Surfing Yawl

My idea, my dream sailboat, carefully thought out and calculated, is a Surfboard capable of staying still and standing safely like a 19th century fishing boat.

 

I can smell the tar from here......

I believe it was the deep fore foot that made running down big seas questionable. People who owned "Guiding Star" made a point about the boat going "where it wanted" when running in strong Trades.



Its a small rudder compared to the wetted surface, might not help also.

 

Uovo di Colombo

Egg of Columbus - Wikipedia https://en.m.wikipedia.org/wiki/Egg_of_Columbus

Take the two rudder blades of the Windsurf board out of the water... and anchor in the sea facing the waves. And as an intermediate step to comfortably drop the sea anchor, the sailboat should behave as if it were a Yawl.

 

Sunfast 20. Pretty slick on the bottom with foils raised. No idea of the build quality.......

 

Good link.....

 

"it was the deep fore foot that made running down big seas questionable"

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E x a c t l y

That's why Thomas Harrison Butler is imho the high summit of the Classics

 

1 Ton WindSurf Board for an old fogey, Thomas Harrison Butler in Memoriam

 

+ Very Powerful Upwind
+ Excellent passive safety
+ Magnificent SurfBoard
+ Able to anchor in the sea

 

Hillyards also, where respected by their owners, despite having the same "slow pig" descriptor as Tahiti ketches.



Given the number of Colin Archers that have pitch poled, the finer aft lines of the Tahiti and Hillyard give less for overtaking waves to push on, or lift.

 

The bad character of many modern yachts is due to

1) the mismatch between LCB and LCF and specifically LCF aft of LCB instead of in the same position or forward:

LCF aft of LCB on the one hand causes a bow-down pitch when heeling, and on the other hand makes it easier for the wave coming from the stern to cause a faster and deeper pitch

2) the bow capable of creating a lot of lateral force with a center of pressure very far forward

3) the hydrodynamic center of the keel forward of the yacht Center of Gravity, and

4) all its imbalances feed back and reinforce each other in a lot of loops



The magnificent performance of a well-made Classic is due to the sum of

1) Longitudinal Balance: LCB does not move aft when the yacht heels

2) Bow tolerant with Pitch because it does not create a vertical leading edge, and because the side is inclined and because it is joined in one piece/wing with the keel

3) Keel that forms a Delta Wing, the Center of Pressure moves aft as Yaw/Leeway increases, so for example with only StaySail it sails balanced, and if the Main is hoisted it also sails balanced because Leeway increases and then the lateral pressure of the water moves aft

And if the yacht yaws surfing down a big wave the same: the lateral hydrodynamic pressure of the water moves aft

So it is docile and very well behaved and tends to sail alone and does not require much rudder force/action

4) and finally: the vertical component of the hydrodynamic pressures:

High pressure at bow and Low pressure, Suction, in stern that, Bow Up, Stern down, transform the yacht into a prodigious Surfboard

 

Given that the "math" is not a secret, cold it be that the accommodation envelope required by today's buyers, are somewhat responsible for unbalanced craft?

Racing craft excluded when performance leaves some "seakeeping" adrift....

 

You may be describing yourself. Insulting and belittling people that actually know how to sail is much easier from the comfort of your living room than going out on a boat and finding out what the real world is like.

That is absolute nonsense and only shows that your ignorance about boats is only equaled by your arrogance. Further, your obsession with surfing is rather silly.

 

Arguably, of course, it's very good sense to sacrifice some aspect of performance in order to increase accomodation. After all, what proportion of the time of a typical yacht is spent running downwind in big seas, compared to sitting stationary?

Any idea that modern boats per se are uncontrollable downwind in big seas goes against a vast amount of evidence. If some people can't sail them properly then it's not the boat's fault, but the sailor's fault.

The claim "modern boats are uncontrollable downwind" has been made in print for over 100 years. Giant schooners like the Germanias were known to have been completely uncontrollable at times even inshore. Dorade was said to be "a rolling fool". The schooner Nina pitched so badly that her second owner sold her after his first voyage on her. Famous US sailor/builder/designer Robert Derektor said that the heavy US CCA rule boats of the '60s were "no damn good" downwind. Francis Herreshoff criticised the designs of people like Stephens and Rhodes for alleged poor seakeeping qualities.

Most criticism aimed at modern boats that relies on the 1979 Fastnet race is illogical. That is because (1) the boats in the Fastnet had very little in common with the wide stern modern boats being criticised; (2) most boats in the Fastnet that suffered loss of life were recovered unharmed after the storm and after their crew had suffered fatalities when they prematurely hopped into liferafts that sank - the boats did very well; (3) the loss of life on cruising boats and multis in the same storm was proportionately far higher.

Similarly, in the 1998 Sydney-Hobart the greatest death and sinking ratio was on the "classic" boats, like Winston Churchill which was a sister to a fishing smack.

 

Some friends of mine raced that famous Fastnet. It was no more than a strong gale. They had no problem at all. The problem was a combination of daysailers that were not designed for anything but nice weather and bad seamanship.

 

Beneteau Oceanis' and Macgregor powersailers are also often respected by their owners.

A lot of respect for a boat can surely come when people just ignore their downsides. For example I'm often horrified when Wooden Boat or Classic Boat magazines refer to sailing tests where medium-size boats tacked reliably and easily. To me it seems bizarre that the prospect of NOT carrying out a tack even comes into consideration. This Hillyard owner has had times when the boat just could not tack; . He is not the only Hillyard owner who reports similar issues. So without dissing Hillyards, surely they show that the opinion of owners has nothing to do with objective assessment of overall handling and safety.