Why I'm Following Sven Yrvind

Oooof. I have not bought any International products for many years, and the epoxy i use when bought in bulk was 10 Euro a kilo. I found monourethane paint would go right over epoxy that was "scotch-brighted". Not as tough as 2-pack, but the underlying epoxy could have more coats for the same price as the expensive paint.

 

Yes, yes

Epoxy resin: 10 ... 20 ... 30 Euros kilo, 1 Coat: 50-100-150 microns

"Talking with the other technical advisors, we determined 2, 4, and 6 mils as the minimum and maximum thicknesses at which to test apply epoxy coatings to vertical surfaces"

Applying epoxy on vertical surfaces https://www.epoxyworks.com/vertical-surfaces/

Epoxy primer: 50 ... 100 Euros kilo dry 1 Coat: 37-40-47 microns

last night i thought: the money i save i will spend on West System Epoxy resin

And the savings are enough to pay for a Winche, which by the way do not stop increasing in price, i was thinking of an Andersen and apparently seeing the amazing price reached they must now make them out of platinum or enriched uranium

 

Well

All the suppliers have already been decided, i have two large boxes full of hardware (i am missing the Winche, 1 Winche, and a good clamp for the rope that raises the 300 kilo Keel)

One of the things that makes me most excited is the 3-in-1 rope in a huge 2-meter rail: boom vang, mainsheet, preventer

 

These small boats come out overbuilt

9.5 millimeters Plywood Okume is assuming 1.5 Tons (when in reality the boat will sail along the coast with an old sailor with a Displacement of 1.05 Tons and a young ocean adventurer 1.25 Tons) in a Category A ISO 12215 calculation, which is a demanding standard with the little ones and lax with the big ones, exactly like in the real world, haha

10 millimeters + 1 millimeter of fiber and resin... well, I don't know, we should know the opinion of some Iberian Orcas

 

A number of windsurfers held a number of world speed records. But they certainly don't have everything you need for a small mono-hull sailboat for high speed. The windsurfers that go for speed attempts are extremely slow when not planing (they normally don't even float under the sailor's weight) and their upwind ability tends to be poor. They also don't have the very wedgy shape of Carlos' boat, because that shape doesn't work. There's a very good reason the extreme "wedge" shape was only seen in windsurfers for about a year or two back in the early '80s, in the shape of the early Mark Paul shapes, the British Egg and others - it has major flaws, particularly because the fat stern cannot sink and often spins out. A modified wedge returned for a while with the "no-nose" of the late '80s but the angle of the forward side sections and the fat stern meant that if the lee bow caught a wave wrongly, you were crashing hard and painfully. There was no assumption, many of us experienced it. There's no real upside to the extreme wedge shape to justify the downsides.

Long (around 3.66-3.9m) non-foiling windsurfers are very quick around a normal course; faster than high performance singlehanded dinghies in anything over about 6-8 knots of breeze and not much slower than the dinghies in the light stuff, if at all. However, they are not wedge shaped like Carlos' design because the extreme wedge has no positives and has very poor handling because it planes too flat and nosedives. This isn't an assumption, it's knowledge gained by sailing the boards.

Experts in the field of small racing skiff and dinghy design have long ago dumped the extreme "wedge" planform for several reasons; firstly it tends to nosedive because of the excessive buoyancy and lift aft; secondly the planing area at the bow is very narrow and therefore does not develop enough lift; thirdly the wetted surface area is excessive; fourth there is no benefit apart from perhaps some extra form stability at low speeds. That's why you don't see extreme wedge designs from top designers and haven't done so for years. The Bethwaite designs come close but they have unusual dimensions for a skiff, and they are nothing like as wedgie as Carlos' design. Of course, the boards, skiffs and dinghies also have the advantage of being able to move a very large proportion of their weight aft. In for example a non-foiling Moth the skipper's weight of about 2.5 times the boat's weight could be moved aft to keep the bow out - and yet even that didn't stop the extreme wedges from nosediving.

If moving a 70kg sailor right aft doesn't stop a 30kg boat from nosediving it's hard to see that moving a 250kg bulb aft will stop a boat from nosediving.

The top designers KNOW this - they didn't assume it. Guys like Paul Bieker got onto wedge-style designs and found out what was wrong with them. The owners of wedge-ish designs like the old Australian 14s came up against British 14s, which had a narrower stern, and found that they were surprisingly fast. Similarly, the Mothies dropped the extreme wedge skiff Moths because they sailed then and KNEW that they has major nosediving and performance issues. Again, assumptions were not involved - this was hands on experience. It's the same in windsurfing - shapers and sailors talk to each other and try out different designs against each other, learning from each other all the time. There are literally books about the design development within a single development dinghy class.

This is why I was wondering whether Carlos has actually sailed a board, since he seem to keep on saying that his boat is like one but it's not like any I've seen since we found out why the idea doesn't work well, years ago.

 

Is his boat so far removed from a Mini Transat style Chris? They still make them like that.

I note your critique was pointed at "small racing skiffs and dinghies".

 

CT249, I really appreciate the explanation. I get frustrated when I have people tell me something is wrong and all they say is the equivalent of, "If that were a good idea, smarter minds than ours would be doing it already." Such appeals to authority are understandable, but offer no sound rational.

Your above post is far more convincing and informative.

-Will

 

The perfect summary of the world of sailing: superstitions and bar opinions

Almost 90% of what i have written in this forum has been harshly criticizing modern "wedged" sailboats from a hydrodynamic point of view. a lineage that exists in thousands and thousands: MiniTransat, Class 40 until yesterday afternoon, IMOCA, and worst of all: all their bad imitations: hundreds and hundreds of slow cruisers with wide sterns

C i don't know how many, you are the perfect summary of 100 years: a guy who doesn't know how to do a fuxxx hydrodynamic calculation pontificating haughtily at the counter of a bar

thanks for the laugh and for the empirical confirmation

you are the perfect troll

when i harshly criticize the "wedged" carenas, you defend the dominant current; When i propose a hydrostatic and hydrodynamic solution for a modern sailboat outside the world of high competition (that is, for 0.50-0.60 Froude), well now you don't like the immense totality of sailboats that are made today, and I agree with you

You are perfect for the entertainment industry

 

My creation is an amazing little sailboat

And you, who don't understand the problem, how the hell are you going to understand this solution?

A modern sailboat at the height of Thomas Harrison Butler's classic solution

A modern Z4




(Thomas Harrison Butler, Cruising Yachts):



"wedge"

haha

 

Dehler 30

... is "wedged" (?)

If i say it is a little "wedged", C will say it is not "wedged" in absolute

and if i say no, he will say yes. It is completely predictable. We have to form a comedy duo for the entertainment of the audience.

 

Pogo 30

 

And if i now say (as i have stated several times in this forum) that the Scow is a good solution, then C will say that he prefers "wedged" sailboats

what has been said: as a comic couple, a great future awaits us in the entertainment industry

 

No it doesnt. ( was this for 3 posts or an entire 3 pages?)

 

Plywood Epoxy 1 Ton 5 dot 99 meters WindSurf board for an old fogey

Thomas Harrison Butler

In Memoriam

 

Roman Sanchez on his magnificent and prodigious surfboard, an old Baroudeur, reached a top speed of 20 knots

My modern Surfboard will not run as much, because the bulk of the Force surfing is the powerful Force of the Earth, and Román Sánchez's magnificent Surfboard is 2 Tons and my board is 1 Ton

The big difference will be in the enormous upwind Power of my board: 14% of the Displacement.

A dinghy such as a 470 is around 28% according to Frank Bethwaite, High Performance Sailing