Toulouse2010paper01.doc

Toulouse2010paper01.doc - THE EMDRIVE A NEW SATELLITE...

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THE EMDRIVE – A NEW SATELLITE PROPULSION TECHNOLOGY Roger Shawyer C.Eng. MIET. FRAeS SPR Ltd, United Kingdom Biography Roger Shawyer is a Director of Satellite Propulsion Research Ltd (SPR). Early career experience in the Defence Industry, included R&D work on guided missiles, radars, and communication systems. This was followed by 20 years in the Space industry at EADS Astrium, which included appointments as Head of Department for payload equipment, and as Project Manager for a number of large communications payloads. Responsibilities also covered the initial design of the Galileo navigation payload and signal structure. SPR was set up in 2001, and has carried out a continuous R&D programme in EmDrive technology using UK government funding, private investment and industry contracts. 1. INTRODUCTION EmDrive technology provides direct conversion of electrical energy to thrust, using radiation pressure at microwave frequencies in a tapered, high Q, resonant cavity. For the first time, propulsion without the need for expelling reaction mass has been demonstrated. As the theory and experimental work clearly shows however, EmDrive is not a reactionless machine. It obeys Newtonian physics by producing an accelerating, reaction force opposite to the thrust vector. The law of conservation of energy is also obeyed, as is well illustrated by applying the dynamic thrust equation to a very high Q, superconducting thruster. The paper gives a summary of the theory behind EmDrive, followed by answers to the most frequently asked questions concerning the production of net force, conservation of momentum and conservation of energy. The theory clearly derives equations for both static and dynamic thrust. Under the SPR programme, non linear cavity design software has been developed. This was verified during the manufacture and test of four different thrusters. The test programmes have consistently and repeatedly given thrust and acceleration measurements in close agreement with theoretical predictions. Great emphasis has been placed on eliminating or calibrating out any spurious force data during the tests, and technical reports have been independently reviewed by government and industry experts. EmDrive technology is now under development in China and the USA. The North Western Polytechnical University in Xian took the basic theory from the SPR website, and developed their own theoretical model. Based on this, they have manufactured and successfully tested an S Band Thruster. The work was then reproduced at a government research institute in Beijing. Development work is now continuing on a 3kW Thruster. The technology has also been transferred to the USA, under a Technology Assistance Agreement (TAA) sanctioned by the US State Department, and an export licence granted by the UK government. EmDrive has also been studied by DARPA and has been the subject of R&D solicitations to the US space industry.
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