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Journal: linux powered weather ballon

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The N prize caused me to look this up

A dense paper about launch regulations:

some more

the real thing:;sid=411c0579c5834b8dfae3aee3e75392dd;rgn=div5;view=text;node=14%3A4.;idno=14;cc=ecfr

seems like the rocket has to be guided to allow a predictable orbit, thats tough.

some mass ratio calculations assuming 1-4km/s exhaust velocity and 7km/s orbital velocity.

? exp(7/4)
%8 = 5.754602676005730436866499705
? exp(7/1)
%12 = 1096.633158428458599263720238

Sweet they only put actual vehicle costs on the budget not the more costly licensing and other bureaucratic issues. Somewhere I found mention that launchers actually don't make such a large portion of the launch costs but all the other stuff like range operations.

Exhaust speed obviously matters. Here is a nice table for engines

High exhaust speed requires difficult to handle fuel, consider staging. Staging might need even more control systems and structure and drive up the price+weight.

High altitude thrusters seem to be simpler.

Here is a starter book for liquid engines.

Liquid oxygen might require insulation, more weight added.

More engines:

a practical one:

giving 0.8 km/s ve.

You will start at zero g what will do that to the fuel?

Enough for today. Zzzzzzzzz...

Another day has begun.

The Nprize group had this to say about SpaceX - snide bastards:

The Introduction states: There must be no recontact between the separating bodies, no ...
38 years is a lot of time to forget something.

The idea with the cannon as last stage should be silly since most explosives don't store much energy

also the acceleration is nasty.

panic: kernel trap (ignored)