A New Concept in Spacecraft Propulsion
Satellite Propulsion Research Ltd (SPR Ltd) a small UK based company, has demonstrated a remarkable new space propulsion technology. The company has successfully tested both an experimental thruster and a demonstrator engine which use patented microwave technology to convert electrical energy directly into thrust. No propellant is used in the conversion process. Thrust is produced by the
amplification of the radiation pressure of an electromagnetic wave propagated through a resonant waveguide assembly.
A number of research groups have asked questions on the methods of measuring EmDrive forces. A note explaining the principles can be found here: EmDrive Force Measurement
At the IAC 2014 conference in Toronto, Roger Shawyer stated that 8 sets of test data have now verified EmDrive theory. These data sets resulted from thrust measurements on 7 different thrusters, by 4 independent organisations, in 3 different countries.
The Toronto presentation can be found here: IAC14 Presentation
A recent interview with Roger Shawyer, recorded by Nick Breeze at the Royal Institution in London can be found here: Interview
It is accompanied by a PowerPoint presentation entitled “EmDrive-Enabling a Better Future”.
A paper entitled "Second Generation EmDrive Propulsion Applied to SSTO Launcher and Interstellar Probe" will be presented at the 65th International Astronautical Congress 2014 at Toronto in September.
A paper entitled "The Dynamic Operation of a High Q EmDrive Microwave Thruster" and the associated poster for the recent IAC13 conference in Beijing is given here: IAC13 Paper IAC13 Poster
China publishes high power test results
The prestigious Chinese Academy of Sciences has published a paper by Professor Yang Juan confirming their high power test results. At an input power of 2.5kW, their 2.45GHz EmDrive thruster provides 720mN of thrust. The results have clearly been subject to extensive peer review following the NWPU 2010 paper. The measurements were made on a national standard, thrust measurement device, used for Ion Engine development. Details of the measurement system and calibration data are given in the paper. A professional English translation is given here: Yang Juan 2012 paper
A solution to the acceleration limitation of superconducting EmDrive engines has been found. The application of this breakthrough has been described at a recent presentation, where a hybrid spaceplane provides a dramatic reduction in launch cost to geostationary orbit. A reduction factor of 130 compared to Atlas V launch costs is predicted. This will lead to Solar Power Satellites becoming a low cost, baseload, energy source. The presentation can be downloaded here: 2G update
An English translation of the 2010 Chinese paper, together with unpublished test results have been obtained. The last line of the paper confirms that experimental thrust measurements have been made at 1kW input power. The unpublished test results show a large number of thrust measurements at input powers up to 2.5kW. The mean specific thrust obtained is close to that measured in the SPR flight thruster tests.
Note that the Chinese thruster, if deployed on the ISS, would easily provide the necessary delta V to compensate for orbital decay, thus eliminating the need for the reboost/refueling missions.
The original 2010 paper, the translation and the unpublished test results are given here:
NWPU 2010 paper
NWPU 2010 paper (English translation)
NWPU 2010 unpublished test results
Two papers have been identified, published by Professor Yang Juan of The North Western Polytechnical University, Xi'an, China.
These papers provide an independent proof of the theory of EmDrive. Abstracts of these papers are given in Chinese Paper Abstracts. The originals are written in Chinese.
A Technology Transfer contract with a major US aerospace company was successfully completed. This 10 month contract was carried out under a UK Export Licence and a TAA issued by the US State Department. Details are subject to ITAR regulations.
A paper was presented at the 2nd Conference on Disruptive Technology in Space Activities. See: Toulouse 2010 Paper
Earlier papers presented in a series of international conferences were:
Brighton 2005 paper
IAC 2008 paper
CEAS 2009 paper
The Flight Thruster test programme was successfully completed. See: Flight Programme