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REGISTRATION OPEN FOR 2020 WORLD SPINTOP ONLINE CONTEST

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 1 
 on: August 08, 2020, 11:50:08 PM 
Started by Free - Last post by paxl13
You need a cap or a bit of ingenuity. But the hollow point or hornet without its cap is a hard top to manage!!! Others may be able to link you some videos!!!

Good luck
Pax

 2 
 on: August 08, 2020, 11:11:28 PM 
Started by Free - Last post by Free
I have a top I believe was made by Spintastic, it’s made of metal and you can nest one of his small plastic tops inside. I can throw them together but I’m trying to figure out how to wrap the metal top by itself since it has no top section to put the string around. Any help would be great
Thanks
Free

 3 
 on: August 08, 2020, 12:30:07 PM 
Started by ta0 - Last post by Jeremy McCreary
Just out on Veritasium -- a (kind of) intuitive explanation of the T-handle's flipping behavior...

https://youtu.be/1VPfZ_XzisU

The famous mathematician who came up with this so-called "intuitive" explanation of the flipping behavior of triaxial bodies (like tennis rackets, T-handles, and wing nuts) has since revised it -- and complicated it a good bit in the process.

Which prompted this purportedly "more intuitive" explanation based on the 3D intersection of a triaxial body's energy and momental ellipsoids...

https://youtu.be/l51LcwHOW7s

This one explains how a triaxial body can flip while conserving, as it must, both its kinetic energy and the magnitude (though generally not the direction) of its angular momentum vector. (More on how these necessities actually constrain the body's observed motion here.)

Problem is, this 2nd "explanation" doesn't explain why T-handles and wing nuts in space routinely take this opportunity to flip, and to routinely keep flipping back and forth at seemingly regular intervals. Hopefully that strength of the original explanation survived the revision (which I have not read).

 4 
 on: August 08, 2020, 08:46:46 AM 
Started by ta0 - Last post by ta0
We need a promotional video for Worlds. Any volunteers to share the work?
You can use clips from freestyles (e.g., latest winners) and photos from previous world contests. Perhaps also images for top play around the world.

 5 
 on: August 08, 2020, 06:01:19 AM 
Started by jim in paris - Last post by Attila
Hello!
Sorry for not reacting before and didn't vote for our new ambassador. Not that it matters now but would have had no objections whatsoever so let me also welcome you to the borad Mark!

 6 
 on: August 07, 2020, 10:43:52 PM 
Started by ta0 - Last post by ta0
This is a a very nice example of transfer of spin (but requires great skill!)



And this is a good example of transfer of linear momentum  :)



 7 
 on: August 06, 2020, 06:13:59 PM 
Started by ta0 - Last post by ta0
This early we have 7 competitors representing 6 countries (USA, Hong Kong, Uruguay, Balearic Islands, Japan and France) already registered:

6 - Open Freestyle (including 3 previous world champs  ;) )
2 - Traditional Freestyle (both also do Open)
1 - Sport (13 yr. old)

I have translated to Spanish the rules and registration pages (still missing the ladder list). If somebody wants to volunteer to translate to another language, just pm me.

 8 
 on: August 06, 2020, 03:03:23 PM 
Started by ta0 - Last post by the Earl of Whirl
Now the governor of Ohio has tested positive!!!  He was on his way to meet with Trump in Cleveland.  Hope everyone is safe out there in the spinning world.

 9 
 on: August 06, 2020, 02:14:52 AM 
Started by Pepe - Last post by Mermouy
It's actually a great draft!
Few corrections and a good music will make it insane!
Have good time with your family Pepe!

 10 
 on: August 05, 2020, 10:21:54 PM 
Started by Jeremy McCreary - Last post by the Earl of Whirl
Ha ha!!!  Bigger moths to flames.  I like that!

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