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Ground landing charts & stats (altitude, speed, & time)

Discussion in 'SpaceX' started by EvanLin, May 2, 2017.

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  1. EvanLin

    EvanLin Member

    Joined:
    Oct 9, 2016
    Messages:
    60
    Location:
    Asia
    Made few simple charts based on NROL-76 video with an interval of 10 sec.
    Would really like to have the horizontal position to know more about how first stage went through.

    Main Engine Cutoff @ 140s, 66km
    Boostback Burn @ 156-200s, 86-132km, 1580-840m/s
    Entry Burn @ 431-456s , 68-39km, 1390-750m/s
    Landing Burn @ 509-540s, 5-0km, 320-0m/s


    NROL-76.png
     
  2. sandpiper

    sandpiper Active Member

    Joined:
    Sep 25, 2014
    Messages:
    2,503
    Location:
    Ontario, Canada
    I wonder if the booster motion is almost entirely out and back, or if there is some significant lateral motion? If there's isn't you could do the following:
    - calculate the vertical component of the velocity by numerically differentiating the altitude curve
    - vector out the horizontal component of the velocity
    - integrate the horizontal component over the course of the flight

    If the math finds you arriving close to the launch position, you could scale the horizontal scale to fudge it. That would also (albeit a bit inaccurately) compensate out a small amount of lateral velocity.
     

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