On The banks of the Vaal Dam in South Africa Jef ... From: Victor Winterthun <victor.winterthun@...> To: <junkrig@yahoogroups.com> Sent: Monday, November...
Hi Jef Regarding boats for sale in South Africa, You may ask designer Dudley Dix. at http://www.dixdesign.com Are you sure the Rebel is 19'? I can only find a...
Dudley no longer lives in South Africa and he probably can only tell you about his designs.He is not realy a junk rig fan, unless he has changed his mind since...
Hi all, Going thru Marchaj's 'Aero-hydrodynamics of sailing', I found a graph on page 445 that perfectly explains the proportions of the Reddish sail. It shows...
Hi Bernard. Thank you for interesting info. It would be very interesting to know how much camber that is needed to make the sail go well upwind too. Say...
Hi Victor, The funny thing is, a sail of these proportions (AR=1.5) does not need any camber at all to produce the necessary lift. You can use some camber to...
Hi Bernard. So what you say is that this kind of sail is ideal for boats working with the monsoons. Victor ... From: B.J.Slotboom To: junkrig@yahoogroups.com ...
... Bernard: How does Marchaj define AR? Height/Width of a box bounding the sailplan? If so, then Tom Colvin's sailplan has an AR of 1.5 and he has always ...
Hi Victor, That is right. It is ideal for reaching and running. Of course it can go upwind as well, but not as good as higher rigs. You could make it higher by...
Hi Don, Aspect ratio is defined as : height^2/sail area. According to that definition Tom Colvin's sail plan has an AR of 2, so Clmax will be about 0.9 . ...
... Jim: The aspect ratio (AR) of a sail is a (dimensionless) measure of its proportions. A high aspect ratio denote a sail that is tall and skinny - like...
Marchaj's definition of AR is height squared (height^2) divided by the ... If ... then ... Thanks for the explanation, Don. It seems like a little more of the ...
Dear Bernard, For an offshore cruiser then, could it be practical to get the best of both worlds from one sail by designing this rig with a higher aspect ratio...
Hi Steven, Giving the rig a higher aspect ratio would make it more suitable for beating, but you need camber to keep the lift at the same level. Reefing it, to...
OK,so camber works best in a high aspect sail and a flat sail works better in a low aspect rig. Is it known if gurney flaps/spoon leech's work better in a high...
Camber is always a good thing. In a low AR rig it is not absolutely necessay to get the lift you want, but you can get the same lift for a little less drag. In...
Bernard has pointed out the performance benefit that can be achieved by using a low aspect ratio sail plan. Other significant advantages include reducing...
Hi, Don I think that you are right, that is that double sheets would be less trouble with a euphroe system. I like the Hasler sheeting system because I want...
... Tim: I wonder who you could be talking about ;-) However, I may have had an 'ah-ha!' moment about my hard to reach euphroes. Or, maybe not, we will have...
Hi, Don At least there are bunches and bunches of Gazelles and other TC designs out there, especially on the Atlantic coast. I've even seen a few out here on...
Hi Don, Yes, it can. Marchaj's Finn-sail (AR = 3.1 with 10% camber) has a Clmax = 1.3 . A flat Reddish sail with AR = 1.5 will have a Clmax = 1.3 , and with...
Hi. I remember I read in the JRA Newsletter that somebody had rigged his double sheeted sail with a rope going in a sling forward of the mast, and around the...
... A few more comments on the above statement. Although Marchaj does not specifically say so, it is reasonable to assume that the AR-deltaCL graph on page 445...
to the fellow who was looking for junk rigged boats... try http://www.ucolick.org/~de/boat/boatsearch.html a scrape of all yachtworld listings that looked...
