Navigați mai repede decât vântul – Cum este posibil asta?

50 thoughts on “Navigați mai repede decât vântul – Cum este posibil asta?”

1. The sponsor is Brilliant: The first 200 people to sign up at https://brilliant.org/stevemould will get 20% off an annual subscription.

   The alternative explanation goes something like this (I'm simplifying!) – Lift is generated when air is moving relative the sail. As the boat speeds up, the relative speed of the air should increase and so the lift should increase! This explanation doesn't work for when you're sailing somewhat with the wind though. In that scenario, as the boat begins to speed up, the relative speed of the wind actually goes down.

2. Vikings would laugh at Ve assertions and explanation.

3. Because its not the speed of the wind, its the THRUST generated by the airfoil shape. The sail creates an area of low pressure in front the the sail, like a wing on an airplane does, albeit horizontal. Contrary to popular myth, this low pressure area does NOT ‘suck’ the wing up, nor the sail forward. What happens is that further out above the bellied surface of the sail is a zone of higher pressure air that immediately moves into the low pressure zone created by the sail. As it accelerates into this area, the sail moves forward, and the result is a THRUST spilling off the tail edge of the sail ( or the wing) at a vector relative to the chord of the airfoil that is aft of perpendicular. Really and for true. THIS is how wings work. And everyone can SEE this at work because the low pressure side of any propellor demonstrates almost no force at all, but the other side clearly produces thrust. If the wind hits the sail at an angle that creates a particularly severe low pressure zone, then the air further away accelerates towards the wing at a speed faster than the actual wind that is blowing. Action, reaction. The boat will move in the direction the keel most easily allows at some component faster than the wind is blowing, because no matter how fast the wind is blowing, the low pressure zone accelerates it even further.

4. Look up DN iceboat racing, thats also faster than the wind like americas cup

5. Sailors called it "having the wind guage".
   A favorable wind during pursuit of escape

6. Why are modern sails triangular, while big war Galleons are depicted with square sails?

7. Don't know, anyone mentioned here the max Hull Speed? 20feet keelboat can't go faster then wind of 6 knots.

8. Bro…. You have a stain on your shirt! My OCD will not allow me to let it go without mentioning it, I apologize. Awesome content though!

9. using a propeller for a sail designed to be turned by the wind will generate more propulsion than true wind

10. change true to origin

11. A bit of history: Portuguese used this concept to improve their ship and because of that, at that time (around year 1500) we had the upper hand in sailing and because of that we could explore new places that were unknown to Europeans.

12. WOW ! ! YOU ARE AWESOME ! ! you gave credit to >" DEFLECTION"< ! ! SO many people insist that ONLY LIFT MOVES THings ! THANK you so much for giving credit to deflection …. you are the greatest of all fluid dynamics experts ! ! !

13. It's always amusing to see videos on "lift" ignoring Bernoulli Principle. That's lift folks. It's ACCELERATION over the surface. It's due to pressure, not reactive bouncing particles. Ignoring the acceleration will leave you wanting in any attempt to explain lift.

14. the term ‘sailing too close to the wind’ comes from having too great an angle on the sails

15. i like to use the visual of a light ray hitting the "sail" and reflecting off of it, and that gives the ray's new direction which is the force vector shifted 180 degrees.

16. Being a sailor, I can honestly say that very often where I do want to go, is where the wind is coming from……..

17. Keeling may be important.

18. When does the wind the apparent wind comes from directly in front of the boat?? At twice wind speed??

19. Venturi is the source of sailing theory.

20. When the wind is 30 knots what is the absolute fastest speed the boat can sail. ??

21. Thank-you. I have watched and read many articles and books even about how a sailboat can exceed the wind.
    This is the first that used the "Missing the wind" concept. Its really just leverage. The sail has to move further than the wind in the same time.
    Easy.

22. Wind sucks, it doesn't blow.

23. Wish you guys would be clear about the fact that you can't sail faster than the wind in the same direction as the wind, unless you do a quick turn. And any reference to that Blackbird/Veritasium video should only be to solve the trick.

24. Wow. Great explanation. Thank you!

25. That cord puzzle is a simple one…

26. A sailboat sail is an air foil, the vacuum (lower pressure) generated on back of the sail (leeward side) is why modern sailboats can go faster than the wind.

27. I don't know how many times I've explained this now but in Veritasium's video it can go faster than the wind as once the craft is up to speed, and the propeller is producing thrust, (remember the propeller is not a windmill on that craft) the thrust from the propeller is increased because of the tail wind. It aerodynamically increases the propellers thrust close to its' maximum which is "static thrust". An easy way to think about this is a light aircraft produces maximum thrust when it is not moving. As it accelerates down the runway the thrust drops off significantly. As it accelerates down the runway if you were to introduce a tail wind to the propeller its thrust would increase. (However detrimental to lift over the wings)

28. Really badly explained👎

29. The secret to wind surfing

30. This is like saying, can a car move faster than it's engine? Answer – yes!

31. The easy way of explaining it to a lay person is to compare to a surfer, Everyone knows a surfer can go faster than a wave and its the same basic physics escaping from a high pressure area to a low pressure area. Yachts do that both under and over the water with their keel and sails and surfers do that too’

32. lol the new graph showing how people interact with the video clearly shows that noone cares about creepy in-stream promotions

33. Very Good Explanation and Thriller Video when Boat sails at more sperd of wind.

34. Hmmmm…. You didn’t really explain how a SAILBOAT can sail faster than the wind. Given your explanation friction would have brought your “boat” to a full stop. And guess what, Bernoulli has been disproven. It’s the sheer deflection and Newtons Law that accounts for lift.

35. Say "TOY BOAT" three times real fast…

36. a flat sail is more likely to heel over, but a sail that is curved towards the wind in the middle and tapering away at top and bottom will counter the heeling effect, even if you have to put a float on the bottom of the sail, but you dont have to if the balance is done right, this will give surface area for wind propulsion while maintaining resistance, laterally specifically allowing for even more faster than wind travel, a foil is more sail with less resistance area but way more effective resistance because its all or way more keel, the boat hull becomes less keel and more sail as wind increases, the wind range affects the design decisions so sailboats are too much fixed design with what, reefing as your only option, sails that flex away top and bottom in high wind will maintain forward motion without capsizing faster than the wind

37. For me, you have ruined all the video on the end with pathetic and forced repeating your sponsor name. It's ridiculous how you (both) keep sayin that. it's terrible that you agree to look so stupid just for your sponsor money. I'm leaving here.

38. You could theoretically sail directly into the wind using a windmill driving a propellor below the waterline.

39. love ur videos, i understand that its very simple even without ur video but im not able to explain it so well

40. disappointed with lack of real fluid dynamics here. U can find a lot of videos why "Newton" description used here is wrong

41. Great video. Awesome explanation. No hand waving at all. I would argue that Your presentation was infinitely clearer than the similar video by the other author.

42. It seems that you overachieved with the subscription count – it's currently running 1.73M.

43. It's just that the wind does not blow in parallel with the movement. The whole secret is that this is not shown on the video. And since it blows at an angle, the speed can be higher. The same with the model on the treadmill. At the beginning, the friction force is compensated by holding it with your hand. When the fan spins up, it creates additional thrust. Due to inertia, it spins. But over time it will stop.

44. Food for algorithm 😉

45. Try making a fist🤜 instead of a palm.. will work much better. Maybe try the Vulcan shocker if only wan hand🤭 is available

46. A sailboat on a tack is running at an angle to the wind. The wind is always pushing on the sails. A sailboat never outruns its power source. That contraption is doing the same thing. It's running at an angle to the wind, otherwise it would be outrunning its power source. You cannot travel faster than the wind STRAIGHT DOWNWIND, only at an angle to the wind, otherwise there is nothing powering you. Forward momentum powering the wheels is not a power source.

47. Sorry, but this is the most confusing explanation I have ever heard.

48. I'm fully convinced Derek is a smart enough man to understand that being deliberately slightly controversial, wrong, misleading, or incomplete about a critical piece of information sparks debate, which leads to his channel getting algorithm relevance as the source of it all.
    It's my own little conspiracy theory as to why these "but actually…" videos keep showing up around correcting what was said.

49. As a sailor, I love to see this kind of stuff.
    Another addition to this is that when a sailboat is moving at a certain speed, let's say five knots in 10 knots of wind then the sailboat is experiencing another 5 knots of wind against it because of the speed it's going. This is called apparent wind. So now that boat has 15knots of wind against it. When a sailboat does this and it happens on every sail on a boat if the boat is moving, then you have to pull the sail in to counter the apparent wind. This is because the apparent wind is coming from the direction that your boat is moving or the front of the boat while the real wind on a boat's preferred angle is usually about 120 degrees from the wind. Now your boat has its sail pulled in its wind angle is around 80 degrees even though the boat is pointing in the same direction. This can be repeated for a long while when you have the right sea conditions. This is also why you don't see the GP boats or the AC75s letting their sails out very far. They are trying to capture the apparent wind.

50. Everyone who has a sailboat literally learned nothing lol

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