Re: 2007 NASA Beam Power Challenge, $1M prize (fwd)

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---------- Forwarded message ----------
Date: Fri, 18 May 2007 10:47:34 -0700
From: Ed Phillips <evp@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 2007 NASA Beam Power Challenge, $1M prize (fwd)

Note that the article just talks about the 2005 and 2006 challenges.

http://www.elevator2010.org/ has the latest rules, etc.

The purse is $500K for the beam power aspect.
Payload must be 10-25 kg
climb 50m at a speed no less than 2m/sec
(that's 25 seconds)

mgh = 10*9.8*50 = about 5000 Joules
25 seconds means Pavg of 200W

Just to ballpark something simple like solar cells.. assume you get 
25% overall efficiency from light to motor.  You'll need about a 
square meter of solar cells."

	To me solar cells don't fit the category of "wireless power" referred to here.  The 25% overall efficiency from light to motor (should be to effective thrust of lift/propulsion system) seems mighty might optimistic...............

Ed