Finally a "Sailing Basics" video that actually is instructive. Thumbs up! :D

This is a really nicely put together video explaining sail shape. I liked the way you explained that a deep sail is like low gear and a flat sail is high gear, I never heard it put that way and I found that comment really helpful.

I came straight to the comments when I saw the floppy drive! Ha ha!

Excellent instructional video, very helpful. Thanks for post :-).

It's a basic lesson, but it isn't for basic people. It's great. Thanks.

You are a great teacher. I am greatful for the tutoring me. This was exactly what I learned in my first Sailing Lesson. Thank you, once more you have help me understand the physics of sailing.

@roborobot1509

7 жыл бұрын

Based on the comments, apparently this guy didn't explain the physics of the sail very well. I'd maybe take it with a grain of salt.

The story about the reunion of the air particles will never die ...

@d.haroldangel241

4 жыл бұрын

Yup. Hard to kill.

This is an excellent tutorial.

Excellent explanation

Excellent video!

I came back to this video because I don't quite understand the principle of how heeling causes the keel to act like a sail underwater, allowing the boat to move to windward. How does that effect differ from weather helm, where automatic turning into the wind is from the center of effort being aft of the center of resistance?

My mind has been expanded

I enoyed seeing a flopy disk at 6:06. The comments before mention this as the best part. Thanks again for history and theory.

Très bonne vidéo ! merci

yep, the program came on floppy disks, I have had a copy of this video for about 20 years, North Sails

QUESTION ( raising my hand ) 4:28 into the video, does that mean 1) if i am designing for a single sail i should increase my SA\D ? or 2 ) i just need to design the one sail like it's one sail ? #1 i can do, and #2 i would need a sail specialist...but i have to know if it's #1 because that would affect the mast and rigging.

Someone needs to wake up Bernoulli from his slumber and tell him he's full of it, I guess.

That's a computer? Damn! History is a relevant subject.

Kevlar does terrible with UV?

How do you know when the air flows on each side of the sail a vacuum doesn't exist? Its like the air flow on each side of the sail are talking to each other saying: now guys make sure we meet at the same time or else a vacuum will be created!

Your explanation of how a "wing" works is wrong. The theory about the airflows travelling different distances and "having to meet" at the trailing edge has been discredited. Think about it, how then could an aerobatic plane with a symmetrical wing section fly? see: www.grc.nasa.gov/WWW/k-12/airplane/wrong1.html

@johnluftenberg1130

10 жыл бұрын

Absolutely correct, and my thoughts exactly. Amazing how much misinformation gets passed along as if it were factual.

@johnluftenberg1130

10 жыл бұрын

John Luftenberg Though in fairness, airplane wings and boat sails is an apples to oranges comparison since a wing is a solid airfoil and gets at least some of its lift from deflecting the incoming airstream downwards.

@borthewolf3376

9 жыл бұрын

John Luftenberg Yes, and according to the BS theory an airplane cannot fly upside down. Please tell those brave Airforce Pilots not to fly upside down in a dog fight, the theory says it is impossible!

@queenofyeay

8 жыл бұрын

+Peter Worsley No, no no little pixies lift an airplanes wing by flying across the surfaces passing very quickly over and under the wing! If your way was true they would never meet on the far side of the wing! Pixie's get very lonely if separated and they rush across the wing on either side to meet at the trailing edge. It's Orville and Wilbur's greatest discovery!

@shahanaperveen9821

8 жыл бұрын

and no modern jet fighter would fly lol

If one will disregard the explanation of how a wing works with the air flow, which is still used today in sailing classes , then the rest is good info still to today.

i saw a floppy disk!!!

@etneide

4 жыл бұрын

.. on a M24 Olivetti PC :-)

I feel that not only the explanation of the wing physics is wrong, also the keel part is confusing and probably wrong. I think there is lot of bad advise with regard to sail trim out there

The butler did it.

Go and measure th distance on each side of the sail please. You may find out that the equal time theory does not hold up.

The explanation at 0:48 is total nonsense. "The parted particles have to meet at the other end..." No they don't. They don't meet. And furthermore, the air on both sides travels exactly the same distance. Actually, the air touching the sail doesn't really move at all.

@andinbriwel1092

8 жыл бұрын

You should create a video explaining this, especially the part about how air in wind is not moving.

@jvodan

5 жыл бұрын

That's how it was taught in physics lectures on laminar flow, though not meet but join.

There are a ton of wrong statements about aerodynamics of the keel.

lol

The explanation about how the sails work is wrong. Particles of air do not have "to meet at the end". The air on the top of the wing/sail travels much faster and never meet the same air at the bottom. The faster air has less density than the slower air thus it pushes the wing/sail into the low pressure area.

56 seconds in and it's clear the narrator has no idea about aerodynamics!

Ah god not another meet at the other end lift explanation. That is so wrong it's hurts wrong's feelings.

Too bad this is far from the basics. From a total beginners point of view 90% of the sailing jargon and terms went over this boys head. A basic sailing video should explain sailing terms and then how to apply them. This video missed that for me anyway. Guess I need a basic sailing video.

I was like "this is good info..."until I saw that floppy. Any "UPDATED 21st century data"?

@carolw1766

5 жыл бұрын

You think the laws of physics have changed since the floppy scene?

HUH?? This is like a freshman in a graduate school physics class. Meh.

As a beginner to sailing, almost 10 minutes of my life wasted. This is not for beginners at all. Why do i need to know about a racing main sail!!! Sorry, but very disappointing.

@Liofa73

8 жыл бұрын

I don't even sail, but I understood it... Maybe you're just not that smart?

@jonknights9343

8 жыл бұрын

+Liofa whatever, but I'm not the only person that wasted time on this.

Terrible. Confusing. Not "basics" at all.