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Sail Faster than Wind (Physics Demonstration)

69.4k Chancey21  3.5 years ago

It's real, check every part

This craft sails directly forward in a 15 mph wind and goes 19 mph ground speed




This build was based on and inspired by a newly released Veritasium video. In the said video, a craft is shown to sail directly with the wind, faster than the wind. I was gripped by an urge to understand how this could possibly work, so I provided a physics demo in SP for everyone to dissect.
Thanks,

General Characteristics

  • Created On Mac
  • Wingspan 24.1ft (7.4m)
  • Length 30.2ft (9.2m)
  • Height 18.2ft (5.6m)
  • Empty Weight 192lbs (87kg)
  • Loaded Weight 192lbs (87kg)

Performance

  • Wing Loading 1.8lbs/ft2 (9.0kg/m2)
  • Wing Area 104.9ft2 (9.8m2)
  • Drag Points 27955

Parts

  • Number of Parts 498
  • Control Surfaces 0
  • Performance Cost 1,459
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    10.9k VChart

    I want to modify it to sail on the sea behind the beast and catch up with the beast without any fuel!

    +2 3.5 years ago
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    360 Damirruki

    Oh, I looked up about it in a Veritaseum video recently.

    +2 3.5 years ago
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    16.5k DarDragon

    Simple explanation and why it won't work with an electric generator: The reason it works is because the power to the propeller is dependent on ground speed, or how fast the wheels move along the ground. When the machine reaches wind speed or when its IAS = 0 through normal means(the air pushing the craft), its GS would still greater than 0, therefore, the wheels would be powering the prop. And when a prop is powered at 0 IAS, the craft would tend to move in the direction of thrust. With a generator(connected to the turbine), the generator would also be dependent on IAS, so it would never be able to go past wind speed.

    +1 3.5 years ago
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    26.7k FishMiner

    @Chancey21 what I was trying to say was if you could use a geared prop hooked up to gyrocopters main rotor to counter the downwind drift of the machine, think a kite that can stay in the air without a string attached. Propulsion would be provided by other means.

    +1 3.5 years ago
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    69.4k Chancey21

    Impossible, because you can’t recover enough energy from the wind to sail directly into it... I think @FishMiner

    3.5 years ago
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    38.7k UltraLight

    I couldn't love Veritasium more

    +1 3.5 years ago
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    26.7k FishMiner

    hmmmm, I wonder if instead of wheels I used a prop, like how a gyrocopter rotor works, but geared to another rotor to make an unsupported wind powered airship

    +1 3.5 years ago
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    44.3k rexzion

    hacks

    3.5 years ago
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    to be honest, i saw the video and dispite some factors make sense, i couldn't understand the full picture of the thing

    +2 3.5 years ago
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    69.4k Chancey21

    I might try one with zero mass/zero drag @AWESOMENESS360

    3.5 years ago
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    this hurts, but it’s a good kind of hurt

    +1 3.5 years ago
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    Perpetual Motion Machine when?

    +1 3.5 years ago
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    15.5k Johnnyynf

    oh wow

    +1 3.5 years ago
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    That moment when everyone catches up with the engineers for the America's Cup! LOL

    +1 3.5 years ago
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    13.9k ChrisPy

    @Chancey21 yeah my college is rlly cool i gotta flex a bit lol

    +2 3.5 years ago
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    69.4k Chancey21

    Awesome @ChrisPy

    3.5 years ago
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    13.9k ChrisPy

    yessir im studying to be at least i graduated the 14th and am now a freshman aerospace engineer i get to work with spirit, cessna, bombardier, dassault, airbus, and some others. @Chancey21

    +4 3.5 years ago
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    69.4k Chancey21

    Are you an aerospace engineer? @ChrisPy

    3.5 years ago
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    13.9k ChrisPy

    that moment when you break an aerospace engineers mind 😃
    you hurt me lol

    +3 3.5 years ago
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    69.4k Chancey21

    technically yes, But that is not sustainable. What makes this craft special and seems to defy logic is that is can infinitely drive at higher speed than it's tailwind @asteroidbook345

    3.5 years ago
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    If you’re using a wind turbine powering a generator wouldn’t it be possible to store the energy in a battery and then drive faster than the wind while recharging the battery in the oncoming wind

    3.5 years ago
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    9,409 Tookan

    Intriguing

    +1 3.5 years ago
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    Cool

    3.5 years ago
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    59.6k PapaKernels

    What?!? One of the few times confusion is beautiful.

    +1 3.5 years ago
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    69.4k Chancey21

    Thank you @Khanskaya

    3.5 years ago
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