$10,000 bet for downwind faster than the wind - video

[Jon]

$10,000 bet for downwind faster than the wind. 18:12 video:

Previously:

Raising a wind turbine - GIFs
wind powered sawmill
Wind-powered green vehicle - photo
Enormous wind turbine blade transported over stone arch bridge - GIF
Wind whips around window washer worker - GIF
Wind-powered washing machine - GIF
Wind turbine that folds down for maintenance access - GIF
1956 NACA wind tunnel wall jacks - photo

[NortonDommi]

I have seen a number of videos about this and it is amazing that an academic 'professor' of physics could not understand the logic. Did he not watch the past couple of America Cup series? Boats have been sailing downwind faster than the wind for a while now,(a bit different I know but still a thing).
This is a real world example of a U.E.I. encountering the real world. Good on him for paying up.

[jimfols]

I watched it until 1:07 when the brought in that wacko Bill Nye guy.

[FEM2008]

I watched it until 1:07 when the brought in that wacko Bill Nye guy.

Wacky but Brilliant!!

[Floradawg]

I got ya. Bill Nye wants everyone to think he is a scientist. He is not. He has a degree in mechanical engineering. That doesn't qualify him to scold us about cataclysmic climate change. It was really painful to see him but I soldiered through it because I was interested in the experiment and the wager. I also thought about a sail as an airfoil which propels the boat faster than the wind speed. The treadmill sort of looks convincing but it seems like something for nothing. In other words if you give it a head start with a push in a calm, on a smooth surface, according to the treadmill experiment it should accelerate on is own. It kind of looks like a perpetual motion machine. I know I'm opening myself up for some criticism. I really am not a math genius and I didn't really understand the problem from that angle. For sure it is solvable with math if the problem is set up right. Was it? I don't know.

[nova_robotics]

I dunno. I'm still having a hard time convincing myself that it works. Sailboats going faster than the wind (at an angle to the wind) makes perfect sense. This contraption, particularly when moving in the same direction as the wind? That's a whole other meatball.

[Floradawg]

If you have a starting gear of 30 teeth spinning at 10 rps and another gear downstream of 30 teeth, it doesn't matter what the gears are like in between. The last 30 tooth gear will spin at the same rate as the first. So with a 1 to 2 ratio the last (gray) gear spins at 5 rps.

[FEM2008]

The Tread mill experiment does not constitute perpetual motion since an electric motor powers the tread mill.
There is another example of a small force generating a large lifting force with propeller and it's called the Autogyro. A smaller propeller pushes the aircraft through the air. The air drives the much larger top propeller with enough speed to keep the aircraft airborne. I know this is not the same problem since the autogyro has an engine, but still the main lifting force is not engine driven. I often underestimate the power of properly designed airfoil.

As for a mechanical engineer not being a scientists, that a new one to me. Weather and climate is all about thermodynamics and fluid dynamics period. And among all disciplines, mechanical engineers study both with heavy emphasis on thermodynamics. Heck, that was half of my graduate courses! Thermodynamics is often considered as a weed-out course, as many can't handle it and change majors or dropout of engineering after the first course.

[Floradawg]

I realize the treadmill is a powered device but just think about it. If you place the vehicle on a smooth surface with no wind and push the vehicle as fast as the treadmill belt is traveling, the relative motion between the surface and the vehicle are the same. I bet $10,000 dollars the vehicle would not continue to travel much less accelerate.
Also, a mechanical engineer does not constitute a climate scientist or scientist of any kind in spite of learning some thermodynamics.

[FEM2008]

[QUOTE=Floradawg;184192]I realize the treadmill is a powered device but just think about it. If you place the vehicle on a smooth surface with no wind and push the vehicle as fast as the treadmill belt is traveling, the relative motion between the surface and the vehicle are the same. I bet $10,000 dollars the vehicle would not continue to travel much less accelerate.
Also, a mechanical engineer does not constitute a climate scientist or scientist of any kind in spite of learning some thermodynamics.[/QUOTE

I suppose we just should the arguments to the real climate scientists then: politician, talk show talking heads and armchair climatologists.