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JP Aerospace and rotating sun toy
I note that the first airship pictured at:
http://www.hobbyspace.com/AAdmin/arc...alAirship.html it looks like a dark blue in the front part of the V and then silver in the 2 back parts. On my shelf next to my desk I have one of these toys that spins in sunlight. Probably most people are familiar with it, there are 4 little plates that are black on one side and white on the other that spin in a glass bulb with a partial vacuum. So I wondered if this is related to the JP Aerospace propulsion system. My toy moves away from the black side. Basically molecules bounce away faster from the hotter black side and so push on it more. But this would push the airship backwards as it is colored now. So this does not seem to be it, unless the builder got things backwards. Still, this force seems like it could be some fun for airships at high altitudes. Imagine a single cylinder shaped airship that is black in the back half and white in the front half, with something inside separating the two halves. Imagine that it is moving perpendicular to the sun and rolling like a rotisserie to even out the heat. So the back half that is black would be hotter and would have a net thrust. Anyone know how to calculate this thrust? -- Vince |
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