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

[Daniel Seifert]

Hi all,

thank you, Mingguo. Since the pictures seem to not have made it past
the mailing list, I've uploaded them to
https://www.robocuphumanoid.org/2015/06/soccer-balls-for-robocup-2015

If you could send the diameter or circumference of the size 1 ball,
once delivered, this would be appreciated.

Daniel

On Wed, Jun 10, 2015 at 3:00 PM, 赵明国 <mgzhao at mail.tsinghua.edu.cn> wrote:
> Hi all,
>
>
> The sample picture of the 1# and 5# ball are as follows. (1# ball is with the Nike and 5# ball is with Adidas)
>
> Best,
> Mingguo
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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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>>>
>>>
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-- 
dseifert at fumanoids.de
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Freie Universität Berlin
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