On Thu, Jul 23, 2015 at 11:30 PM, Dave <deltadave@usa.net> wrote:
I think the real problems in getting this to work are base station power,  targeting the beam accurately enough in later stages of launch and keeping the heat exchanger from point burn through in the case of uneven fuel flow.

All problems of engineering scaled-up usage, not problems with the basic process.
 
I also see shooting a beam of microwaves through a cloud of superheated steam . . .

Superheated hydrogen gas. In other words, a very thin plasma.

[NOTE: I'm not an engineer or a scientist. I've just listened a lot to the ones on this list who are.]


--
Richard Aiken

"Never insult anyone by accident."  Robert A. Heinlein
"A word to the wise ain't necessary -- it's the stupid ones that need the advice." - Bill Cosby
"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester