It's been proved that you can sail downwind faster than the wind. But only on land so far.
@thewaterheaterfactory5 күн бұрын
Hello! do you still make videos? Looks like the last upload was two years ago.
@cadenorris400927 күн бұрын
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?
@markph020429 күн бұрын
starts at 2:00
@jackgalloway8314Ай бұрын
OK. That's alrite. Thankyou
@user-nd1cy5tt5dАй бұрын
Thank you!
@marioandresheviacavieres1923Ай бұрын
Gracias
@carlosnavarro34502 ай бұрын
There will be a 7 episode?
@carlosnavarro34502 ай бұрын
Gracias desde Mexico sus videos son muy claros
@jedwilliams64103 ай бұрын
Hope you,re going to the Port Townsend wooden boat festival. If I run into you, I'll buy you a beer!😊
@TheEvade843 ай бұрын
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.
@space_speaker4 ай бұрын
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?
@scottl96605 ай бұрын
Sailwind the video game brought me here
@kenfry26645 ай бұрын
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.
@kenfry26645 ай бұрын
Sails are not "flat sheets". They are curved, and are crude airfoils. Windsurfers often use RAF (rigid air foil) sails. Hang gliders use single surface wings... which are also airfoils.
@markandoyo22046 ай бұрын
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👍
@hclausse7 ай бұрын
Very good information
@alanjm12348 ай бұрын
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!
@humlakullen8 ай бұрын
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?
@alanjm12348 ай бұрын
What he said was that you can't sail dead downwind at the same speed as the wind. This is correct, because if you travel at the same speed and direction as the wind, you will feel no wind, so there would be no pressure on your sails. Most boats can only manage about 50% or less of wind speed dead down wind. Big downwind sails like spinnakers can improve this, but you still can't match the wind speed because the hull(s) have drag in the water. (A hot air balloon can actually match wind speed dead downwind because it has no drag against the land.)
@humlakullen8 ай бұрын
@@alanjm1234 👍
@humlakullen8 ай бұрын
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.
9 ай бұрын
Mercator wasn't Italian.
@mstaufik32549 ай бұрын
Terima kasih informasinya dan arahan yg sangat bermanfaat untuk belajar.
@JG27Korny10 ай бұрын
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.
@erents110 ай бұрын
Well done lecture. 👍🏼👍🏼
@jimbob207411 ай бұрын
This was a really great explanation, and really helped me understand better
@SailingSarah11 ай бұрын
"buy me a beer" to the next level 😂
@karonte198011 ай бұрын
you have no idea how much this helped me
@tomcunningham858411 ай бұрын
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!
@petersunhome784711 ай бұрын
hi owen, thank you for making these super helpful video.
@user-ls1it7oh3q Жыл бұрын
A very detailed video. Great work!
@josephlai9759 Жыл бұрын
Excellent explanation. Thank you.
@algotrader8677 Жыл бұрын
Sailing downwind on broad reach or run, what are recommendations for draft.? Fuller / baggier sails or flatter.? Thanks
@jameshanson4880 Жыл бұрын
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!
@daviddoherty4429 Жыл бұрын
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.
@bp-cb2gd Жыл бұрын
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!
@stevendiraimo3315 Жыл бұрын
Thanks that was very helpful was dealing with this yesterday should have let the main out more makes sense now. 👌🏼👌🏼👌🏼 very helpful
@abettermousetrap Жыл бұрын
Great Content and video explanations says this wannabe navigator. thanks from Truro Heights Nova Scotia
@jwebster5840 Жыл бұрын
Well done Owen, many thanks!
@drivercdl2376 Жыл бұрын
THANK YOU.
@mymicks Жыл бұрын
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?
@keithlittlebury2986 Жыл бұрын
I can't find Physics of Sailing Video 7 😢
@keithlittlebury2986 Жыл бұрын
I always wondered did my burgee/wind vein indicate the true or apparent wind? Now I know thank you, It's quite apparent.
@keithlittlebury2986 Жыл бұрын
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?
@BasicCruisingwithOwen Жыл бұрын
The wind can be divided into 2 components, a sideways vector plus a forward vector. The keel only inhibits the sideways force component vector. There is still a forward component that pushes the boat forward. Think of a bar of soap sliding sideways at a 45 degree angle towards the side of the bathtub. When it hits the side of the tub, all sideways motion is stopped, and the bar only slides forward. The keel doesn't perfectly stop all sideways motion however, there is still some sideways drift called leeway.
@keithlittlebury2986 Жыл бұрын
Great video. thorough and comprehensive. thank you.
@assifkhan3803 Жыл бұрын
yes i did enjoy this video sir..thank you .
@jordiegundersen1465 Жыл бұрын
Thank you. At last a tutor that explains it well and effectively to a total beginner. 🎉❤