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Re: Challenge for naysayers of the Kensington Runestone

Subject: Re: Challenge for naysayers of the Kensington Runestone
Date: Fri, 12 Aug 2005 05:30:20 -0500
Newsgroups: sci.archaeology
In article <[email protected]>, 
[email protected] (Tomi) wrote:

> Is it, that somewhere the wind always blows in certain 
> direction in the morning and then in the opposite direction in the 
> evening, for example.

 I am far from an expert on sailing or metrology. However in some 
areas you can rely on predictable wind patterns for 90% or so of the 
year. The actual strength of winds may vary but direction is 
predictable. Square rigs give the most sail area with limits on 
sailing close to the wind that are greater than fore and aft rigs. The 
best rig is a mixture of fore and aft and square sails that can be 
easily varied to compensate for wind conditions. However this tends to 
need more than one mast. Fitting masts is not trivial. The footings 
have to be able to resist the loading of the rigging without pushing 
through the bottom of the hull. Finding suitable mast timbers was not 
trivial either especially before built up construction.

 I cannot think of any post 17th century european single master that 
used anything but a fore and aft rig. However these are all 
comparatively small and the required sail area is far less. There is 
no real argument that downwind, or on a quartering rind square sails 
are best, hence the development of the spinnaker for yacht racing.

 Ken Young

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