[robocup-humanoid] Seven "Size 1" Soccer Balls

Jacky Baltes jacky at cs.umanitoba.ca
Mon Jun 8 08:01:15 EDT 2015


Excellent.

On Mon, Jun 8, 2015, 5:11 PM 赵明国 <mgzhao at mail.tsinghua.edu.cn> wrote:

> Hi all,
>
> I have asked the site-team to buy size 1 and size  5 balls under my
> suggestion two weeks ago. Maybe I could get some sample or picture and data
> of the balls within a few days. Pls wait for some time.
>
> Best,
> Mingguo
>
> ++++++++++++++++++++++++++++++++++
> 赵明国 博士
> 北京清华大学自动化系
> 控制理论与技术研究所 100084
>
> 邮件: mgzhao at mail.tsinghua.edu.cn
> 电话: 010 627 94322
> 传真: 010 627 86911
> ++++++++++++++++++++++++++++++++++
>
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> ++++++++++++++++++++++++++++++++++
> Dr. Mingguo Zhao
> Dept. of Automation, Tsinghua University
> Beijing, China, 100084
>
> Mail: mgzhao at mail.tsinghua.edu.cn
> Tel:   (86) 10 627 94322
> Fax:  (86) 10 627 86911
> ++++++++++++++++++++++++++++++++++
>
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> 在 2015年6月8日,下午1:59,Jacky Baltes <jacky at cs.umanitoba.ca> 写道:
>
> Hi,
>
> Since this translates to a difference in diameter from 10 to 15 cm, I think
> that matches the definition of approx 13cm. So I do not see an urgent need
> to change the rules.
>
> Teams need to be prepared to play with different types of balls.
>
> It would be best if the LOC would send some pictures of the balls that they
> decided upon, so that we can post them to the mailing list.
>
>
>
> On Fri, Jun 5, 2015 at 1:15 PM Sean Luke <sean at cs.gmu.edu> wrote:
>
> On Jun 2, 2015, at 4:38 PM, Luis F Lupián <lupianl at ieee.org> wrote:
>
> The second and fourth balls from the left seem to be size 0 rather than
>
> size 1. When I was shopping around for size 1 balls I realized that some
> vendors incorrectly offer size 0 balls as if they were size 1.
>
> Hmmm, one of those "size 0" balls is not a fly-by-night ball: it is a
> Wilson.  I don't think they'd label it size 1 incorrectly.  My googling
> also doesn't reveal a size 0 :-(.
>
> I have measured the balls in question.  The smallest balls (what you
> thought might be "size 0") have a circumference3 of 41.5cm.  The medium
> balls are around 46cm.  The largest ball is 48.5cm.
>
> Given all this, I suspect that in fact there is no FIFA definition of a
> "size 1" at all, only a large, vague size range for promotional gifts.  The
> majority of my size-1 balls hover around 46-48. This jibes with online
> range suggestions I've seen: but not with the humanoid league specs.
>
> So I think that the specs are probably wrong.  What I want to know is,
> which of these two parts of the humanoid league spec take precedence at the
> competition when it comes to disputing the ball sizes used?
>
>        - "Size 1" -- meaning we could well see at least a 46cm ball
>        - "about 13cm in diameter" -- 40.84cm
>
> To help the small size robots, it'd be helpful to know what size ball we
> should actually be using and what sizes are definitely wrong.
>
> Sean
>
>
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