PhilKravitz
Why is there no low cost space launch technology? The cost to buy the energy (in the form of electricity) required is very low (don't have the number on me).
If one buy the joules per kilogram required to reach orbit from the electric company in the form of electricity it is well let seeHow do you define "low cost" and what does electricity have to do with it? The problem of launching an object into orbit is pretty straightforward and to do better than chemical rockets would require something pretty exotic.
There is a lot more than just energy required to launch a rocket. The force required to accelerate a rocket is based on momentum transfer from the rocket to the exhaust gases. Momentum transfer requires mass (photons are the exception*). Because mass is transferred to the exhaust from the rocket, the rocket loses mass, so the rocket has to carry this mass in addition to the energy needed to accelerate the expelled mass. Also, the acceleration rate has to be limited to a few g's (10?) in order not to crush the astronauts inside. See the rocket equations inIf one buy the joules per kilogram required to reach orbit from the electric company in the form of electricity it is well let see
1 kilo to say 1e4 m/sec using 1/2*m*v^2 is 5E7 joules
so 1 kilowatt hour at 20 cents from con edison is 3.6e6 joules for 20 cents. So 5E7 joules would cost about $3. Of course there are always losses in any system but even with only 10% eff. that would be $30 per kilo to orbit as far as energy costs are concerned. But rockets cost roughly $10,000 per kilo.
I do like the beamed power solutions I have been seeing articles about recently. Beam power to the "rocket" in the form of microwaves or as laser light.
Kinetic energy may be written (Newtoninan classical mechanics)I do like the beamed power solutions I have been seeing articles about recently. Beam power to the "rocket" in the form of microwaves or as laser light.