From: james brown <jim2mars@sbcglobal. net>
Subject: Re: [NEAmines] Heat Differentials and more
To: NEAmines@yahoogroup s.com
Date: Tuesday, June 30, 2009, 12:29 PM

Most ion drives do not spend much power on heating, Just enough to ionize it, but mostly it uses extrema charges to accelerate the gas. The MET uses electricity to supper heat a gas way beyond what can be done chemically, but it keeps it just below ionizing.

A Kg = 2.2 pounds. Your Moon water cost do not make sense, $50,000/# would work out to $110,000/Kg not 23,000/Kg.

Jim Brown

---

From: EOS Mars Program <eos.mars.program@ btinternet. com>
To: NEAmines@yahoogroup s.com
Sent: Monday, June 29, 2009 1:04:41 PM
Subject: Re: [NEAmines] Heat Differentials and more

Ueli, Jim,

That's OK then! Was just looking for a suitable backup system.

By the way, I am uncovering more and more electrothermal- powered
missions, the latest being NASA's Lunar Reconnaissance Orbiter.

http://www.nasa. gov/mission_ pages/LRO/ main/index. html

http://lro.gsfc. nasa.gov/

http://lcross. arc.nasa. gov/resources/ LaunchPreview. ppt

http://www.nasa. gov/pdf/360020ma in_LRO_LCROSS_ presskit2. pdf

From the press-kit, I garner these stats for the Orbiter itself
(excluding primary launch vehicle's fuel and mass etc):

Solar Array Area: 13.68 sq/m

Solar Array Output: 685 watts

Watts/Square Meter = 50

Orbiter Mass: 1018 kg

Fuel Mass: 898 Kg

Mass Ratio: Fuel/Orbiter = 1:1.3

NASA's figures for the cost of water transported to the Moon $50,000/
pound (about $23,000/Kg), clearly another market here.

NASA seem very cagey about the precise details of the ion-drives.
This mission was also launched on Russian-made rocket motors.

Jan

On 29 Jun 2009, at 16:37, Ueli Scheuermeier wrote:

> Jan, as far as I understand you've just reinvented the "solar
> dynamic" electricity source.
>
> Ueli
>
> --- On Mon, 6/29/09, EOS Mars
> Program<eos.mars.program@ btinternet. com> wrote:
>
> From: EOS Mars Program <eos.mars.program@ btinternet. com>
> Subject: [NEAmines] Heat Differentials
> To: NEAmines@yahoogroup s.com
> Date: Monday, June 29, 2009, 3:28 PM
>
> A thought about how one could use the temperature differential
> between sunside and nightside on a spacecraft.
>
> If an external sunside heat collector contained a volatile liquid
> that could be superheated to pass into a turbine generator in the
> bowels of the craft, and the output cooled by radiators on the
> nightside, power could still be generated if the solar panels had to
> be furled during a solar flare episode.
>
> Or am I missing something here?
>
> Jan