https://matteocampagna.com/en/registry/equipment/bow-torsion-arrow-direction Changes to this claim in Matteo Campagna's evidence registry: its status, its year-by-year history, revisions of the page. en-gb https://matteocampagna.com/en/registry/equipment/bow-torsion-arrow-directionThat twisting the grip moves the arrow is one of the few points where the mechanics are clear and the measurements on archers are thin. The models give striking figures: on a 166 N recurve bow, thirteen hundredths of a degree of difference from shot to shot is worth more than one ring at 70 m, and corresponds to under two millimetres of misalignment between arrow point and front stabiliser as seen at full draw. A test bench confirms it with no archer involved: on a mechanical launcher with a Japanese bow, varying torsion alone moves the point of impact at 28 m from one side of the target to the other. As early as 1990, on a shooting machine at 30 m, each degree of bow rotation moved the impact 15.8 cm in one direction and 21.9 cm in the other, a measurement the author used within his model. What is missing is the archer. High-speed video of sixteen world-class recurve archers shows that the bow does not rotate measurably until the arrow has gone, and that seven of them were probably holding it twisted while aiming: what matters is the twist set by the hand, and above all how much it changes from one arrow to the next, but nobody has measured it alongside the point of impact. The only measurement on people uses an instrumented kyudo bow: in nineteen practitioners the torsion exists, can be measured, grows with draw force and behaves differently in the last five hundredths of a second depending on how often the archer hits. Everything else concerns the Japanese bow or a model, and nobody has measured torsion and point of impact on the same shot of a recurve archer.claim:torsione-arco-direzione-freccia:revision:2026-09-22:2Tue, 22 Sep 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/bow-torsion-arrow-directionclaim:torsione-arco-direzione-freccia:new_claim:2026-08-31:riportatoMon, 31 Aug 2026 08:00:00 GMT