John O. wrote:

I'm speaking a little outside my field of expertise
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Oh don't worry about that. My professional field is IT. I'm just a space technology enthusiast that never got past algebra in high school. I recognize the difference between thrust and ISP and understand the different ideas behind forms of rocket proplusion, but I couldn't tell ya actual physics in mathematical form.
Thanks for the info though! It's interesting and an idea I hadn't heard of. Is there a good website for source information?
Do you post on
www.nasaspaceflight.com at all? I lurk over there to keep up to date on the space industry.