In 1995, Dave Gerr compared in his book "The Nature of Boats" the mechanical properties of various fibres one could use for composite hulls. He included...
My understanding is that Dyneema is closely related to Spectra, and Cuben Fiber is still the world leader in laminating this very slippery material for sail...
To the best of my knowledge, no one's yet cracked the adhesion issue. Spectra/dyneema (which are chemically identical) fibers are slippery. Without positive...
I concur with Dave - creep is the property that really puts it out of contention for structural components that have to sustain prolonged stress, such as boat...
If creep, not poor adhesion, is the reason spectra is not widely used in laminates, I wonder why not Vectran, which has comparable strength/weight and...
Thank you Robert for a link to a website which is well worth reading, even if you are a lazy one like me who prefers to use wind power rather than human power....
As one of the moderators of this discussion list I have noticed a considerable influx of new members over the last few days. I don't know where you have all...
... I would hazard a guess that the kayak wasn't an open ocean-designed craft while Greg's was. Much less length, wetted surface, etc. Like any armchair...
I too would have thought that a propeller would be more efficient, so that makes me wonder at his propeller design. I trust he has had it optimised with ...
It would depend on the hull design and the rower. I would imagine kayak and experienced paddler would be able to use the power of the waves to a degree - the...
... A few years ago two Frenchmen pedalled themselves across the Atlantic, but their vessel was a fairly big one, and they sat up in more or less normal...
... Hobie really ought to get someone lined up to take on the 24hr record with Mirage drive - perhaps Greg Kolodziejzyk is the man for the job and he can use...
... Indeed. One of the most famous Atlantic crossing (several have been made) took place in... 1928! But, if I have well understood, you live on the Pacific...
Hello, Bob! I would like to know if you know how to reach the owner of the "thing" with 4 Bruce foils that was towed in Portland during the Weymouth Speed...
Yes it was me Send pics! Bob ... From: roche182@... Date: 17/11/2007 13:06 To: <ayrs@yahoogroups.com> Subj: [ayrs] Message from Emmanuel Roche, France ...
In my October 6 message I sort help to analyse the strength of the bridgedeck of my plywood catamaran, but did not obtain an answer to this problem. I am aware...
Ian - there are many free FEA programs out there - http://www.ce.berkeley.edu/~rlt/feap/ for one. This is a problem that no-one else (other than a slave) can ...
... <cut> ... Not especially - Percy doesn't have as much material as he would like. we're giving up waiting and producing a thin edition. Simon -- Editor ...
I am somewhere near the start of trying to find/use/understand FEA for analysing my bridgedeck structure. Not progressing much ... or there is a lot to it. I...
If you only want to analyse that structure then ... revise "mechanics of structures" and treat it as a jointed beam problem - your beams are relatively thin...
Hi there, I am design a (25foot) sailing catamaran, and am in need of some advice regarding any health and safety legislations that are in existance for such...
... like. ... Gooday Simon I hope that Catalyst and other AYRS hard-copy publications are not phased-out because of the AYRS Internet chat group. For me, this...
Ian, since my "back of the envelope" calculation I had a look for free Finite Element Analysis code and, through a lead on freebyte.com (one of my favourite...
Hello, Simon! ... During my stay in England, the number one subject was International Moths on foils... Here is a 3-years old article dealing precisely on this...
Reply to the following excerpt of the Tom Speer Oct 6 message "You need to assume a given amount of deflection, say one degree, and then add up the torsional...
hello, can you tell me where the ayrs stall is this year and at what boat show. i had a look at earls court this year and cannot see ayrs name down on the list...
... how unfortnate, i have just checked back to this message and i am a month and a day late. perhaps i could catch up with the ayrs at a boat show this...
WE're at the London International Boat Show at Excel in January we're not at the Earls Court Boat Show this week. We thought about going to Earls Court as well...
