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|    Message 44,896 of 45,986    |
|    alien8752@gmail.com to MrAnderson    |
|    Re: Coilgun projectile velocities in spa    |
|    19 Mar 17 21:46:19    |
      From: nuny@bid.nes              On Sunday, March 19, 2017 at 6:26:50 AM UTC-7, MrAnderson wrote:       > This plasma spike seems interesting, I am surprised I didn't see this yet. Do       > I understand it correctly? This plasma torch creates plasma shockwave and       this       > shockwave acts as a shield?               Yep, the plasma is generated with focused microwaves and acts like an       ablative shield as long as it's maintained. The accompanying textsuggests       other possibilities:               "Our experiments have demonstrated that operating an electromagnet inside a       re-entry model causes the shock wave ahead of the model to be pushed away from       the body at a steeper angle. Clearly the magnet influences the flow field. It       is not difficult to        imagine that a magnet three dimensionally gimballed could be used to modify       the flow field in any desired way and to vary the lift and drag upon command."               So a strong magnet in the nose cone of an atmospheric entry vehicle (Rod From       God) only needs a fricking magnet to keep from burning up?               Okay, can *small* hypersonic projectiles carry a neodymium magnet strong       enough to do the job?               How will that affect its mechanical properties upon impact?               Suppose the darts are made of technomagic high temperature superconducting       iridium/holmium/neodymium alloy that is denser than and as strong as tungsten       but can "steal" some energy from the coilgun to magnetize itself as it's being       fired?               Would that negatively impact its usability for ship-to-ship use?               Wait- I read further down:               "A large magnetic field could produce hydromagnetic drag in the cloud of       ionized air the vehicle produces as it enters the atmosphere. With       hydromagnetic braking the kinetic energy of the vehicle would be absorbed       through the magnetic field rather than        through heating of the vehicle itself, with the result that the total weight       required to protect the vehicle from overheating and destruction could be       markedly reduced."               Damn. Can the magnetic field shape, and therefore the shock cone shape be       twiddled to minimize drag? Somehow "sharpen" it instead of having it be blunt?                      Mark L. Fergerson              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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