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How To Fit An 80-Foot Mast Under A 65-Foot Bridge


Dieser Beitrag hat 73 Kommentare
  1. @ToTirDeKK Water weighs 62 lbs per cubic foot. The volume of a sphere is 4/3 π R^3 (radius cubed).

    So then 2000 lbs / 62 lbs per cubic ft. = 32.25 cubic feet

    32.25 = 4/3 π R^3

    32.25 = 4.166 R^3

    R^3 = 7.74

    ∛7.74 = 1.97

    The radius of the ball of water would have to be around 2 feet, so it’s about 4 feet in diameter or about as wide as a sheet of plywood.

    Water gets heavy quick.

  2. я пытался пройти таким способом под иповским мостом в п.Нёнокса на „ЛГ“ у меня не получилось-черпанул воды в кокпит и течением задавило под мост

  3. @ToTirDeKK You’re welcome. I just felt like trying to do some math this morning

    try this: water weighs a little more than 8 lbs per gallon so a ton of water is about 240 gallons.

    Think of a pallet of gallon water jugs. 7 jugs x 7 jugs, 6 layers tall. That’s a ton of water.

  4. @pete1729 still, thanks for your effort but im kinda lost cause‘ im not from the US and our weight system goes with kilos and volume with litres ! but Im kinda getting what your saying lol

  5. @hunterparrot
    Thanks. Very interesting. How stable was this? Would a turn to port or starboard have much effect?
    There used to be a dinghy race around Alameda in San Francisco Bay which required getting your boat under four bridges that your mast could not clear. You either had to heel your boat way over, which often resulted in damage or a capsize, or capsize and swim under. I chose the latter. It required close study of the current tables, since you preferred to swim with the current.

  6. 右に傾いた船をどうやってまっすぐに戻してるのか仕組みが気になる。


  7. sin = Opposite / Hypotenuse

    sin = 65/80 = 0.8125

    arc sin 0.8125 = 54.5 degrees

    90 – 54.5 = 35.5 degrees

    IF YOU WATCH THE VIDEO AND PAUSE IT AS THE KETCH PASSES UNDER THE BRIDGE, you can put a protractor on the screen, and see the angle subtended between the mast and the water is 54.5 degrees.

    A very capable deep water skipper, probably a member of the Seven Seas Cruising Association.

  8. best choreography to a Tchaik waltz EVER! Move over, Baryshnikov! To the stern, Nijinsky! You’re overboard, Balanchine!

  9. Heels that deep are routine under sail in heavy wind conditions. Washing the rails isn’t all that uncommon. With the weight of the keel hanging below, even at that heel it’s pretty stable. That said, you wouldn’t want to do that in a heavy swell. 🙂

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  11. This would make marvellous viewing, not that it isn’t already, were it to be re-recorded with the popular music songs ‚R7yfISlGLNU‘ and ‚NisCkxU544c‘, as it involves being on a boat, but it is being sailed like a boss.

  12. I can’t speak to the calculation used to determine if the mast step was up to the challenge of an extra two tons of weight, although I assure you that was carefully considered. The added stress on the shrouds is irrelevant. There essentially is none, as the rig is designed to survive a knockdown at sea – under sail, a gust of wind pushes the boat completely on her side so the rig is in the water. At that point, the weight of the keel would bring her back upright

  13. LOL. Until that one time at sea, white knuckles on the helm, and you say „F-it, the balls are looking pretty good right now!“

  14. Very good! That was great! What the whole procedure checklist? Fill balls with pump? Drain your balls when done? Is there a valve on the bottom of each ball? Where do you stow the balls to get them out of the way? What’s the scoop? What’s the name of the boat? Is that a ketch? I know it’s not a sloop. I love sailboats but know very little.

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