The quality of the FlyingSticks shot simulator (as opposed to the ballistics simulator) is dependent on the quality of the computer's random number generator and the algorithm that subsequently generates two dimensional random normal numbers.
FlyingSticks defines the group size as a oval that on average will contain 5 out of six shots. It is then possible to confirm the calculator's performance by adjusting the archer's form so that the group oval precisely covers the 10 ring of a target face. This means on average 5 shots will score 10 and one shot 9 or less.
This action is possible from the Groups>Direct panel's "Calibration Check" button or the menu-bar's Action>Simulator_Calibration_Check item. Both have a toggle action to setup, then restore.
This action sets up FlyingSticks to allow the checking of the Grouping &Scoring Simulator and the quality of the computer's random normal number generator. In particular, the following are modified:
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Target inclination: 0° |
Target height: 1.3 m |
Wind gust: off |
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If the range is greater than 60 m or less than 15 m, it will be set to 30 m, otherwise it is left unchanged. Longer ranges cause a problem with the group height / width ratio (skew) progressively reduces, slowly at first then quickly to zero as the flight range is approached.
If the current round does not use a WA 10-zone face, then a WA Olympic Ranking Round is loaded with the modified range.
The face size is adjusted according to the round requirements. The groups oval will become a circle of the same size as the 10-ring. The apparent group skew will change when the impact angle deviates significantly from 90° as can happen at longer ranges.
The score shown in the bottom right corner of the Target Window and the Groups panel target view is the one to check as it is based on the current range and the number of shots for the longest range of the current round. Better still select a round with a single range such as the WA Olympic Ranking Round, and the Current Round details in the Groups panel will show the scores with greater resolution and the 95% certainty limits.
Select the WA Olympic Ranking Round. It has a maximum score of 720. Click the Groups>Direct panel's "Calibration Check" button. score (the average of 500 simulated rounds or 36,000 shots) should be close to 708 with 28 X's. By definition the grouping oval should on average enclose 5 out of six shots. This allows just 12 shots out of 72 to be outside the 10-ring, hence the 720 - 12 = ~708 score. The score is actually a little less as the out-of-10-ring arrows may be spread across the 7, 8 and 9 rings, but mostly in the 9 ring, so deducting 12.5 instead of 12 is more precise. Also the score could be pushed a little higher by the ...
Note the score will increase slightly with a larger arrow diameter due to the line touch rules where an arrow's score is promoted to the higher score if it touches the millimeter wide dividing line. This can be observed by changing the arrow diameter and inspecting the new score after Re-Sighting (the arrow diameter impacts aerodynamic drag and offset). Inspect the Current Round details in the Groups panel to observe the effect on the score.