Date: Tue, 7 Feb 2012 22:59:09 +

Author: Urs Lauterburg

Subject: Re: Bicycle Wheel

Post:

Clarence,

Well I never heard of our tractor wheels being filled with water. I
guess I have to check with a farmer to confirm. At the average I think
our tractors are sure smaller than yours, in fact they scale with the
size of the country;-). They usually have two large diameter wheels in
the back and two small ones up front to steer with, like usually most
of the tractors do.

As for the bicycle wheel we use as a gyroscope I actually took the
tire off and bent a rather massive rectangular profile brass stick
within the rim all around the circumference. That gives it a nice
mass, thus a large moment of inertia. I would accelerate the wheel
with a heavy duty electric motor to hang the spinning wheel at the
outside of its handle onto a string which is attached suspending from
the ceiling. The wheel would stay there asymmetrically suspended and
perform its magic precession. Isn't nature great!

Regards and happy cycling in any conceivable ways

Urs

Urs Lauterburg
Physics demonstrator
Physikalisches Institut
University of Bern
Switzerland


Am 07.02.2012 um 17:11 schrieb Bennett:

> "I've got an old tractor and the back wheels are filled with water.
> Googling "tractor wheels, water filled" brings up lots of hits.
>
> George H.
>
>
> When I was riding around Helvetica on a Choir tour bus thirty two
> years ago,
> I noticed that the farm tractors were wide and low with small wheels.
> I assume that was because the fields were on mountain sides instead of
> flatlands.
>
> Urs, Do I remember correctly?
>
>
> Do you remove all the air from the tubes with water?
>
>
>
>
> On 2/7/12, Bill Norwood wrote:
>> I remember working with various tractors on the farms when in my
>> teens, and
>> I remember puzzling why the Allis Chalmers models had smaller rear
>> wheels -
>> there was actually (I guess) a gear drive between the rear axle and
>> each
>> rear wheel axle. But physics seems to reveal that such a
>> configuration would
>> lower the center of mass of the tractor, especially if it had water-
>> filled
>> wheels, and would attenuate somewhat the rollover problem.
>>
>> -----Original Message-----
>> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-
>> owner@lists.ncsu.edu] On
>> Behalf Of George Herold
>> Sent: Tuesday, February 07, 2012 8:59 AM
>> To: tap-l@lists.ncsu.edu
>> Subject: Re: [tap-l] Bicycle Wheel
>>
>> I've got an old tractor and the back wheels are filled with water.
>> Googling "tractor wheels, water filled" brings up lots of hits.
>>
>> George H.
>>
>>> -----Original Message-----
>>> From: tap-l-owner@lists.ncsu.edu
>>> [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of
>>> trappe@physics.utexas.edu
>>> Sent: Tuesday, February 07, 2012 8:17 AM
>>> To: tap-l@lists.ncsu.edu
>>> Subject: Re: [tap-l] Bicycle Wheel
>>>
>>> Anybody have experience actually doing this? I suspect you have to
>>> rig a water hose attachment with a Schroeder valve plunger to get
>>> the
>>> water in and not have it leak right back out. Just "pouring" it in
>>> will NOT work. Karl
>>>
>>> Quoting "Miglus, Vacek" :
>>>
>>>> On 2/6/12 3:53 PM, "David Sturm"
>>>> wrote:
>>>>
>>>>> I've heard of people filling inner tubes with water. That
>>> would seem
>>>>> to make it very weighty.
>>>>
>>>> But the cool thing is that you can spin it up, stop it against the
>>>> floor and when you pick it up it will start turning again. All that
>>>> water is hard to stop.
>>>> --
>>>> Vacek
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
> --
> Clarence Bennett
> Oakland University
> Dept. of Physics, (retired)
> 111 Hannah
> Rochester MI 48309
> 248 370 3418



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