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ITSA General Assembly: December 5th - 12th

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 51 
 on: August 19, 2019, 04:56:44 AM 
Started by Taka - Last post by Jeremy McCreary
Gorgeous!

 52 
 on: August 19, 2019, 03:06:13 AM 
Started by andydecleyre - Last post by Jeremy McCreary
This is interesting. Unfortunately, I discovered that I don't have suitable bowls. Ikea opened a shop over here several months ago. It's time I give it a visit.

I re-read Martin's patent: It covers both bowls and flat plates. However, it explicitly mentions that the spin and orbit directions have to be the same. So it only covers forward regens.

Martin's bowl looks like it's shallower than mine. I'll have to try to find one like it. Does the patent give measurements?

Wonder how fast he got his top to orbit and spin in the bowl? In one video I timed, the black and white top above turned in maximums of ~1.3 m/s in orbital speed and ~1,200 RPM in spin rate with the tip as close to the rim as I dared. The initial spin rate was maybe 40% of that. A skilled player could have sustained these speeds indefinitely.

For the counter the top mostly remains vertical and precesses little. However for forward regen I am guessing that if you match the orbit period with the precession period you get the smoother movement.

Just what I've observed, both on flat arenas and in the bowl.

 53 
 on: August 19, 2019, 02:08:05 AM 
Started by jim in paris - Last post by jim in paris
it probably belongs to NSTR : agreed :'(

very nice post card : the wiggle woggle seems much larger than in the 1st pic


jim

 54 
 on: August 19, 2019, 12:06:38 AM 
Started by ta0 - Last post by ta0
The freestyle videos are up:

https://www.youtube.com/watch?v=IdC2nnrcWB0

https://www.youtube.com/watch?v=HB7wmtXTpMA

https://www.youtube.com/watch?v=mEtN-lzARc0

https://www.youtube.com/watch?v=fEk9iKGfHYE

https://www.youtube.com/watch?v=KqpPegOUkrg

https://www.youtube.com/watch?v=0a3dq-cQezM

https://www.youtube.com/watch?v=-qPozQkTGDU

https://www.youtube.com/watch?v=Jd8EstYQlMM

https://www.youtube.com/watch?v=q1iUxNVgSEs

Eli's is missing but I just wrote to Steve.

 55 
 on: August 18, 2019, 11:45:33 PM 
Started by andydecleyre - Last post by ta0
This is interesting. Unfortunately, I discovered that I don't have suitable bowls. Ikea opened a shop over here several months ago. It's time I give it a visit.

I re-read Martin's patent:



It covers both bowls and flat plates. However, it explicitly mentions that the spin and orbit directions have to be the same. So it only covers forward regens.

Quote
Before answering your questions, wondering if the top's orbiting motion about the bowl's vertical centerline is really a gyroscopic precession in the usual sense? The top's nearly constant small inward tilt while orbiting is surely maintained gyroscopically. But the orbiting itself seems more like just rolling tip travel around a banked circular track.

So to be safe, I'm sticking with "orbiting" for now.
I was mentioning precession just to define the direction of the orbit as forward or counter. For the counter the top mostly remains vertical and precesses little. However for forward regen I am guessing that if you match the orbit period with the precession period you get the smoother movement.

 56 
 on: August 18, 2019, 11:41:06 PM 
Started by Taka - Last post by ta0
Nice fighting top! I guess you added to the classic design (from the city of Himeji, close to Osaka) those screws that give it more weight.

PS: Moving this to buy/sell

 57 
 on: August 18, 2019, 11:26:38 PM 
Started by Myk_Myk - Last post by ta0
Also, I recorded a trick! Hopefully it's not total sacrilege to post a yoyo trick here?  :P

Is that called a Return Top?
Let's hope so or it's going to the NSTR . . .   ;D ;D ;D ;D ;D

 58 
 on: August 18, 2019, 11:11:33 PM 
Started by Myk_Myk - Last post by Myk_Myk
It was just me and one yoyo player this week.

I did show a couple of top tricks to one of the guys renting in my building, who came in to chat.

Also, I recorded a trick! Hopefully it's not total sacrilege to post a yoyo trick here?  :P


 59 
 on: August 18, 2019, 10:27:47 PM 
Started by Taka - Last post by Taka
Traditional Koma and got approval from Himeji Lord few hundred years ago,then became authorized Koma by Lord.Use green and red combination with gold color line.
Samurai Koma is new design and 120g Koma can crach other Koma easility.




http://spingear.jp/index.php?dispatch=categories.view&category_id=493

 60 
 on: August 18, 2019, 09:47:59 PM 
Started by andydecleyre - Last post by the Earl of Whirl
We got started on this bowl from this classic spinning top circus video.  I think johnm was the one who pointed me to the IKEA sale.....

https://m.youtube.com/watch?v=LDXAhwhsZ9k

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