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**echocassidyde** · 10-17-2009, 04:57 PM

If so, I'm curious about the probability / possibility that it was viable.

I'm surprised someone didn't work this out and call it in:

The craft was described as 20 ft across and 5 feet high. Its shape is an oblate spheroid (an ellipsoid with 2 radii equal). The formula for volume is:

V = 4/3 x pi x A x B x C

V = 4/3 x 3.1416 x 10 x 10 x 2.5

V = 1047.2 cubic feet.

Lifting power of helium is .067 lbs per cubic foot. Total lifting power of the craft is 70 lbs. Average weight of a 6 year old boy is 45-50 lbs.

That leaves 25 lbs. The weight of the balloon material and the gondola is...what?

10-17-2009, 04:57 PM	#1
echocassidyde Join Date Oct 2005 Posts 407 Senior Member	If so, I'm curious about the probability / possibility that it was viable. I'm surprised someone didn't work this out and call it in: The craft was described as 20 ft across and 5 feet high. Its shape is an oblate spheroid (an ellipsoid with 2 radii equal). The formula for volume is: V = 4/3 x pi x A x B x C V = 4/3 x 3.1416 x 10 x 10 x 2.5 V = 1047.2 cubic feet. Lifting power of helium is .067 lbs per cubic foot. Total lifting power of the craft is 70 lbs. Average weight of a 6 year old boy is 45-50 lbs. That leaves 25 lbs. The weight of the balloon material and the gondola is...what?
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