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Old 10 December 2016, 03:13   #1
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childish question. Why not inflate tubes helium gas

One of my twins (14-een) asked me this question after he learnt in School about this gas ...

Had not idea what to answer except cost

But if performance and fuel consumption is related to weight why not ...
Or it is not safe plus not good for tubes ?

Sorry for childish question but I have snow around and plenty time for stupid questions.

>>>>>>>>>>>>>>>>>>>>>>>

OK, boys calculated force using formula:

F = g * V * (density_air - density_helium)
density_air = 1,29 kg/m3
density_helium = 0,18 kg/m3
g = 9,8 N/kg
V = pi*r2 * 12 meters (lenght of tubes, r is 0,27)

So the force is ONLY 2,5 N
I do not expect to fly like on "UP" movie.
But is it only so small difference in weight ?
If yes - there is not reason to use expensive helium
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Old 10 December 2016, 03:50   #2
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Hi,

I think you'll find that you would need another tube material other than Hypalon as the helium will leak out. and as I guess you've discovered the weight saving would be miniscule.

Steve
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Old 10 December 2016, 16:58   #3
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Small molecules so take an awful lot of keeping in!
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Old 11 December 2016, 07:20   #4
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Helium is also hideously expensive, it's also a finite resource, when it's gone, it's gone. We shouldn't be wasting it on balloons & toys.
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Old 11 December 2016, 07:32   #5
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Quote:
Originally Posted by Pikey Dave View Post
Helium is also hideously expensive, it's also a finite resource, when it's gone, it's gone. We shouldn't be wasting it on balloons & toys.
...You been on the Nitrus Oxide again!??
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Old 11 December 2016, 07:40   #6
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Quote:
Originally Posted by Maximus View Post
...You been on the Nitrus Oxide again!??


That made I larf
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