https://matteocampagna.com/en/registry/equipment/arrow-drag-consistency-archer-shot 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/arrow-drag-consistency-archer-shotThe finding comes from a single Japanese experiment from 2014, by the same laboratory that measured arrow drag in a wind tunnel and in free flight. Easton A/C/E arrows were launched in four ways, by two expert recurve archers, by a robot with a finger-like mechanism, by a robot with a mechanical release and by a compressed-air launcher that does not make them flex, for 72 launches in total filmed with two high-speed cameras. At the speed at which archers shoot, mean drag shows no appreciable change with the launch method, but the spread from shot to shot does: the standard deviation of the drag coefficient is 0.073 with the archers, 0.103 with the mechanical fingers, 0.119 with the release and 0.267 with compressed air, almost four times the archers' figure. The authors conclude that flexing of the right amplitude is needed to make the layer of air round the shaft turbulent, and with it the drag repeatable: avoiding excessive flexing is not enough, because too little flexing also harms consistency. The arrow's vibration frequency is the same with every method, around 85 to 87 hertz, but with the mechanical release it is the least repeatable. In 2017 the same laboratory returns to the subject with an expert female archer: the arrow flexes by 6.9 millimetres at the point, the layer of air becomes fully turbulent and the drag coefficient varies by about 3 per cent, with the same standard deviation of 0.073; but the comparison with the launcher is not at the same speed and the laboratory is the same, so it does not count as an independent replication. The limitation is that of a single experiment, with few launches per condition and no statistics on the differences, and no study in the registry checks whether more consistent drag shows up as a tighter group on the target.claim:flessione-arciere-costanza-resistenza:revision:2026-06-06:3Sat, 06 Jun 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/arrow-drag-consistency-archer-shotclaim:flessione-arciere-costanza-resistenza:new_claim:2026-05-18:riportatoMon, 18 May 2026 08:00:00 GMT