25 Comments

  • quosmo1

    April 26, 2014

    what about when a boat loses its keel (on a reef or some such), they still
    sail … forwards! albeit less efficiently and somewhat dangerously, they
    still ‘work’ from a momentum perspective. their forward moment is still
    greater than the leeway, even without a keel.

    this kind of ‘lift’ theory of aerodynamics has (in the past decade) been
    quite disputed in the field of aerodynamics anyway, as many experiments
    with airfoil (wing) designs which should not create any lift according to
    this theory – do!

    so this is not the whole story. it may play a part (maybe even a large
    part) but its not a complete explanation of whats going on.

  • SuburbAllied

    April 26, 2014

    7:47 watch the two sailboats and the motorboat, above the sailboat with the
    red sail – almost a bonus clip with a sail disaster, and a lesion by
    itself; How to NOT maneuver a boat in crowded situations. 

  • Disabler

    April 26, 2014

    Scientists are terrible at explaining things lol

  • PLISKEN12

    April 26, 2014

    wishy washy kinda

  • Gilbert Pilz

    April 26, 2014

    Hard to take this seriously when the first thing they say is completely
    wrong. Square-rigged ships can most certainly sail into the wind. It’s true
    that they can’t lie as close to the wind as a fore-and-aft rigged ship, but
    they can tack.There’s no way Magellan, Drake etc. could have made it around
    the world in ships that only sailed with the wind. Getting around Cape Horn
    from east to west is impossible if you can’t sail your ship into the wind.

  • Yann Rousselot-Pailley

    April 26, 2014

    Comment marche un voilier ? Voilà la (les) réponse(s) !

  • bryan patterson

    April 26, 2014

    Good video about generating lift from the sails and countering it with lift
    from the keel… how to shape your sail so the tell tails are flying
    instead of hanging… hmmm, reminds me I need to clean up my tell tails so
    they aren’t so fuzzy!

  • Sugarsail1

    April 26, 2014

    a luffing sail and a stall on an airplane wing are not aerodynamically
    equivalent.

  • Timothy Horita

    April 26, 2014

    Hey guys. Here’s a neat video explaining the physics of sailing into the
    wind (old square sail ships couldn’t do this)

  • Ian Edmonds

    April 26, 2014

    That was fun.
    Thanks

  • Mike Collins

    April 26, 2014

    “Square rigged ships only went in one basic direction – with the wind”
    PARDON?! Clearly, this statement is false. What did they do if the wind
    changed, or if they had to return home against the trade winds?
    In fact, square riggers, while not as efficient to wind as a modern sailing
    boat, could sail at a reasonably close angle to the wind.

  • Levi Partridge

    April 26, 2014

    lol lucky you’re doing it somewhere warm and not somewhere freezing like
    Hamworthy (Poole, UK)

  • Sergio.J.V.

    April 26, 2014

    Lift (in sails as in wings) is generated according to Newton’s 3rd:
    http://www.grc.nasa.gov/WWW/k-12/airplane/lift1.html

  • David Galamov

    April 26, 2014

    the most idiotic video ive ever seen!(from the eyes of a sailor).

  • Christopher Koffel

    April 26, 2014

    1:52 I was dying that that jib sheet wasn’t being pulled!

  • John Wilson

    April 26, 2014

    “A luffing sail is not the equivalent of stall on an aircraft”, per minute
    7:40, it would be an over-trimmed sail.

  • Ali Nazari

    April 26, 2014

    Fantastic 

  • aidtry182

    April 26, 2014

    I’ve always been so fascinated on how sailing ship works!!

  • detonatorJE

    April 26, 2014

    Hey guys, just a note about why lift happens, this guy is chatting bull.
    Bernoullis law doesnt apply in the case of a wing (or sail). For his law to
    apply, certain assumptions must be made. firstly that the fluid has zero
    viscosity, but as we can see, the fluid ‘sticks’ to the shape of the wing,
    which is a viscous effect. secondly, that it is a steady flow. which as
    said in the video, it is not. Finally, Bernoullis theorem only applies to a
    single flow, once you talk about flows above and below a wing, its moot.

    While Bernoullis can describe some of what is happening, the fundamental
    law behind lift is newtons 3rd. watch the flow as it comes off the wing,
    its at a different angle, meaning a force was imparted on the air by the
    wing, and thus vice versa

    (im an aerospace engineering student and even people in the aero business
    get this wrong (including the most of the internet), and this isnt coming
    from me, this is coming from Dr Iain Dupere at Manchester University)

  • Saraleah Sands

    April 26, 2014

    When you blow on that piece of paper, does the Coanda effect help create
    that lift ?

  • Raysnom II

    April 26, 2014
  • Ryan Rodgers

    April 26, 2014

    Your model desperately l lacks sail trim. Move your jib cars back and for
    the love of god, tighten your outhaul!

  • ageliki moulos

    April 26, 2014

    How do you guys (the sailing school) get away with completely inadequate
    safety equipment for students? And then comically prodcast it to the whole
    world via youtube. You should be closed down by the US authorities. Boyancy
    aids. are not suitable life savers for offshore yacht sailing!! Inshore
    dinghysailing with supervision maybe……….

  • Kirk R

    April 26, 2014

    I always thought that if I were to travel back thru time, this would be one
    of the most valuable bits of knowledge to have.

  • Kronstadt Sailor

    April 26, 2014

    SQUARE RIGGERS CAN SAIL TO 90 DEGREEZ FROM FROM DA WIND

Comments are closed.