COMPULSORY FIGURES AND DIAGRAMS ("OLD" AKA)

This page contains:
- the text of Chapter VI,
- Appendix F (intro) and a scan of the illustration by Ruedi Weisskopf
- Appendix H (grid)
all from the AKA-rulebooks 1 to 4.
(For the STACK-rulebook I made a different explanation of the "old" grid ).
The new grid can be found here

VI. COMPULSORY FIGURES AND DIAGRAMS

This section contains diagrams of compulsory figures for use in the Individual and Team Precision Events.
They are not intended to be all inclusive nor are they the only figures that may he used for sport kite competitions.

Organizers and Competitors are encouraged to create and submit new and challenging figures to the Sport Kite Committee for review. All compulsory figures submitted must be drawn on the grid illustrated in Appendix H. All compulsories should be accompanied by a written description, if possible.

Compulsory Figures should be designed to test specific skills. It is recommended that the figures be short and simple. Considerations for developing meaningful figures are timing, spacing, formation flying, and landings for team figures; and accuracy, proportion, speed control, and landings for individual figures.

When Compulsory Figures not in the rule book are selected for use, diagrams of those figures must be provided by the Event Organizer to competitors 30 days prior to the competition.

The Grid

The backdrop for each figure is a grid to be used as reference for the appropriate size and location of the figure within the wind window.
All compulsories are drawn on a grid consisting of 10 units top to bottom and 20 units from side to side.

Judges are looking for the figures to be flown in accordance with the grid defined above. All hard angles are expected to be as crisp irrespective of kite type. Utilization of one kite type over another will not result in a higher score due to the flight characteristics of that particular type.


APPENDIX F

Optional Compulsory Figures Description

The following descriptions are optional descriptions that may be used for figures in the rule book. They represent a progressive vision of what may in fact become the standard for precision events in the future. Event Organizers may choose to specify that these narrative descriptions will be used for a particular class or competition event, with the standard 30 days advance notice to affected competitors.

All written descriptions assume a flying line length of 125' (Note: All specific references below that are listed in "feet" may also be viewed as a "percentage" of the 10 unit by 20 unit wind window.).

"The actual configuration of the wind window as depicted in the following illustration (below) is provided courtesy of Ruedi Weisskopf." (text rulebook)
Drawing by ruedi weisskopf

Appendix H, grid

the old grid


NOTES (not included in the AKA rulebooks)

Combining the suggested flying surface in the drawing of Ruedi Weiskopf
with the measurements mentioned elsewhere in the rulebooks.
results in the drawings below, which I have used as a basis for the explanation on the "STACK grid".

Notice:
- that the two top corners of the old grid don't exist,
- that the horizontal flying path at ground level (or better half a kite higher) is much longer than the top (100%) flying path,
(and that the circles in the drawing from Ruedi Weiskopf, running from the ground point edges left and right
never would coincide with the horizontal lines on the grid)
- that a vertical according to the grid should be a flying path curving -strangely- outward form the point of view of the flyer.
- and that the maximum width of the grid (100%) equals a angle of 53 with center window. This angle is only correct at ground level.
Calculations of other percentages-to-angles are not simple; f.i. 50% does not equal 26.5!

Note that percentages (feet) are measured on the straight line at the flyer's position and degrees along the half circle. (in this respect the drawing of Roy Reed is not right).


combined

Measurements:
On a flying field of 105m square, with a public boundary of 5m
the flyer is placed in the middle.
The lines used are 125 feet (38m).
The quarter sphere ranges from 90 to left, right and top.
In the rulebooks no decisions have been made considering the positioning of pairs and teams,
what to do regarding to shorter than 125 feet lines
and whether the wind window will "move" with the pilot!


all angles

A comparison between the "grid" and the angles between flying lines and wind direction;
the 53 as in the previous figure.
If the grid "moves" with the flyer, top two corners of the are not reachable. If the grid is static (say fixed at the moment the flyer starts a figue)
the whole grid is reachable, but only by walking sideways!



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