I have lost track on what words have been entered or not here. Is there a draft somewhere, where we can get an overview?
I notice that the CLR and CE have been mentioned. One must remember that these are only geometrical centres.
The acronym for the actual Centre of Pressure of a wing, sail or keel, is CP. More often than not, the CP sits well forward of the CE in a sail, somewhere roughly around 30% aft of the luff.
Unlike the geometrical centres, CE and CLR, the CP will move around quite a bit. For instance the CP moves forward in a sail at low angle of attack/incidence (α) and moves aft as the α increases.
I also mean to remember that Round has be up, but I didn’t see the opposite word, Hollow.
Hollow is a concave curve; in junk sails Hollow is sometimes cut into the leech of the upper (fanned ) panels to prevent fluttering and a hooked leech.
(.. maybe there is less need for cutting hollow in the leech of a batten panel with camber in it. When I made a new sail for Frøken Sørensen, this summer, I forgot to cut any hollow in panel 1 and 2, but the leech still stays nice and taut. Maybe hollow is only needed in flat sails…)
Cheers, Arne