Forces acting on the windsurfing sail

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This crude animation is meant to explain forces acting on the windsurfing sail. It should help some beginners to avoid typical mistakes in a stronger wind, learn faster, and enjoy windsurfing sooner.
published by www.na-windsurfing.com

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Windsurfing sail forces

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    Popular Comments:

florinsi . 2018-09-19
Great video ... thank you !
121 2 . Reply
Eon Ang . 2018-09-10
Finally found the easiest way to understand sailboat physics. Thank you so much
121 2 . Reply
Alan Haslop . 2018-04-05
Outstanding! I've been sailing for years and have just started learning to windsurf. This is a very succinct overview of how wind affects a sail. In fact, if you ignore the footstraps and rider position, this applies to any sailing boat, mono or multi-hull. I salute the author on an excellent job well done!
121 2 . Reply
Miles Walker . 2017-10-10
A good explanation, thank you.
121 2 . Reply
Petra Walters . 2017-07-28
yu call it a crude animation? I found it very helpful. Now I understand why I wuz having so much trouble as a beginner. I hav bin pulling past the 18 degree envelop. This is ritten in the new trending Inglish.
121 2 . Reply
Tristan Bach . 2017-06-30
Dude, this makes so much more sense. Thank you!!
121 2 . Reply
Damian Ketcham . 2017-05-31
Nice video!!! Thanks for taking the time to help the windsurfing community. 👍🏻
121 2 . Reply
Binbin Xiong . 2016-10-11
OMG this is aweeeeeesooom huge thanks!
121 2 . Reply
chreif . 2016-09-29
what I have been looking for...do more of this pls. thanx
121 2 . Reply
barney barns . 2016-08-29
Somethings wrong or missing with this theory. The resulting force will always be downwind. To go upwind there must be a force acting against the drag to counter act it. Also when I look at someone surfing it looks like their sail angle is much more than 18 degrees even when going very slow with little induced wind.
121 2 . Reply
Valet Privet . 2016-08-13
best explanation ever
121 2 . Reply
justinbianchi . 2016-07-31
Thank you so much for this video it has helped me thrive in my beginners class
121 2 . Reply
vempo . 2016-07-26
Great video. in fact, the best out there for beginners to understand the science and practicality of windsurfing.
The idea to use a "top-view" to illustrate the wind force is brilliant. Thanks a lot.
121 2 . Reply
Guy next door . 2016-06-01
Awesome video!
121 2 . Reply
Justin . 2015-08-21
The wind is blowing from right to left, but why the resulting force direction is upper left? Thanks!
121 2 . Reply
zytigon . 2015-05-22
Thanks, good explanation.
121 2 . Reply
nawindsurfing . 2014-02-04
What happens (at speed) if you open the sail outside the 18 degrees? You will slow down, until the sail will be back in the 'green' zone. Forcefully pulling you front (mast) arm is called emergency break :-) 
121 2 . Reply
Alvaro Vallejos . 2013-10-17
Thank you very much, I understood lots from this video. What happens (at speed) if you open the sail outside the 18 degrees? (clockwise in your diagram)
121 2 . Reply