Scott Story said:
the fuel requirements would absolutely make the thing a dud, due to the rising fuel storage requirements vs. propulsion issue, and cost.
unless the propulsion system is unlike those you are used to comprehending.
http://en.wikipedia.org/wiki/Beam-powered_propulsion
ie microwaves beamed from another source perhaps higher in orbit.
some of these new power sats being proposed do just that able to beam down enough power to run entire cities
then there is the supposed zero point energy sources.
size ? well thats a human thing too
The Navy likes to call the big Nimitz class carriers "4.5 acres of sovereign and mobile American territory" --
but big as these ships are ,they only useful where there is water.........
imagine taking the same concept "one step up" into the air.
if they are able to react to threats with superior speed and altitude of known aircraft then they are safe from attack.
from a military pov the bigger the better has always been a maxim
A microwave beam could be used to send power to a rectenna, for microwave electric propulsion. Microwave broadcast power has been practically demonstrated several times (e.g. Goldstone, California in 1974), rectennas are potentially lightweight and can handle high power at high conversion efficiency.
However, rectennas tend to need to be very large for a significant amount of power to be captured.
this could explain the size