Force 7 Ocean Wave

Wind Force (Sail): 1350 Newtons
Lever arm (h): 4 m

 

Now all that remains is to carefully calculate the hydrodynamics of the magic carpet's stable equilibrium on the Yaw axis.

The magic carpet begins to glide with Force 4 waves, and more wind and waves there are, the more fun the magic carpet becomes.

hydroDynamic CLR =

+ Max Michael Munk Moment
+ Keel Lateral Force x lever arm
+ Rudder (without moving it, without touching it, without looking at it) Lateral Force x lever arm

 

Beating Upwind
25 knots @ 10 m

230 kg sea water
1 electric pump

 

The waves are too high to move forward, or we want to avoid possible damage, as has often happened when beating upwind. We want the sailboat and its crew to rest.

We stop the sailboat with the rudder blades out of the water.

Heaving to with reefed MainSail

The storm is worse than we expected.

Plan B

We lower the mainsail and deploy the sea anchor with 100 meters of rope. We hug the sea, bow to the waves, with the rudder blades out of the water.

 

Force 7 Ocean Wave

Well, here is my proposal

 

Mast Closed

the halyards on the outside, it is a barbaric superstition to make holes in the mast which is one of the three sacred things along with the keel and the rudder

10 mm Plywood Epoxy Fiber

Bottom: 800 g/sqm
Topside: 500 g/sqm
Deck: 200 g/sqm

Hull: 400 kg
Keel: 265 kg
Things: 200 kg
1 Crew and clothes: 100 kg
Fresh water and Food: 150 kg

150 D/L full Loaded

 

And

AutoPilot, WindPilot ... ?

Nein, nein, nein

Verboten

(Pure harmony with the wind and waves)

Upwind, the sailboat is 'steered' by a slingshot rubber band/tube and forces equilibrium

Downwind, with gennaker, the sailboat sails with a helmsman/woman, and in all other cases Downwind, the rudder is entrusted to the StaySail Boom and a slingshot rubber band

 

In the last DownWind case ...

the boat sails with the rudders fixed and the StaySail reduced with its single reef and centered

 

Obviously, it's during the incoming and outgoings that one curses sailing in a fuxxx One-ton Windsurf board and not a 30-ton Yacht.

You have to be very careful in these cases with the time, the wind, and the tide.

 

1 Ton Plywood Epoxy
WindSurf Board

Chine at stem: + 2 cm
Chine at transom: + 30 cm
Center of Gravity Vertical Position: +/- 0.0

1) hydroDynamic Lift
2) Force of the Earth
3) hydroStatic Force
4) hydroDynamic Suction

Still photo at takeoff
Froude number 0.60

Takeoff speed: 8.8 knots

Top speed of the magic carpet carried in the arms of the great Ocean Swell and propelled by the Wind Force and ... the Almighty Force of the Earth: Wave speed: 12-14-16-18-20 knots



Drag at 20 knots: 3000 Newtons
Force of the Earth: 2000 Newtons
Force of the Wind: 1000 Newtons

True Wind: 30 knots

 

It's all very New Agey.

 

old "Baroudeur"
19.19 ft LWL, 2.2 tons
crew: 1 retired merchant mariner

From Barbate to Canary islands

Force 6

5.5 knots, peak Surf 10 knots

5.5 knots, peak Surf 12 knots

Force 7

6 knots, peak Surf 16 knots

6 knots, peak Surf 12 knots

7 knots, peak Surf 20 knots



brand new 45 ft Yacht
crew: 1 owner (naval architect) + seasick wife + seasick friends = 1

From Madeira to Canary islands

Force 7

Roll
Pitch
Yaaaw

Roll
Pitch
Yaaaw

16 hours (!) 16
chained to the wheel

(2 powerful AutoPilot)

16 hours chained to the wheel...
for the second time/summer (!)

OMFG

That's why the owner had installed a second, more powerful autopilot ... obtaining the same result: condemned to be chained to the wheel

---

1 Ton WindSurf Board
For an old fogey

Some Amish seem to accept electricity ...

so ... once a high bar is set (tying with an old boat and the sailboat almost sails alone without a helmsman) ... the bar could be relaxed and an Autopilot accepted

Pcnautic Tiller Autopilot https://pcnautic.com/en/product/pcnautic-autopilot-tiller-pilot

It is an unimportant detail

the important issue is the good dynamic behavior

 

Sitting comfortably in a deep and safe cockpit that gives a good feeling of protection, the sailor is attached to the boat, which is his exoskeleton, with his harness and smiles.

1 man
1 boat

130 D/L coastal Cruiser
150 D/L Ocean cruiser

Frank Cowper: the sailor who "invented" cruising - Practical Boat Owner https://www.pbo.co.uk/specials/frank-cowper-the-sailor-who-invented-cruising-76055

 

Yes, autopilot

Upwind allows the boat to sail faster at 6 knots (boxes A1 and B1)

Windex = 35° (A10, B10) is logical and natural when the wind picks up

(with the rudder fixed or with a slingshot rubber band/tube, it's necessary to sail closer to the wind)

And Downwind is also more effective.

 

Passive safety can be greatly improved.

Upwind comfort can be significantly improved.

The appendages can be made retractable, allowing for many options, from anchoring in a shallow area to resting the boat on a sandy beach, and leaving the sailboat standing bow-first into the waves with a reefed mainsail or a sea anchor.

Small boats have huge potential.

It doesn't take a committee of NASA scientists to turn this little beast into a safer and much more comfortable boat.

---

- old "Baroudeur"
- 1 Ton WindSurf Board for an old fogey
- MiniTransat Pogo 2

The difference in speed is obviously the average speed.

The peak/top speed (which can last 30-60 seconds) is the same because the boat is in the arms of the big wave.

---

The speed reached is a funny and amusing matter but it is irrelevant to the big question: the boat is going to be propelled by gigantic forces and if it cannot accelerate in a controlled manner then it is very uncomfortable or unmanageable or even flips like a church bell.