https://matteocampagna.com/en/registry/equipment/launch-speed-vertical-spread 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/launch-speed-vertical-spreadThe mechanics are clear and the measurements agree, but nearly all of those measurements come from machines. At seventy metres, with a compound launching at 74.5 metres per second, one metre per second more launch speed raises the point of impact by about thirteen centimetres, almost twice what a one-metre error in distance or twenty per cent more aerodynamic drag would do. With a slower arrow, at sixty metres per second, a model for the traditional bow gives more than twenty centimetres per metre per second. High-speed footage shows that the vertical offset at the target matches the vertical component of launch speed multiplied by the time of flight: the agreement is good when a robot is shooting, weaker with the one archer filmed, where the variability of horizontal speed also weighs in. In fifty-nine arrows of the same model shot by machine, mass and mean spine account for 46.7 per cent of the vertical spread and less than a fifth of the horizontal one, and the same study cuts the size of the effect down: the ballistic calculation predicted over fourteen centimetres of vertical range, while the measurement gave 8.8. In archers the speed varies very little, one or two kilometres per hour from one arrow to the next, and across seven archers from the German national squads neither mean speed nor its consistency entered the model of the score. The direction is solid, the size needs revising and the link has never been measured in a group of archers: that is why the status is "Reported".claim:velocita-uscita-dispersione-verticale:revision:2026-10-16:3Fri, 16 Oct 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/launch-speed-vertical-spread#storiaA model built for the traditional bow without a sight reaches the same direction from a lower speed: at sixty metres per second, a difference of three metres per second shifts the impact at seventy metres by 69 to 80 cm, more than twenty centimetres per metre per second against the thirteen calculated for a faster compound. The slower the arrow, the more the same difference weighs. It is a model in a regional journal, with no measurements: the status stays reported.claim:velocita-uscita-dispersione-verticale:history_entry:2026-10-13:2023Tue, 13 Oct 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/launch-speed-vertical-spread#storiaA shooting robot adds the mechanism from the other end: without a clicker the draw length changes from shot to shot and the arrows move up and down. The authors give no figures. In the same year a ballistic calculation puts numbers on the link between weight, speed and height: at constant bow energy half a grain more lowers the impact at seventy metres by just under a centimetre, and the weight differences measured on shafts of the same spine shift it by anything from about three and a half centimetres to more than twenty. It is a model, and together with an observation that has no figures it does not move the status.claim:velocita-uscita-dispersione-verticale:history_entry:2026-10-13:2019Tue, 13 Oct 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/launch-speed-vertical-spread#storiaThe earliest calculation of an arrow's trajectory in the bibliography already takes launch speed into account: for a 300-grain arrow launched at 180 feet per second, 5 feet per second more or less, a difference the author thinks can occur from one shot to the next, shifts the maximum range by 26 feet, or 4 per cent. It is a model, and it is about range in flight shooting, not about the height of impact on a target: there are no data yet on vertical spread.claim:velocita-uscita-dispersione-verticale:history_entry:2026-10-13:1933Tue, 13 Oct 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/launch-speed-vertical-spreadclaim:velocita-uscita-dispersione-verticale:new_claim:2026-10-09:riportatoFri, 09 Oct 2026 08:00:00 GMT