Thanks, I had not seen that. I have been leery of booms even before one hit my wife in the head, scaring everyone rather badly. One of the things I like about the harryproa is that it keeps the boom away from the crew.
This picture is just a regular gaff rig main, though. I mean the easyrig, with both the main and jib on the same boom. Can't you put a mirror at the top of the mast to move away from triangular sails.
- Gardner
On Sat, Mar 21, 2009 at 11:19 AM, Kim Whitmyre <kwhitmyre@dslextreme.com > wrote:
Gardner Pomper wrote:Gardner, have you not seen the wingsail used on most of the Wharram
> This is probably a dumb question, but what is the problem with a
> "gaff" easyrig? By this I mean an easy rig with a boom at both the top
> and bottom of the mast, so that both the jib and main are rectangular
> in shape, instead of triangular? Everything I read indicates that a
> triangular sail is inefficient, and that more sail area higher up is
> better. I have seen solid wing sails in this configuration.
>
> I know weight aloft is a bad thing on a monohull, because it
> intensives the pendulum effect m the inevitable heeling, but on a
> multihull, which should never lift a hull (cruising, not racing proa)
> it doesn't seem like it will matter until you are in alot of trouble
> anyway. Plus, having a rectangular sail should lower the center of
> effort considerably, to keep you out of trouble.
designs? It is exactly as you describe, with the exception of the lower
boom: it has none, but instead runs on a traveler between the hulls.
Here is a picture of my boat in the slip with the main up:
wingsail <http://farm2.static.flickr. >com/1023/ 1207431702_ 4244ed6a4e_ o.jpg
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