Balloon Lift

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Offline turnipsock

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Balloon Lift
« on: 06/05/2008 22:41:37 »
How many balloons, filled with H or He, would it take to lift a 100kg sofa? Like many of you, I have bought a new sofa on the May bank holiday (where was Martin Kemp this year?). Rather than drive the old one out to some layby somewhere I thought I would take a leaf out of Lawnchair Larry's book and attach the old one to some weather balloons and let it drift off harmlessly into space.

If the balloons are 1m diam and the sofa weighs 100kg, how many would I need?

I think H gives more lift than He, but is more risky.

Beeswax: Natures petrol tank sealant.

When things are in 3D, is it always the same three dimensions?

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Offline Pumblechook

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Balloon Lift
« Reply #1 on: 06/05/2008 23:09:10 »
Lift of 1 gramme per litre of helium seems to be the figure given by many websites.

100kg would need 100,000 litres = 100 cubic metres.  (1 cu m could lift 1kg)

1 metre dia ballon = about 0.5 cubic metre.

So 200 would just about get it off the ground..  You would need more to get up higher.

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Offline turnipsock

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Balloon Lift
« Reply #2 on: 07/05/2008 01:05:28 »
http://www.cbc.ca/world/story/2008/04/23/balloon-journey.html?ref=rss

I've just seen what happened to this poor chap, it's such a shame. You have to wonder if there is really a god.
Beeswax: Natures petrol tank sealant.

When things are in 3D, is it always the same three dimensions?