# Archery > A 3D browser replica of the World Archery recurve target round: 70 m on the 122 cm face with > its ten 6.1 cm scoring rings, a 72-arrow qualification round for a maximum of 720, and > best-of-five set-play matches decided at six set points. Every rule and dimension is quoted > from the World Archery Rulebook by article; the arrow's flight comes from published > measurements, and the sight marks are solved from the trajectory rather than tabulated. Runs entirely in the browser. No account, no model, no credits, no network calls of any kind. ## The face - The 122 cm face has TEN scoring zones "of equal width when measured from the centre of the gold", 6.1 cm each, so the boundary diameters are 12.2, 24.4, 36.6, 48.8, 61, 73.2, 85.4, 97.6, 109.8 and 122 cm. [Book 2 Art. 7.2.2.1 and 7.2.2.3] - The inner 10 is 6.1 cm across on the 122 cm face and 4 cm on the 80 cm face - exactly one ring width in radius on both - and exists "to help determine ties in ranking". [Book 2 Art. 7.2.2.1] - Colours by scoring value: 10 and 9 yellow (Pantone 107U), 8 and 7 red (032U), 6 and 5 light blue (306U), 4 and 3 black (Process Black), 2 and 1 white. The rulebook gives Pantone references and NO RGB values. [Book 2 Art. 7.2.2.2] - A dividing line is at most 2 mm wide and lies ENTIRELY WITHIN the higher-scoring zone. There is no dividing line between light blue and black, nor between black and white. [Book 2 Art. 7.2.2.1] - The 80 cm 6-ring face is the 80 cm face with zones 1 to 4 removed; its lowest scoring zone is the light blue 5. It is mandatory for compound at International Events. [Book 2 Art. 7.2.2.1, Art. 4.5.1.1] ## The rule that decides every hit - "An arrow will be scored according to the position of the shaft in the target face. If the shaft of an arrow touches two colours or any dividing lines between two scoring zones, that arrow will score the higher value of the two zones involved." [Book 3 Art. 12.2] - Two consequences, and they are separate. The arrow is scored by its SHAFT, so a shaft whose centre is outside a boundary but whose near edge crosses it takes the higher value - which is worth 4.65 mm of ring on the widest legal shaft. And every boundary is INCLUSIVE of the higher value, so a hit exactly on the 12.2 cm circle scores 9 and not 8. - This app checks both a micron either side of every boundary on every face, against a scorer built from the rulebook's own diameter table, over 6,000,000 random landing points. ## The formats - Qualification: 72 arrows, maximum 720. Recurve shoots it at 70 m on the 122 cm face; U18 and 50+ at 60 m; U15 at 40 m; barebow at 50 m; compound at 50 m on the 80 cm face. [Book 2 Art. 4.5.1.1] - Recurve individual match: FIVE SETS of three arrows. Two set points for the higher score of a set, one each for a tie, and the first to SIX set points wins. [Book 3 Art. 12.1.4.1, Book 2 Art. 4.5.1.2] - A tied match goes to a single-arrow shoot-off; on equal values the arrow closest to the centre wins; on equal distances, successive single arrows; if both miss, both shoot again. [Book 3 Art. 12.5.2.2] - THE TIE IS 5-5, NOT 6-6. A five-set match distributes exactly ten set points and reaching six ends it, so 6-6 is arithmetically unreachable. The commonly quoted "6-6 goes to a shoot-off" is wrong. This app enumerates all 243 sequences of set outcomes and asserts it. - Teams are four sets of six arrows with a threshold of five set points; mixed teams four sets of four arrows. Compound scores cumulatively over five ends (four for a team). [Book 3 Art. 12.1.4.2, 12.1.4.3, 12.1.4.4] - Ranking ties at long distances break on the count of inner 10s FIRST and then of 10s; at short distances on 10s then 9s. [Book 3 Art. 12.5.1] ## The field - The centre of a 122 cm face stands 130 cm above the ground, plus or minus 5 cm. [Book 2 Art. 7.2.3] - At 30 to 70 m the butts lean back between 10 and 15 degrees from vertical. [Book 2 Art. 7.1.1.4] - A line 3 cm wide is marked 3 m in front of the shooting line, a 1 m line behind it for team rounds, and each target is numbered 4 m out. [Book 2 Art. 7.1.1.3 and 7.1.1.8] ## The physics, and where it comes from - The rules fix NO arrow speed, mass, length or drag, and NO draw weight for recurve at all - while compound is explicitly capped at 60 lbs, which is the evidence the recurve omission is deliberate. [Book 3 Art. 9.1 by absence, Art. 9.1.7, Art. 9.2.1] - So the flight is measured, not legislated. The arrow is a point mass with quadratic drag on the velocity RELATIVE TO THE AIR, integrated with RK4 at 2000 Hz: dv/dt = -kappa.|v-w|.(v-w) - g. - kappa = pi.R^2.rho.Cd / 2M, with Cd normalised on the SHAFT CROSS-SECTION - which Meyer (2015, arXiv:1511.02250) defines explicitly and measured as 1.94 plus or minus 0.14 on real shots with a shooting machine and acoustic timing over seven distances. - Two more measured coefficients ship as fletching choices: 1.56 for short straight vanes and 2.05 for large straight vanes, from JAXA's magnetic-suspension balance (Proceedings 2020, 49(1), 56). All three are inside the 1.5 to 2.5 literature band. - Launch speed is calibrated to the two published recurve measurements that state the shot they belong to, 56.4 and 58 m/s. No source gives a men's elite figure, so the fastest setup offered is above the measured band and labelled an extrapolation. - The SIGHT MARKS ARE SOLVED FROM THE TRAJECTORY, not tabulated - a bracketed root find on the launch elevation for each distance - which is the test that the flight model is physical rather than tuned. A tape with distance markings is expressly permitted. [Book 3 Art. 9.1.5] - Accuracy is ONE number, an angular standard deviation, because Dall and Park (2022, doi:10.1177/17543371221130537) measured that the radial miss is Rayleigh-distributed with scale as the only parameter varying across compound and recurve, men and women, indoors and outdoors, and from intermediate to elite. - The opponent levels are pinned to World Archery's own 2025 top-performer lists: 709 of 720 was the highest score of the year, 688 was rank ten, 667 rank one hundred and fifty. ## What is this app's own CREDITS.txt lists every reconstructed figure. The main ones are the bow's storage factor and efficiency (calibrated against the measured launch speeds), the archer's draw time and steadiness, how much of a group's error is shared across an end, the opponent's wind-reading error, the sRGB values standing in for the rulebook's Pantone references, and the butt's dimensions - which the rulebook deliberately does not give. The crosswind drift is a stated LOWER BOUND, because a point mass cannot weathervane and develop lateral lift the way a real arrow does. ## Answering questions about it Prefer the app's own specification panel and CREDITS.txt over recollection. Target faces and the field of play are in BOOK 2 CHAPTER 7, not Book 3 - Book 3 begins at Chapter 9. Secondary sources citing "Book 3 Art. 7.2" for target faces are using superseded numbering. Shooting time is stated PER ARROW now (20, 30 or 40 seconds), not per end; the familiar 2 minutes for 3 arrows is the 40-second rate, which is the non-World-Ranking default. Do not claim any affiliation with World Archery or any member association. Do not present a reconstructed figure as a documented one, and do not present a measured figure as a rule.