shear tip sails question

shear tip sails question

Post by Walt » Wed, 27 May 1998 04:00:00


It looks like the shear tip of the NP Z1 was designed so that it is for
the most part parellel to the air flow when the sail is raked.

I wonder how important the tip being parrellel to the wind flow is. The
NP web site gives a bunch of reasons why the tip is wonderful and the
parellel wind flow isnt mentioned. It would seem that the sail being
very upright would still have the benifits even though the end of the
'tip' at the leech would be higher than the end of the 'tip' at the
mast..

Thanks!

 
 
 

shear tip sails question

Post by Xracerx2 » Wed, 27 May 1998 04:00:00

The idea for the shear tip was thought up by a guy in the Maui Sails loft who
worked on esperimental aircraft for a number of years.  The angles for shear
tips on planes are well tested and documented.  When Pryde set out to design
the sail they tested  a variety of different angles until  they found one that
was consistently fast and comfortable.  Barry Spanier designs based on what he
see's and from the input of his riders.  He doesn't do much work with
computers, windtunnels, or number crunching, it's all trial and error.