Full-scale flying shape measurement of offwind sails with photogrammetry

“At full-scale, measuring the spinnaker shape in real sailing conditions (flying shape) is also valuable for sail designers as they would benefit a feedback for their designs. Nonetheless it remains complex to measure spinnaker flying shapes partly because of their inherent instability, like flapping of the luff. This work presents a full-scale experimental investigation of spinnaker flying shapes with simultaneous measurement of the aerodynamic loads on the three sail corners, as well as navigation and wind data. The developed experimental set-up and photogrammetric method to acquire the flying shape of the spinnaker are presented”