mode and hover, will your Phantom hit the back back wall of the train or stay hovering in the same spot?
     
  2. RedHotPoker

    Joined:
    May 3, 2015
    Messages:
    3,972
    Likes Received:
    1,365
    Location:
    Edmonton Alberta
    Stand up in landing plane, or jump up, in a bullet train... ;-)

    What? Did you think the volume of air would miraculously transport you... Or cushion the smack!! Ha
    You waited all this time, for this first post, How's the drone...?

    RedHotPoker
     
  3. joeyscic

    Joined:
    May 22, 2016
    Messages:
    5
    Likes Received:
    0
    I mean if the train is travelling at a constant speed, you can throw an apple in the air (inside the train) and it wont move backwards. With the drone in P-Mode it uses GPS to stay in the same spot. That stated it should hit the back of the train?
    Haha i was recently on a train carrying the drone and i pondered up such a thought :)
    The Phantom is great.
    PS any thoughts on patching this hairline crack with some super glue?
     

    Attached Files:

  4. RedHotPoker

    Joined:
    May 3, 2015
    Messages:
    3,972
    Likes Received:
    1,365
    Location:
    Edmonton Alberta
    Some adhesives use chemicals that may not be advantageous to your shell material. Can cause them to weaken or even deteriorate.
    There are other better ointments to soothe your split and chaffed baby. ;-)

    You need a Mr.Fixit remedy? JB Weld comes to mind.
    JB Weld | World's Strongest Bond
    Did that happen on the train? Hehe

    RedHotPoker
     
  5. joeyscic

    Joined:
    May 22, 2016
    Messages:
    5
    Likes Received:
    0
    I didn't know that. Ill look into a good product thanks for the tip.
    The crack has grown over a while, probably since i carry it in a normal backpack with no foam keeping it tight or safe, so gets knocked around a little.
     
  6. dsd317

    Joined:
    Nov 27, 2015
    Messages:
    182
    Likes Received:
    74
    How would GPS find its "Home" position if it's constantly moving?
     
  7. joeyscic

    Joined:
    May 22, 2016
    Messages:
    5
    Likes Received:
    0
    Very good point.
    So if it was in A-mode then, it would hit the back of the train unless the Phantom could fly as fast as the train.
     
  8. RedHotPoker

    Joined:
    May 3, 2015
    Messages:
    3,972
    Likes Received:
    1,365
    Location:
    Edmonton Alberta
    The planet is constantly moving too, our universe hurtles through space at light speed. ;-)
    We fly around the giant Sun star once a year, the planet does one revolution around its axis every day.

    RedHotPoker
     
  9. N017RW

    Joined:
    May 2, 2014
    Messages:
    6,256
    Likes Received:
    1,617
    Location:
    Palm Beach Co.- FL
    If you mean A-mode = Atti. mode... No, assuming the train car is enclosed, no drafts, etc.
    The air inside the cab is moving at the same speed as the train.
     
  10. joeyscic

    Joined:
    May 22, 2016
    Messages:
    5
    Likes Received:
    0
    Haha Yes of course. Thanks for clearing this up guys!
     
  11. Monte55

    Joined:
    Apr 26, 2014
    Messages:
    2,200
    Likes Received:
    517
    Location:
    Raymore Missouri
    How will the phantom get a gps fix with a metal roof in a train . Why is not every fly that takes off in a car moving slammed to the back window. Why are we not skidded across the surface of the earth as it spins. . How could a plane possibly fly and get anywhere against the rotation of the earth . This is all dumb.
     
  12. rene van der meer

    Joined:
    Oct 16, 2015
    Messages:
    377
    Likes Received:
    70
    The train has windows, so probably a GPS fix will be possible.
    If you take off in P-mode, I think the control SW will likely make a mistake, because of the fast changing position.
    I would not try that. In A-mode you could give it a try if you are more curious than attached to the drone ;)
     
  13. Opspeculate

    Joined:
    Feb 21, 2015
    Messages:
    8
    Likes Received:
    2
    GR has nothing to do with your thought experiment. It is Newtons laws of motion that will easily help you to predict the outcome.
    Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. So it will remain in the same motion and not hit the wall without a force acting to change the motion...
     
  14. WayneMHK

    Joined:
    May 19, 2016
    Messages:
    72
    Likes Received:
    26
    Location:
    Manhattan, KS USA
    Consider the opposite scenario. The aircraft is hovering inside a non-moving train. The train then begins to move......
     
  15. neven

    Joined:
    Jan 5, 2016
    Messages:
    342
    Likes Received:
    115
    Location:
    Zagreb, Croatia, Europe
    Are we really discussing this? ATTI mode - it will fly like in any other non-moving indoor space, P-GPS (hoover) will fly to the back of the train (if GPS signal is available).


    Sent from my iPhone using PhantomPilots
     
    Pharm likes this.
  16. Pharm

    Joined:
    Jun 14, 2016
    Messages:
    747
    Likes Received:
    272
    In P mode, you'd hit the back of the train (assuming you had satellite contact) because it would try to maintain it's original GPS position. If you were in Atti mode (assuming no air movement ir outside influences), it would hover in place.

    The key to this question, and the reason most people have gotten it wrong in the survey, is because they didn't pay attention to the details of the question. They missed the "P" part.
     
  17. Pharm

    Joined:
    Jun 14, 2016
    Messages:
    747
    Likes Received:
    272
    Thank you. That explains this conundrum perfectly......;)
     
  18. RedHotPoker

    Joined:
    May 3, 2015
    Messages:
    3,972
    Likes Received:
    1,365
    Location:
    Edmonton Alberta
    Go on, make others laugh too!! Hahaha

    Having my daily fun, without doing harm unto others... ;-)


    Conundrum you say, Hmmmm.
    Is there an app for those?
    image.jpeg
    You must be Catholic... ;-)

    RedHotPoker
     
  19. Pharm

    Joined:
    Jun 14, 2016
    Messages:
    747
    Likes Received:
    272
    The really bad thing here is that it can never be tested here in the U.S. because none of our trains travel in km/h. ;)
     
  20. RedHotPoker

    Joined:
    May 3, 2015
    Messages:
    3,972
    Likes Received:
    1,365
    Location:
    Edmonton Alberta
    Wouldn't know, I only fly, & never take the CN or CP rails...
    image.jpeg
    Any resemblance to my avatar is a conundrum to me... Ha

    RedHotPoker
     
    Pharm likes this.