Helium filled tires

no but i have heard somthing about magic lobsters....

Mike

--
swarbrim
------------------------------------------------------------------------
swarbrim's Profile: http://www.unicyclist.com/profile/11005
View this thread: http://www.unicyclist.com/thread/45550

If you are suggesting that the helium makes the unicycle lighter, I
seriously doubt the tire would hold enough helium to make any
significant difference in weight.

Nothing scientific here, just my opinion. Consider this. A toy balloon
would probably hold about the same volume of helium as a unicycle tire
and that just barely holds up the toy balloon.

--
Wheel Rider

A man can fail many times but he isn't a failure until he begins to
blame someone else. - Waite Phillips
------------------------------------------------------------------------
Wheel Rider's Profile: http://www.unicyclist.com/profile/10656
View this thread: http://www.unicyclist.com/thread/45550

:eek: EEK:eek:

--
musketman
------------------------------------------------------------------------
musketman's Profile: http://www.unicyclist.com/profile/9214
View this thread: http://www.unicyclist.com/thread/45550

yes but ive heard that the tire getty squishier and more bouncy than
normal air.

--
musketman
------------------------------------------------------------------------
musketman's Profile: http://www.unicyclist.com/profile/9214
View this thread: http://www.unicyclist.com/thread/45550

Helium is a waste of time and stuff. The helium will not stay in the
tube for very long, and when the helium really is in the tube it will
make as much diference as if you cleaned your uni from dust before you
went out for a ride.

But I see much potential in the magic lobsters...

--
fexnix

'*My fresh gallery*'
(http://gallery.unicyclist.com/Fexnix-album)
*I Got Infinite Skillz*
------------------------------------------------------------------------
fexnix's Profile: http://www.unicyclist.com/profile/7381
View this thread: http://www.unicyclist.com/thread/45550

There have been many threads on this, i'm not sure about the dust but
certainly scrapping the paint of your frame would save more weight.
Using nitrogen would mean that the tyre pressure was affected less by
temperature (that's why it's used in Formula 1) but because of the
change in the properties of the rubber the tyre pressure would need to
be changed anyway, so no help there. As fexnix suggested, air tight
does not mean sealed for all gases, helium is the second smallest
molecule gas, it's pretty hard to keep it in one place for very long.

I can't eat lobsteres, magic or otherwise.

--
kington99

Dave

- what a thoroughly post-modern subversion of the cycling genre -
------------------------------------------------------------------------
kington99's Profile: http://www.unicyclist.com/profile/9417
View this thread: http://www.unicyclist.com/thread/45550

kington99 said:

...
...
I can't eat lobsteres, magic or otherwise.

You don´t eat them silly...

--
fexnix

'*My fresh gallery*'
(http://gallery.unicyclist.com/Fexnix-album)
*I Got Infinite Skillz*
------------------------------------------------------------------------
fexnix's Profile: http://www.unicyclist.com/profile/7381
View this thread: http://www.unicyclist.com/thread/45550

screw helium.. go hydrogen!... actually... i dont think you could find a
difference... you might be able to make the hydrogen blow up... but
that would take a ton of skill to get a spark inside your tube...

--
THE dave

Toast
dave

psychoteledave2(at)hotmail(dot)com
Team Yams

- last edited by james_potter on 2005-10-5 at 3:58pm

last edited by unitik908 on 2005-09-06 at 04:12 am

last edited by forrestunifreak on 2005-09-09 at 03:51 am-
------------------------------------------------------------------------
THE dave's Profile: http://www.unicyclist.com/profile/9259
View this thread: http://www.unicyclist.com/thread/45550

Not really just run some electirc wires inside the tube. The run a
current through it. KBAM... Runs outside to try....

--
Ingo van Thiel

I am nothing, and nothing is perfect, Therfore I am perfect.

Obey gravity. Its the law!

"Whatever camo the French are using in Iraq kicks ass! You can't even
see those guys!"
------------------------------------------------------------------------
Ingo van Thiel's Profile: http://www.unicyclist.com/profile/9205
View this thread: http://www.unicyclist.com/thread/45550

i saw on tv one time it took 75 helium balloons to lift up a chiuaua.

--
unist

HAHA
------------------------------------------------------------------------
unist's Profile: http://www.unicyclist.com/profile/10351
View this thread: http://www.unicyclist.com/thread/45550

Nitrogen less temperature-sensitive? Doesn't it follow the law of Boyle
- Gay Lussac then?

Hydrogen in your tyre does not explode when a spark is ignited in it.
Only if you mix it with oxygen, which would negate the weight issue.

There have been lots of threads about helium in the tyre. The physical
effect is very small. As always, the Google search facility is more
powerful than this site's search to find them. I've done the (little)
work for you:

http://tinyurl.com/cd4p7

--
Klaas Bil
------------------------------------------------------------------------
Klaas Bil's Profile: http://www.unicyclist.com/profile/3442
View this thread: http://www.unicyclist.com/thread/45550

THE dave said:

screw helium.. go hydrogen!

"The unicycle's burst into flame! ...And....it's crashing. It's a
tremendous fireball. Oh, this is the worst thing in the world. Oh the
humanity!"

🙂

Speaking of lifting stuff with balloons:
We saw the new Cirque du Soleil show, Corteo, the other night.
Excellent show; one of the best Cirque shows I've seen! In one part of
the show, a performer comes out in a harness, attached to a bunch of
weather-sized balloons. At least eight of them. Her harness allows her
to spin around in various directions. After a while, it becomes
apparent that her rigging must be pretty sophisticated. Then, the guy
tossing her up and down tosses her out over the audience. Members of
the audience have to push her back up into the air! At this point it's
obvious there is no rigging attaching her balloons to anything else.
She's really floating, made almost neutrally bouyant by those
balloons!

But it's a lot of balloons, and she's a very small person, maybe 3'
tall.

Still, I'd love to play with a setup like that...

--
johnfoss

John Foss
"jfoss" at "unicycling.com" -- www.unicycling.com
-----------------------------------------------

"Idiot America—where fact is merely that which enough people believe,
and truth is measured only by how fervently they believe it." --
Charles Pierce, in Esquire Magazine
------------------------------------------------------------------------
johnfoss's Profile: http://www.unicyclist.com/profile/832
View this thread: http://www.unicyclist.com/thread/45550

Klaas Bil said:

Nitrogen less temperature-sensitive? Doesn't it follow the law of Boyle
- Gay Lussac then?

Not necessarily, they only apply if the gas is of sufficiently low
density to say there is no particle interaction (i.e. an Ideal gas)
I'm not sure if pv=nRT can be applied in this situation for that
reason, the compressibilty factor Z needs to be taken in to account in
the calculation. Now i can't remeber if Z depends on the gas being used
or not, but i think it does because it's to do with, amongst other
things, the size of the molecules and the inter-molecular forces, which
are different for each element. To be honest i'm not entirely sure what
the answer is, although i am sure we can work it out between us.

--
kington99

Dave

- what a thoroughly post-modern subversion of the cycling genre -
------------------------------------------------------------------------
kington99's Profile: http://www.unicyclist.com/profile/9417
View this thread: http://www.unicyclist.com/thread/45550

swarbrim said:

no but i have heard somthing about magic lobsters....

Mike

Yes, Kris Holm has a throng of magic lobsters and wires at his
disposal.

--
DK

*sunday bombs
we're up in arms
dinner's done
apple pie has won*
------------------------------------------------------------------------
DK's Profile: http://www.unicyclist.com/profile/8054
View this thread: http://www.unicyclist.com/thread/45550

this issue is sort of a joke amongst unicyclists.
It, i believe, came up in a thread about weight of a unicycle.

--
abbabibble

Cheers, Mat.
-----------------------
SUPER AWEXOME SUPER-UNI SHIRTS! PREORDER YOURS
TODAY!!!http://unicyclist.com/forums/showthread.php?t=44230
--"to maxis: STOP. GRAMMAR TIME." -Fwgen0moB?
"abababilbel" - General Dibbles
------------------------------------------------------------------------
abbabibble's Profile: http://www.unicyclist.com/profile/10751
View this thread: http://www.unicyclist.com/thread/45550

Z is indeed different for different gases but that's not the point
because it has to do with the P versus V relationship, not su much P
versus T. Through some Googling I have found that the main reason that
some tyres (e.g. Formula One) are filled with nitrogen is that they run
cooler than with air. Therefore, the pressure increase due to riding is
also smaller, which is what might have caused your earlier statement. I
haven't been able to find out why nitrogen-filled tyres run cooler. The
viscosity of N2 is only marginally lower than that of air.

--
Klaas Bil
------------------------------------------------------------------------
Klaas Bil's Profile: http://www.unicyclist.com/profile/3442
View this thread: http://www.unicyclist.com/thread/45550

johnfoss said:

"The unicycle's burst into flame! ...And....it's crashing. It's a
tremendous fireball. Oh, this is the worst thing in the world. Oh the
humanity!"

🙂

Teetering on the brink of bad taste, but falling just the right side!
I see the giant envelope of the Coker tyre with flames rippling across
its surface, and people scattering. I will never proof my inner tube
with rocket fuel again.

As for the helium in the tyre thing. It would make a difference, but
retaining the helium would be a serious problem. My step father told
me a tale of a friend who wanted to make a model hydrogen balloon. He
set up the chemical reacction (what is it? Limestone in hydrochloric
acid?) and a system of tubes to direct the hydrogen into the er...
polythene envelope. Went out for a couple of hours, came back in, saw
that the envelope was still disappointingly flat and was only just
stopped from turning the light on to have a closer look.:eek:

The weight of the uni is more important than the weight of the rider,
and the weight of the wheel (especially the tyre/tube/rim) is more
important than the weight of the frame or seat. However, I suggest
anyone really wanting to make significant savings would be better
advised to drill the rim - or buy a Sheldon Brown monospoke hubset.

--
Mikefule

What you have can be taken away but what you have had cannot.
------------------------------------------------------------------------
Mikefule's Profile: http://www.unicyclist.com/profile/879
View this thread: http://www.unicyclist.com/thread/45550

DK said:

Yes, Kris Holm has a throng of magic lobsters and wires at his disposal.

I first thought you said thong, realy bad mental image

--
X51
------------------------------------------------------------------------
X51's Profile: http://www.unicyclist.com/profile/10707
View this thread: http://www.unicyclist.com/thread/45550

Hey! You've lost half your molecules!

--
Brian MacKenzie

'Training Wheel Not Required DVD'
(http://www.LBMmultimedia.com/videos/TWNR.wmv)
------------------------------------------------------------------------
Brian MacKenzie's Profile: http://www.unicyclist.com/profile/7650
View this thread: http://www.unicyclist.com/thread/45550