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Chris Davidson

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  1. Chris Davidson

    Swan-Song -- Math Rules

    David J, If I put JFK where Position A is designated, the lane stripe is blocked by the limo. This is the only way it works. It matches, using Robert West's designated path. My filming location for Towner. Greer in alignment with the concrete structure. JFK in alignment with the tree.
  2. Chris Davidson

    Swan-Song -- Math Rules

    Keep in mind: Robert West nor Chester Breneman ever stated that the Towner film was used in their survey work (only z frames). So what film was used to survey in StationC, Position A and the rest, before extant z161? None other than a film that captured the limo making the Elm St turn.
  3. Chris Davidson

    Swan-Song -- Math Rules

    Discount 30ft over (100 and 166.66 frame increments) @ 18.3frames per sec: 166.66/18.3 = 9.107 seconds 30ft/9.107sec = 3.294ft per sec = 2.24mph = speed of limo from CE884 (public version) Z161-z166 5frames 100/18.3 = 5.464seconds 30ft/5.464 seconds = 5.49ft per sec = 3.74mph = speed of limo from CE884 (final plat May/1964 version) z168-z171 3frames 5frame/3frame ratio = 1.66/1 = 166/100
  4. Chris Davidson

    Swan-Song -- Math Rules

    Once again, the 100ft mark would end at Station 334.5 = Robert West's path, not the other.
  5. Chris Davidson

    Swan-Song -- Math Rules

    Towner 167frames shifted to start at StationC: Discounting 30ft over 166.666frames: 30ft/166.666 = .18ft per frame CE884 (z161-z166 @18.3fps) = 3.294ft per sec = .9ft traveled in 5 frames = .18ft per frame traveled Start at StationC End at Station 299.0 = Frame 100 Jump the frame count by 33 = extant z133 Discount the span (no data) from z133-z166 = 33frames/30ft Accommodate the (Towner end- z133 beginning )distance span with path change. End at extant z166 = Shaneyfelt (not Robert West) path via extant zfilm. StationC + 100 + 33 + 33 = 166frames.
  6. Chris Davidson

    Swan-Song -- Math Rules

    And: (No WC data provided): (z161) - (z133) = 28 frames 33 frame count jump from z100-z133 28 + 33 = 61 frames added to z100 = start the data input.
  7. Chris Davidson

    Swan-Song -- Math Rules

    http://educationforum.ipbhost.com/topic/22692-swan-song-math-rules/?do=findComment&comment=372597 100ft / 3.294ft per sec (z161-z166) = 30.358... sec x 16fps = 485.73 total frames 486frames/18.3fps = 26.557 sec 30.358... sec - 26.557... sec = 3.8 sec x 16fps = 60.8 frames z100 + 60.8 frames = z161= start the data input. P.S. 3.292ft x 100 = 329.2 ft = the Station# beginning data entry for z161.
  8. Chris Davidson

    Swan-Song -- Math Rules

    Limo on film starts at z133. Data entry (CE884) starts at z161. Why? Because one frame rate must eventually catch up with the other. Limo on film should start with z100 corresponding to StationC. Difference between z100 and z161 = 61 frames.
  9. Chris Davidson

    Swan-Song -- Math Rules

    More of the removal process: Jump 33 frames. Remove 30.2ft (no WC data provided): Station# 329.2 (z161) - 299.0 (z133) = 30.2ft 30.2ft/33frames = .915ft per frame Converted to whole frames: .915 x (18/18.3) = .9ft per frame = Shaneyfelt = 11.2mph Throw in Myers 9.8mph average to sync: .9ft per frame x 16fps = 14.4fps/1.47(1mph) = 9.8mph http://educationforum.ipbhost.com/topic/22692-swan-song-math-rules/?do=findComment&comment=374647
  10. Chris Davidson

    Swan-Song -- Math Rules

  11. Chris Davidson

    Splice in Tina Towner Film

    Same frame jump, different source, per preceding post. Myers 167/ 22.8fps = 7.324...sec x 4.5 frame difference (22.8 - 18.3) = 32.96 frames Added on edit: Meant for Swan Song topic. Sorry about that.
  12. John, Viewing Towner's film, the only person I see (your red arrow from Martin) is the lady in red. https://drive.google.com/file/d/1LzGsRmWZUcKoYCITNvyX3kii6IaqsI7-/view?usp=sharing
  13. Chris Davidson

    Swan-Song -- Math Rules

    The distance from StationC to Towner end = 60.245ft The frame count = 94. The approx 6.18 frames for (Towner end to Z133) added in = 100.18 frames. That ratio becomes 60.245/100.18 = .601 = 100ft/166frames = .60ft per frame Starting from StationC, using the extant Towner film and adding the frame gap between (Towner end and z133), the zfilm count would start with frame 100, whereas it is now labeled as z133.
  14. Chris Davidson

    Swan-Song -- Math Rules

    Which will lead you back to this:
  15. Chris Davidson

    Swan-Song -- Math Rules

    https://drive.google.com/file/d/1utfgSG7vG9yOyXYvEmpnZ7Ql0obz-2IS/view?usp=sharing If you will notice in the graphic provided, the jump in the Towner film occurs at frame 83, which is half (167) of the total extant Towner frames. The jump in Towner (aligns JFK with the TSBD corner) is an adjustment for the gap between the Towner end and Z133. Final 20 Towner frames @ 12.5ft = 6.8mph @ 16fps z133-z149 - Station# 299.0 - 318.125 = 19.125ft = 13.01mph @16fps 13.01 + 6.8 = 19.81 /2 = 9.905 mph average 9.905 x 1.47 = 14.56ft per sec 5.625ft ( Gap between Towner end and Z133) / 14.56ft = .386....sec .386...sec x 16fps = 6.18frames Towner splice at TSBD corner = 7 frames missing via Myers. Like this: 83 + 7 missing = 90 167 - 90 = 77 + 6.18 = 83.18
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