[NSRCA-discussion] APPARENT GEOMETRY (PARALLAXED VIEW)

Tue Apr 10 04:37:46 AKDT 2007

What I did to help train my pilots and judging eye was to walk to end of flight box, staying on judging side of flight line at contest, and watched 4 or 5 skilled pilots flying their center maneuvers. It produced the same visual effect on their center maneuvers as standing at center of box and looking at end maneuvers. (Realize this only applies to the center maneuvers for eyeball training) the assumption is the center maneuvers are flown normally more accurately than end box maneuvers. The added bonus was I could see if the pilots where doing correct true verticals and horizontals at my end of the maneuvering box. The surprising flaw I noticed was some would not fly their bottom horizontals flat. Some would also not pull a true vertical. Occasionally I would see a pilot off as much as 20º from true vertical. They would often have a slight climb in them as they approached the end of the box.  I found going out and experiencing was my best teacher. Class rooms talks are great but they can't reproduce all of the geometry that an experienced judge gains from sitting the flight line year after year.  When contests had more man power to run a contest it was discussed about having turnaround judges at one time.

    Del
  ----- Original Message ----- 
  From: Ed Alt 
  To: NSRCA Mailing List 
  Sent: Tuesday, April 10, 2007 7:04 AM
  Subject: Re: [NSRCA-discussion] APPARENT GEOMETRY (PARALLAXED VIEW)

  And all the lines will bend and not appear straight,  Hey, I do that already!

  Ed
    ----- Original Message ----- 
    From: Fred Huber 
    To: NSRCA Mailing List 
    Sent: Monday, April 09, 2007 10:59 PM
    Subject: Re: [NSRCA-discussion] APPARENT GEOMETRY (PARALLAXED VIEW)

    The responsibility of the pilot s to PERFORM the corret geometry despite the parallax view.

    The responsibility of the judge is to learn how the parallax will make the correctly flown maneuver look.

    About the only way I can think of to show the effects of parallax on a correctly flown turnaround maneuver would be to film it from as close to perpendicular to the flight path as possible, and at the judges' location at the same time. then play the tapes sumultaneously at a judging seminar.

    At the appx 45 to 55 deg observation angle of the judges station, a 45 deg up/down line (half cuban) would appear steeper than what is actually being performed.  If it looks like a 45 from the judge's station (holding up a 9th gradeer's geometry class triangle), its too shallow.  The appearance of 60 deg (same method) would be closer to actually being the 45 deg line.

    Note that if the pilot doesn't make use of the full box, the parallax will be reduced... and that's not downgradeable.

    Verticals should still look vertical.
      ----- Original Message ----- 
      From: rcmaster199 at aol.com 
      To: nsrca-discussion at lists.nsrca.org 
      Sent: Monday, April 09, 2007 10:11 PM
      Subject: [NSRCA-discussion] APPARENT GEOMETRY (PARALLAXED VIEW)

      A question has been posted from an IMAC gentleman (who is trying to write better IMAC rules) as to how Pattern people fly and judge skewed appearance of maneuvers at box ends or in center when tall maneuvers (Hourglass, Vert Sq 8, Rolling Ess, etc) are involved. 

      Some of us have searched the book and found no wording written that describes what the pilots' responsibilities and the judges' responsibilities are in the performance of the skewed apparent geometry. There is a statement in the Judges Training tape in regard to end maneuvers.... that these will appear different even when accurately flown. The oness is essentially on the judges to know how the True Geometry should appear when flown at an angle to the eye, and must not downgrade for Apparent or Parallaxed appearance difference.

      Spoke with Don about this earlier today and we decided to present the question to the group and get some conversation going. We should be explicit in the book regarding how such Apparent Geometry should be treated....ie- what is the pilot's responsibility and what is the judge's. Description improvements could be written over the next couple rule cycles.

      The pilot's responsibility may appear easy.... they simply need to fly precise geometry per the book. True enough, BUT.....consider what is actually flown, especially by the top guys, and what scores well. These are not necessarily as precise as one might think. The better pilots tend to fly purposely flawed maneuvers that give the impression of precision. 

      MattK

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