Hi Robin, you write: >Possible, but not exactly in evidence.
Quoting Andre, "In the following we review the the theoretical model for the engine put forth by SPR..." The next paragraph is then supposed to represent Rogers view, despite being phrased in the ( typically academic ) first person plural form. It's not clear though, and on first reading I thought the same. Perhaps someone who knows Andre can write him and request some clarification. Wouldn't it be surprising if he asserts the phase velocity is the speed of energy transfer? >He has however missed one point. Looking at figure 2.4, it's >obvious that upon reflecting from the sloping side, the wave will >not only impart a vertical force to the wall, but also a >horizontal component, since the angle of exit will be equal to the >angle of entry, and hence the overall force on the wall will be >perpendicular to it. Because the wall slopes, this perpendicular >force can be broken up into a vertical component and a horizontal >component. Without doing the math, my intuition says that the sum >of all the horizontal components on the walls will exactly equal >the difference between the forces on the ends. I completely agree, the thought struck me as well. Roger sort of hand waves around this point by saying that due to impedence matching we can discount this effect. By that, I take it to mean that he uses a proper exponential horn rather than the crude linear illustration. But still, I am deeply troubled. It's a show stopper. Another way to descibe the device is to say that he is transforming from a TEM wave to a TE or TM wave, if you are familar with the microwave terms. >That then begs the question, whence the actual force measured in >the real devices? :) Yup. K. BTW, love your new sig. Here's one for you. "Is it just me, or is the 21st century basically the Middle Ages with indoor plumbing?" -K-
