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  1. T

    Physics brainteaser

    Thanks gwb. It's a bit of an off topic here on Elite, but there are science and physics forums with threads and posts totalling more than 100K. There is one thread alone arguing about this project that has more than thirty thousand posts on it. Most still consider it impossible even while...
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    Physics brainteaser

    The Discovery Channel segment on the Blackbird: http://watch.discoverychannel.ca/daily-planet/may-2010/daily-planet---may-04-2010/#clip298008 And even after a full day of discussion, even the Discovery Channel got it wrong ... the blades do *not* turn the wheels. JB
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    Physics brainteaser

    For those in Canada, a segment on this topic is being aired today on the Discovery Channel's Daily Planet show. JB
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    Physics brainteaser

    Thanks, it is a fun topic for some ... very frustrating for others. So I can better respond, would you mind being more clear on which video you are calling "the first video"? I'm not sure if you're going back a year on the thread or my more recent postings. Thanks JB
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    Physics brainteaser

    I'm quite certain it's a proof of 'directly downwind faster than the wind', rather than 'push and pull are the same'. But then that's just me. LOL JB
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    Physics brainteaser

    Here's a recent write up in Sail Magazine (the issue will be on newstands in the next few weeks). http://sailmagazine.com/racing/running_faster_than_the_wind/ JB
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    Physics brainteaser

    Hi Wayne Actually, it's a *turbine* cart that can move directly upwind, rather than a propeller cart. Conversely a turbine cart can't exceed the speed of the wind while going dead downwind while a propeller cart can - different applications, different tools. It is true that because of...
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    Physics brainteaser

    http://www.fasterthanthewind.org/2010/03/sweet-success.html http://www.youtube.com/watch?v=7SYvg40NHtc http://www.youtube.com/watch?v=aDzWh9J1dk4 Entire San Jose State University project blog at www.fasterthanthewind.org
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    The Billionaire Soccer Club

    I was actually at the game on Sunday when Aston Villa knocked Newcastle out of the EPL. Just got back to the US last night. The score didn't reflect how badly Newcastle got beat -- Aston Villa were just sooo much faster. Was also at the game in Portugal when Manu knocked Porto out of the...
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    Physics brainteaser

    Well, in the above exchange (all posted months ago), I don't believe I managed to convince a single person that it's possible to build a wind powered device that can go directly downwind, faster than the wind, powered only by the wind, steady state. Fair enough, but it IS possible and rather...
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    Physics brainteaser

    Well, first off a little one works just like a big one. That's exactly right if you are sitting on the cart chassis. However if you were sitting on the propsail you would feel lots of wind as the propsail is moving relative to the cart chassis. At any speed, the power comes not from wind...
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    Physics brainteaser

    Haroki, I know this may sound silly on something so simple -- but you're pretty sharp to catch that above. Of the hundreds I have discussed this with, many say "windtunnel, windtunnel, windtunnel" without realizing that you would have to turn this device *around* and run it the 'wrong way'...
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    Physics brainteaser

    *Our* video cut Jacks video up to fit our dialog. Jacks video is uncut: http://www.youtube.com/watch?v=aJpdWHFqHm0 The at the start of the video, the streamer blows to the front because is a tailwind. The streamer starts to hang and wander as the cart approaches and passes through the...
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    Physics brainteaser

    You'll have to explain the "problem" with the remote steering. Nope -- from the side it was filmed you just couldn't see that there is a long stick holding the streamer out to the *side* (other side from the camera). The streamer is no where near the camera. Find the enitire video of the...
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    Physics brainteaser

    Yes I am. :-) Here is our entry into the MythBusters Video challenge. http://www.youtube.com/watch?v=4GOlSi-2p3g JB
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    Physics brainteaser

    Hi haroki. It's powered by the differential movement between two mediums. If I put it in the wind tunnel, it's the electric motor moving the air and creating that differential. If I put it on the treadmill, it's the motor moving the rolling surface creating that differential If I put...
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    Physics brainteaser

    Yes, and on the other end of that equation is the prop -- and the wind can "couple into the vehicle whatever is needed (within the limits of the diameter and L/D ratio of the prop). It truly is the same as the age old "when you pull on a rope tied to a tree -- who's keeping the rope tight...
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    Physics brainteaser

    You do notice the "powered by the wind" requirement in the original statement don't you? JB
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    Physics brainteaser

    Wayne, it's impossible to be "introducing essentially unlimited energy" into the system -- the device can only absorb as much power through the wheels as the prop can push on the air -- which happens to be exactly the same as the wind. When you put a tension scale between two ropes and pull...
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    Physics brainteaser

    Uhhh yes. LOL -- your rollers simply don't have enough inertial resistance to throw you over the handlebars. If the earth was as light as your rollers it wouldn't happen in real life either. Try again on a set of rollers that has a few hundred pound of rotational inertia and tell me the...
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