Unless mankind leaves the Earth, it will surely die there. This blog is dedicated to exploring the manifest destiny of mankind to fill all creation with life and intelligence.
09 July 2011
NASA Ames bought a 1.2 MW, 110 GHz gyrotron for testing beamed energy propulsion
Remarks Keith Henson on the significance of the purchase: "But if you have 9000 m/s exhaust velocity, which can be done with hydrogen heated with microwaves or lasers, then the mass ratio is a little less than 3. So vehicle and payload can be 36% of takeoff mass. If half vehicle and half payload, that's 18% each. So a 300 ton vehicle with a dry mass of 54 tons could put 54 tons in LEO...The falling cost of microwave power and laser power makes these options possible.