An answer to Tom Speer's Dec 23 message seeking comparative performance of biplane versus single sailrigs - see the Biplane sailrig photos and text of Radical...
I found that with battened jibs and battened mains using very stiff battens the performance improvement was startling especially in light winds. I tried 4 jibs...
Here is a video which has a very short clip of Loisirs 3000 sailing (+/- 1 second). The consolation prize is, there's an additional 3 1/2 minutes of very fast...
The structure is effectively designed for (say) 1/10th of the loads then this is duplicated 10 times. This is not as stupid as it sounds - the structure is...
he 43rd Annual General Meeting of AYRS will be held on Sunday 21st January 2007 at the Village Hall, Thorpe, Surrey, UK, starting at or after 4.00 pm. The AGM...
When calculating the area of lateral resistance for a hull with fixed bilge keels, what percentage of area is included for the windward keel. Logically I think...
Off the top of my head (because I've left the press release at the Boat Show): Pure Concept: 1st Nutshell by Chris Challoner 2nd Entry: No 9 Concept & Design:...
I have no idea how to calculate it but one need to consider (at least) if the keels are set at an angle of attack towards the centre line and also the designed...
As I recall, bilge keels need about 50% more area, in total, than a single keel (each keel = 75% of the single keel). The tradeoff is that they naturally stand...
Hi John I suspect it depends on the angle of heel and the angle that the keels make with each other, in both planes (horizontal and vertical). Remembering that...
Hi JohnT Your question below refers to calculating the area of lateral resistance for a hull. Assuming you are trying to find the Centre of Lateral Resistance...
... Thanks Simon Thats pretty much the idea I was least uncomfortable with, at least if the windward keel does contribute something thing it is additional to...
dear Charles MAGNAN, We are going to organise a meeting of creative boats here in Port Saint Louis du Rhône France arround the Newick's atlantic proa CHEERS. ...
I thought someone had better post a reminder that in just one week time from today the Amateur Yacht Research Society is holding an 'all day' meeting. All...
Tom, Did you want to continue this dicussion? Robert ... ___________________________________________________________ Tiscali Broadband only 9.99 a month for...
Just to report that the AYRS meeting held yesterday on the South west side of London was a big success. Thanks are due to Fred Ball, AYRS chairman, who started...
Thank you for your write-up, John! ... This was Luc Armant's hapa and video. I gather he is still subscribed here. I have begun reading his (French language)...
G'day, I am looking for a student to do some number crunching on a low speed, large diameter surface piercing prop driving a lightweight boat at relatively low...
This boat was on Duckworks a while ago, photographed and described by someone who spotted it in harbour. Now there is some more official information available...
I tend to agree with you, Robert. There's probably going to be far more energy absorbing potential in the flexy, air inflated hull forms than there will be in...
ete Silcock (psilcock @ active-services.org.uk) has two sets of foils from Blue Arrow - the last British contender for the America's Cup in its classic form...
Referring to the Fred Ball article in Jan 2007 Catalyst and "What use is it to yachtperson?" How about means to control a yacht in very high winds which result...
Ian It is years since I last looked up the theory of Flettner Rotors, so I hope someone will correct me if I am wrong here. I think that if you speed up the...
