if anyone reading this has a big bird big wheel, whether it's worn or in perfect condition, I am EXTREMELY interested in purchasing it. Please email me at
anne.shutt@gmail.com
I am also aware that this toy was recalled in 1990, and only 2000 of the toys were sold, but this makes it a million times harder to find. Thank you and please don't be shy in emailing me about this!

dupe of http://www.videosift.com/video/Thrillbillies-Travis-Pastrana-on-a-Big-Wheel

This video has been declared a duplicate; transferring votes to the original video and killing this dupe - dupeof declared by rasch187.

*dupeof=http://www.videosift.com/video/Thrillbillies-Travis-Pastrana-on-a-Big-Wheel

dupe

http://www.videosift.com/video/Thrillbillies-Travis-Pastrana-on-a-Big-Wheel

>> ^maximillian:
3rd attempt? Can we see the previous two?


Here's attempt one:
http://www.videosift.com/video/Thrillbillies-Tricycle-Back-Flip-First-Attempt-20

Tags for this video have been changed from 'big wheel, pastrana, jump, nuts' to 'big wheel, pastrana, jump, nuts, suit' - edited by Haldaug

I am not sure about the direction, but the speed seems to be because one revolution of the big wheel equates to several revolutions of the smaller wheels.

Rottenseed is right.

Think of it this way: If the net force on the cart system is applied to the right, then the system will accelerate to the right. For the cart to move right, the small wheels must rotate clockwise, and this motion must translate to the big wheel moving counter clockwise.

Easy stuff. The ruler pushes on the big wheel. The contact between the 2 produces static friction. According to Newton's 3rd law, every action there is an equal but opposite reaction so you end up with this chain reaction.

ruler pushes on big wheel to the right-->big wheel pushes back to the left-->contact with little wheels then causes them to go to the right-->wheels push on ground-->ground pushes back...cart goes right.

The reason it goes faster than the ruler is because of mechanical advantage. (Distance from effert exerted)/(Distance resulting from effort)

I'm curious to know why the big wheel moves in the opposite direction of the ruler. My best guess is that it has to do with the small amount of surface contact, but I don't know for sure. I think I understand why the cart moves faster than the ruler, although it's hard for me to put into words, and I'll probably look really dumb if I try.

this is actually a dupe of mine http://www.videosift.com/video/Why-not-to-tow-a-big-wheel-with-an-ATV

Worked like a charm. http://www.videosift.com/video/Why-not-to-tow-a-big-wheel-with-an-ATV

Thanks.

In reply to this comment by kronosposeidon:
Lucky said he fixed it:

http://www.videosift.com/talk/MySpace-videos-wont-embed-for-members-below-gold-star-level#comment-464002

So give it a whirl again. If it doesn't work post a comment in my Sift Talk post or tell lucky or dag directly. Good luck!...

Tags for this video have been changed from 'Burden, Chris, Art, Sculpture, Kintetic, Installation, American, Big wheel' to 'Burden, Chris, Art, Sculpture, Kinetic, Installation, American, Big wheel' - edited by kronosposeidon

The rigidity is important to a certain limited extent. A tire that is ideally rigid will flex at the beginning of the ramp, then snap back to it's normal shape right at the end, adding an extra elastic force to push it up from the jump. A tire that is too rigid will not take advantage of this, and one that is too elastic will not recover enough of it's original shape to take full advantage of the ramp's incline.

In the same way, where a correctly weighted tire will force the ramp down and then back up in time to add a lifting force to it's launch, too massive of a tire will push the ramp too hard, so it really depends arbitrarily on the construction of the kick ramp.

Other than the rigidity, the grip of the tire on the green will affect how much of the initial potential energy is retained for jump speed. You'll notice how some of the tires grip the launch ramp pretty well, while others begin bouncing and skidding down? The ones that begin to skid don't pick up as much speed as the others, and consequently don't fly as far.

Next to the rigidity affecting grip and launch angle, and tread affecting grip, it seemed like air resistance was negligible. Though the heavy machinery tire would have been the only one considerably less influenced by air resistance, it didn't count because it literally destroyed any experiment.

It's fun to think about what is affecting these, but still isn't the real point of the whole thing to see some big wheels fly high up in the air and then come crashing down!?