Subject: [harryproa] Re: Rig questions, again |
From: Mike Crawford |
Date: 1/4/2010, 3:47 PM |
To: harryproa@yahoogroups.com.au |
Reply-to: harryproa@yahoogroups.com.au |
Rudolph,
I had some questions about this rig back in 2008 that no one really
addressed, probably because there was a heated discussion on the
dynarig at the time.
But now that we're talking about the swing wing:
- What costs less? An easyrig with an 800 cm deep wing mast with sail
track, a
normal mainsail, an easyrig with a wharram soft wing sail, or a
boomless swing wing? The swing wing saves on the cost of the boom, but
adds many parts and frames.
- What's safer to have up as bare poles in a big blow or on a
mooring? The wing mast might create noticeably less drag than the round
mast of a soft wing or swing wing, if feathered into the wind, but I
have heard about boats with bare wing masts starting to sail while
moored in crowded harbors.
- Given the need for several mainsheets for proper sail shape, what's
more efficient? A deep wingmast with a semi-self-regulatin
- Which would be easier to shunt? Do you think one could rig up a
series of blocks to allow the several mainsheets to feed into one?
- What's most reliable? Fewer parts are better, such as with the
soft wing, but less drag creates less structural wear-and-tear, such as
with the swing wing.
What do you think?
I want the true airfoil of a double-skinned sail,
but I'm timid enough to want to see someone else implement it on a proa
first.
---
Other swing-wing links:
http://www.dunnandd
(see top-view drawings 1/4 of the way down the page)
http://www.woodenbo
(see a bottom-view photo 1/3 of the way down the page)
(posted by Kim in 2005!)
http://www.themulti
(see the side-view photo on the far right)
- Mike
Rudolf vd Brug wrote: