Advanced learning material on hull shape design?

Ultimately, is a matter of brute force; the hull is unimportant, much less the so-called "residual Resistence", which has apt name.

The important thing is a clean hull and reading the wind changes, and if one knows how to anticipate the wind changes then one is at a much higher level than the average mortal.

Perhaps the induced drag of the rudder could be reduced by having two deep rudders, one of them (the windward one) out of the water

Downwind is a different matter.

And downwind with ocean Waves is a different matter; here, the Hull and balance are important.

 

The problem with a dinghy is seeing the magnetic compass, and these pretty inventions are somewhat expensive.

Prism https://www.velocitek.com/pages/prism

On a slightly larger sailboat, you can use a compass (or rather two, one on the port side and one on the starboard side) with a wheel to mark the course and not have to memorize the number, making it more convenient to monitor the Wind

 

1) Leading edge indicator
2) Jib/StaySail twist indicator
3) MainSail twist indicator

These three tools together—Windex1964, a magnetic compass, and Tell Tales—make a powerful team.

 

3D leading edge Trim (jib/staysail)

1) Angle of Attack
2) Camber
3) Twist

These details are what make the difference between a 15th-century ship-with-sails and a modern (1930-) AeroNautical machine.

 

Returning to "h"

Returning to "h" and the striking dinghy "Fandango" on its tremendous 100-day cruise to Norway with a brave adventurer, reincarnation of Frank Dye.

"Beowulf," on the right of the image, beat the spectacular "Mari Cha III" ... because it had more lower sails.

 

(GZ / h) x D

The available force depends on (the righting lever (GZ) divided by the vertical distance (h) between the wind force and the lateral water force) multiplied by the displacement (D)

So the powerful secret weapon isn't found somewhere hidden, but in, for example, reducing "h" with Twist on a fractional rig (3/4) and loading seawater windward at the same time increasing GZ and D

The effect, instead of being 1% after thousands of hours optimizing the hull, is +100% (!) on a small 1-ton sailboat, which for example had 400 Newtons of forward force and now has 800 Newtons.

In other words, on the one hand, geometry and brute force, and on the other, the great secret weapon is being able to read the wind.

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"Beowulf" does not carry salty seawater but moves fresh water

 

For me, the most beautiful 'secret/advanced learning material' detail is the seabirds: twist

 

I would be really interested to see someone sailing at 25 degrees upwind. However, I am even more interested on why 30 and 35 degrees are possible, but 34 is impossible.

 

Can we please get back to discussing hull shapes? Some of us really do think they can be important.

 

I agree with Carlos. If the other guy somehow has a 10% better hull than me, then his boat will probably be faster. If I am much better at reading the wind in terms of gusts. lulls, shifts,and which part of the course is advantageous, I will arrive at the weather mark ahead of the better boat.

For regatta sailors who are willing to learn more about the vagaries of the wind and what to expect in the next minute, here is a worthwhile book that can be most helpful. .... The Wind and Sailing Boats by Allan Waites. another older classic is: Wind and Strategy by Stuart Walker. Part of, but not all of the deal is actually reading the clouds and paying attention to nearby shorelines and water depths. Competitive sailing is a brain strain in the same category as 3D chess. Maybe worse. 3D chess players do not have to bust their guts by hiking out like regatta sailors do.

 

Sorry for the distracting outburst Doug. Yes, let us get back to the original subject.

Incidentally, the OP is a regatta competitor who is pretty good with all that wind stuff. He just wants his boats to go faster and is anxious and prepared to learn how to make them so.