The Emdrive has been proposed as a propellantless space propulsion.
NASA had investigated and found measurable propulsion.
Now German researchers Emdrive experiments have eliminated other possible sources of error and still measure a small (20 micronewtons) of propulsive force.
There is a lot of discussion of the Emdrive experiment on the NASA space flight forum.
Cavity Length(m) = 0.0686
Big Diameter(m) = 0.0541
Small Diameter(m) = 0.0385
Dielectric = None
Frequency = 2.44Ghz
Input Power = 700w (output of magnetron)
Pressure = 4×10^-6
Q = 20.3 (seems like this was measured and calculated after they finished all reported testing)
Force (milliNewtons) = 0.02 (20 micronewtons)
Martin Tajmar has looked at other possibile alternative space propulsion approaches.
* He looked at using "negative matter" from a theoretical perspective -- theoretical because of the difficulty of producing such a substance, which is not as easy as simple antimatter.
* He has investigated claims of "electrostatic torque," a twisting force meant to occur between charged spheres, and found the supposed anomaly was due to a slight asymmetry in the experimental setup.
* He experimented to look into claims of gravitational shielding with spinning superconductors. This led to a better understanding of sources of error in high-precision gyroscope measurements. These are cases where an apparatus apparently producing small anomalous forces needed to be examined closely.
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Reposted via Next Big Future
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