Quote:
| Originally Posted by Taste4SaltH2O .... Also, I read somewhere a writer talking about the design of the sails not taking into account something to do with the wind (I can't remember if the word was "swirl"; in my mind it seemed to be something like turbulence), I think it was relating to the sails highest on the masts. I was wondering, if you can figure out from my attempted description what the writer was talking about, whether you have a response to that. |
That would be the 'twist' in the apparent wind that occurs as one gets higher in the rig and the wind gradient gets more robust. Ideally one might 'twist' the upper portions of the rig to more closely match the different wind directions resulting from the wind gradient bottom to top or vice-versa, but that would add a lot of additional complication to a fairly mechanized rig already.
http://boatdesign.net/forums/showpos...7&postcount=47
Note the sheeting angles for the sails on the three different mast are also different....a result of the 'slot effect' between the sails. There is a number of discussions of these effects at
"Sail Aerodynamics" http://boatdesign.net/forums/showthread.php?t=457
....the most forward sails are the most productive at providing forward drive, and aft sails assist the forward sails to point higher