https://matteocampagna.com/en/registry/equipment/compound-hysteresis-draw-let-down 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-hysteresis-draw-let-downThe measurements exist and point the same way, but there are two of them and they come from the same author. In 2015, drawing a 55-pound round-wheel compound slowly with a winch to the bottom of the valley and then easing it back to the starting position, the force read on the draw comes out systematically higher than on the way back; in 2016 the same happens on a commercial twin-cam compound. In both cases the author puts the gap down to friction in the wheels and to hysteresis in the limbs, string and cables, but does not quantify it: the difference can be seen in the graphs, there is no figure and the two causes are not separated. The measurements were there to calibrate a model, and in 2015 the calibration used the drawing and the let-down data together; each time there was a single bow. On the two bows measured the gap is there; how much it is worth in pounds, and whether it changes with cams, strings or the number of cycles, is still to be measured.claim:compound-isteresi-forza:revision:2026-08-08:2Sat, 08 Aug 2026 08:00:00 GMT https://matteocampagna.com/en/registry/equipment/compound-hysteresis-draw-let-downclaim:compound-isteresi-forza:new_claim:2026-07-27:riportatoMon, 27 Jul 2026 08:00:00 GMT