P3D Re: Floating 3D Revised

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>>Helium, a by-product of natural gas production,
>>has a lifting capacity of 1.02 kg/m3
>>(0.0640 lb/ft3).  [from the Airship FAQ]

>I should have been more specific as to what I'm trying to do. I want to
>build an ultra light stereo hyper camera, say 150 grams, to be floated at a
>distance of between 20-30 meters ( 60-100 feet). We're talking a couple of
>chocolate bars weight here, so hopefully they could be lifted without a
>major investment in balloon power.
>

  Let's suppose that the balloons and threads
to attach them and tether string to the ground
weigh another 50 g. So 200 grams total.

  Thus you need about 1/5 of a cubic meter of
helium. There are 1000 L in a cubic meter so
you need 200 L of helium. If each balloon holds
2 Litres of helium you will need 100 balloons.

  So 10 balloons ain't gonna cut it :(
unless you get some big weather-type balloons.

Greg E.



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