<snip>In blazotron’s analysis of the theory paper, he states: “Then [Shawyer] states, completely without support, that the force imparted by a wave with group velocity vg is 2nhfA*(vg/c). Nowhere in the text is it explained why we should be using the group velocity of the wave to calculate force.” I think blazeotron is somewhat incorrect in stating where in the text is this explained. The author alludes to:CULLEN A.L. ‘Absolute Power Measurements at Microwave Frequencies’ IEE proceedings Vol 99 Part IV 1952as explaining where he gets the above derivation. But this is not an actual explanation, so semantically I guess, blazotron is right!Please post Cullen’s paper on this forum. A simple web search will not provide this paper online.
Quote from: Jim on 04/21/2009 11:23 pmQuote from: GI-Thruster on 04/21/2009 11:19 pmcutting-edge system being flown by ESA.What cutting-edge system? Ion propulsion is not new.Ion is not new. It's had millions in development for more than 4 decades. But as the text says, no normal propulsion system can do what it does. GOCE itself is new. Very new. A good standard to measure against when talking about satellite station-keeping:http://www.esa.int/SPECIALS/GOCE/SEMSZCEH1TF_0.html
Quote from: GI-Thruster on 04/21/2009 11:19 pmcutting-edge system being flown by ESA.What cutting-edge system? Ion propulsion is not new.
cutting-edge system being flown by ESA.