It's been proved that you can sail downwind faster than the wind. But only on land so far.

Hello! do you still make videos? Looks like the last upload was two years ago.

One question. This doesn't explain how the drive force in sails equates to a forward motion. The drive force is mostly oriented sideways, not along the longitudinal axis of the boat. So while there IS a forward component, it is usually not the major component. How does the shape of the boat, and the implementation of a keel factor in to make your boat go forward, instead of sideways? In aviation, a similar phenomenon takes place, the reaction force isn't oriented perfectly perpendicular to the wing, it is also oriented back. This is induced drag, drag created because of the production of lift. What is that sailing equivalent?

starts at 2:00

OK. That's alrite. Thankyou

Thank you!

Gracias

There will be a 7 episode?

Gracias desde Mexico sus videos son muy claros

Hope you,re going to the Port Townsend wooden boat festival. If I run into you, I'll buy you a beer!😊

Super clear, thankyou. A question I am sruggling to answer: Im pondering what is minimum drag coefficient from the keep and hull in water to make a sail work? A sail boat that floated in air wouldn't work too well. I presume you need two mediums 1 for the sail another for the body to gain traction and create momentum.

While your words are correct, your diagram and equations are not. At 6:47 your diagram is not correct. The induced wind vector is pointed at the nose, say south (say boat is traveling north). So the equation is still Induced + True = Appearant. Sure, induce subtracts from your true like you say when going downwind, but that's evident by the math. Just let the math do the work. Why arbitrarily reverse the induced wind's vector's direction, then change the sign to a negative (i.e. subtracting), introducing a second equation to remember, to make the math work? Just let Induced + True = Appearant for ALL times. It seems your making is overly complicated. Am I wrong?

Sailwind the video game brought me here

Granted, you are trying to simplify here, but the incidence angle is the angle of the wing to the aircraft. The angle of attack is the angle to the apparent wind. So, for example, an aircraft with an incidence of two degrees must be pitched up 8 degrees to achieve an angle of attack of 10 degrees. Lift is perpendicular to the angle of attack, by definition.

I have collected at least 2 pillars of the integrated sailing mechanics 1. Proper Sail Plan Material-wise quality and a trimmed sail draft as yet sail draft with corresponding wind speed and a proper Sail angle technique but the number 2 pillars are the number 1 pillar were co-dependent to be harnessed 2. Hull size geometry and a hydrodynamic related streamline close angle geometry, link from these number 2 pillars, the sail sizes to corresponded with hull geometry and hull sizes👍

Very good information

The extreme fast foiling boats make all this stuff truly mind boggling. They sail upwind even when they're sailing downwind. And do so at around 4 times as fast as the true wind!

I’m confused… At 6:00 you said you can’t sail downwind, because there will be no wind to fill your sails..? I thought the whole purpose of sailing was to have the wind push the sails, right?

Awesome video, thanks! However; a curved airfoil DO create a low pressure (suction/lift) on the curved side as well. Just hold the curved side of a spoon under running water from a faucet, and you’ll see. Better yet, next time hold that piece of paper stretched out in front of your mouth and blow on top of it. Same result.

Mercator wasn't Italian.

Terima kasih informasinya dan arahan yg sangat bermanfaat untuk belajar.

I think that Bernoulli effect plays a significant role especially when the sail is well trimmed. And the carbon based foils are specially designed to harness the Bernoulli effect in particular.

Well done lecture. 👍🏼👍🏼

This was a really great explanation, and really helped me understand better

"buy me a beer" to the next level 😂

you have no idea how much this helped me

As someone who recently started sailing in my sixties, my knowledge is coming from utube and books, you deserve a trophy for how pertinent, clear and relevant your explanations are. Thank you very much for sharing!

hi owen, thank you for making these super helpful video.

A very detailed video. Great work!

Excellent explanation. Thank you.

Sailing downwind on broad reach or run, what are recommendations for draft.? Fuller / baggier sails or flatter.? Thanks

Really helpful video, thank you! It's interesting that there's the same debate in sailing physics as there is with airplanes - whether it's Newton's third law or Bernoulli's principle that best explains "lift"! Not surprising since they're both airfoils, but I'm just getting into sailing having been a private pilot, so it's news to me. Thanks again!

Think I'll go with the NASA engineer. You gave a good explanation of a boat which moves sideways. And a sail is not flat when full of air it looks remarkably like a wing shape when full of air.

Owen, thank you. I too was skeptical about the Bernoulli principle on a sail (or on a flat hand held at an angle out the window); intuitively and physically it didn't feel right. I'm going with your explanation re vector forces. thanks!

Thanks that was very helpful was dealing with this yesterday should have let the main out more makes sense now. 👌🏼👌🏼👌🏼 very helpful

Great Content and video explanations says this wannabe navigator. thanks from Truro Heights Nova Scotia

Well done Owen, many thanks!

THANK YOU.

I’m wondering if it’s an error or if I’m confused? Why at about 6:47 when converting the times to Daylight savings time, an hour is added to the first time but subtracted from the second?

I can't find Physics of Sailing Video 7 😢

I always wondered did my burgee/wind vein indicate the true or apparent wind? Now I know thank you, It's quite apparent.

Fascinating videos thank you. This leads me to ponder the role of the keel ?If the wind vector pushes the boat sideways how does the boat move forwards?

Great video. thorough and comprehensive. thank you.

yes i did enjoy this video sir..thank you .

Thank you. At last a tutor that explains it well and effectively to a total beginner. 🎉❤

Great work. Keep it up!

Great explanation! Thank you.

Fantastic and great explanations.

Best explanations I have heard so far. Awesome.