https://matteocampagna.com/en/registry/equipment/compound-bow-rotation-power-stroke 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/compound-bow-rotation-power-strokeThere is a single piece of work, from 2010, and it is a dynamic model of the compound bow. According to the calculation, during the power stroke the bow rotates in the vertical plane and the direction depends on the cams; the authors state in one sentence that they checked this with accelerometers mounted on the riser, but the measured data are not published and the paper does not say whether an archer or a machine was shooting, so the registry reads it as a model. On a single-cam compound the top limb moves away from the archer, because the cam at the bottom and the wheel at the top have different inertias; on a hybrid-cam bow the rotation is the other way round, and the main cause is the reaction from the string pushing on the arrow, which sits above the grip. The same model shows that no position of the bow's centre of mass can bring the rotation to zero, because some of the moments involved are constant while others follow the force on the arrow and the speed of the cams, with different profiles over time. Two things limit the picture: the resulting movement of the nocking point is small compared with the one produced by the geometry of the cams, and the part about it being impossible to cancel is an argument from the model, not a test carried out by moving weights on the bow. That is why the status is "Transferred". On the recurve there is only, from 2009, the aim of a single archer recorded with a laser on the grip: it shifts during the release, but the measurement does not separate the movement of the bow from that of the hand.claim:rotazione-arco-spinta:revision:2026-04-04:3Sat, 04 Apr 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/compound-bow-rotation-power-strokeclaim:rotazione-arco-spinta:new_claim:2026-03-11:trasferitoWed, 11 Mar 2026 08:00:00 GMT