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Science Forum Index » Economy Forum » What about them whirly thingies that twirl when light...
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| Major Debacle... |
 Posted: Thu Jun 19, 2008 6:21 pm |
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Can they be scaled up?
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Math is your friend |
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| Galen Hekhuis... |
| Posted: Thu Jun 19, 2008 6:30 pm |
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| Whata Fool... |
| Posted: Thu Jun 19, 2008 8:58 pm |
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Major Debacle <Major_Debacle at (no spam) the_Pentagon.mil> wrote:
Quote: Can they be scaled up?
No, sorry to say, but I sure tried.
The toy type work on a different principle than radiation
pressure (the kinetic energy of photons).
There is a lot of interest in solar sails, etc. but little
success so far, even though light pressure affects satellites.
The toy type "radiometers" work because there is a gas in
the bulb that is heated by the black sides of the vanes just long
enough to cause a little push.
And you can check it easily, because if they were true
radiometers, they would turn the opposite direction, a mirror
would provide double the light pressure of a black surface,
reflection is double absorption. |
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| Major Debacle... |
| Posted: Fri Jun 20, 2008 7:46 pm |
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Les Cargill wrote:
Quote: Major Debacle wrote:
Ouroboros_Rex wrote:
Galen Hekhuis wrote:
On Thu, 19 Jun 2008 16:21:31 -0700, Major Debacle
Major_Debacle at (no spam) the_Pentagon.mil> wrote:
This?
http://en.wikipedia.org/wiki/Crookes_radiometer
Can they be scaled up?
In short, no.
You betcha they can. With the money we blew on the Iraq war, we
could have bootstrapped a fleet of these that would pay for future
expansion:
http://en.wikipedia.org/wiki/Solar_power_satellite
What happens if the targeting mechanism goes awry and New York City gets
microwaved?
Rents in NYC probably go down for a few weeks.
:)
--
Les Cargill
LOL!! omigod! LOL!!!
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