If you really had such a method, funding would not be an issue.
Currently, a single launch can cost that much. Objects the size quoted
are currently launched for around $10-$20 M, so investors could see a
huge payoff quickly. The way such companies are started, BTW, is that
you get a team of experienced people, write a business plan, and visit
Venture Capitalists that specialize in aerospace. They will give you
suggestions and contacts (and after a lot of work and visits, money).
One of the first people you will need is a lawyer. The second is an
accountant...

allo allo wrote:
Let's say the regulars around sci.space managed to come up with a
near-perfect space launch system and agree about it being the best.
Let's say
100M US$ to build a system that launches

This cost sounds very low - you may have made some incorrect
assumptions about pricing. This is going to be a red flag - if you can
think of this, why hasn't anyone else? Not saying it is impossible,
just be prepared to show them extraordinary proof of your extraordinary
claim.

1000kg at a time

The market for launches this size is relatively small, say $50M per
year. Most of the money is in GEO launches, about ten times this size.
Since you say your idea scales up, spending $1B to capture the 10 ton
market may make more sense.

at 5g max accel.,

Note that normal people will not use such a method. Fine for
satelites, though.

launching up to 10M kg/yr directly to LEO without a need for a
circularization burn,
at an inherent cost below 6 US$/kg,

Note that the energy cost of current launchers is way down in the
noise. Really, what decreases launch costs is to decrease the risk of
failure. For example, redundancy or continuous safe abort.

a system powered by electricity on the ground, with efficiency above
90%,
low environmental impact,
using continuous power,
and with marginal tourism value.

Unfortunately, the system does not scale down well, so you can't
build
a very convincing test model on the ground.

You are already at the small end, you should really think about scaling
up, not down.


Alright, where would you go from there? How would you go about
getting
it built?

As I have said, form a company, get venture capital. If you want more
details, ask specific questions.

-David