Subject: Re: [harryproa] Re:: Downwind sails, its a What the ...
From: "=?UTF-8?B?QmrDtnJu?= bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 10/28/2015, 2:14 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Ah, now I understand what you meant by wing on wing. We call that "Ljungström rig" after a Swedish Yacht designer/inventor.
https://en.wikipedia.org/wiki/Ljungstrom_rig

It can only be used for dead downwind sailing. As has been pointed out, the M32 can, and the Harrys should be able to, sail faster than the wind, by always sailing with the wind coming a bit sideways.

Talador: The M32 has a rotating wing mast. Efficient upwind, with strong apparent wind. When sailing downwind at an angle, the apparent wind is slower. Even though the mainsail is efficient, the boat will be faster with more sail area, even if the gennaker drags a bit more.

On Wed, Oct 28, 2015 at 2:14 AM, James Janus jamesmjanus@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

 The m32s are more often than not sailing faster than the wind a whole different ballgame than wing on wing think ice boat.

On Tue, Oct 27, 2015 at 4:00 PM, robriley@rocketmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

>> About the mast, I was thinking that since the gennaker is pulling in the top, it would maybe cause more stresses than if the forces would be evenly distributed.<<

I have no idea what Im talking about, so given that proviso let me rush right in and look like a fool :)

there were spinnakers that gave lift as well as forward force, but you still need a block on the mast top
but it does take some of the strain off the mast

cat ketches run wing on wing, given that technique
boom code zero's out wing on wing from each mast

or perhaps a new sail is required, with a fibreglass spar in a pocket as a batten to increase the head of the sails height

the reality is, a cruiser rig on unstayed masts isnt going to be wholly suitable as its an anathema to racings cause. Perhaps the best compromise is the square topped cat schooner rig that is so oversize it is most commonly reefed


Now let me help you out and you can begin with "What the...?  "



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