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*To*: T.L.G.vanderLinden@student.utwente.nl (Timothy van der Linden)*Subject*: Re: New idea Laser launcher/scoop systems*From*: kgstar@most.fw.hac.com (Kelly Starks x7066 MS 10-39)*Date*: Mon, 11 Mar 1996 08:51:28 -0500*Cc*: KellySt@aol.com, kgstar@most.fw.hac.com, stevev@efn.org, jim@bogie2.bio.purdue.edu, zkulpa@zmit1.ippt.gov.pl, hous0042@maroon.tc.umn.edu, rddesign@wolfenet.com, David@InterWorld.com, lparker@destin.gulfnet.com, bmansur@oc.edu

At 8:55 AM 3/11/96, Timothy van der Linden wrote: >Lee wrote, > >>>Although, I don't know what this program or the equation looks like, I've >>>serious doubts if they are right. This is because the numbers don't line up >>>with my own and with Steve's calculations. (2 to 1) >>> >>I checked his equation source and it is the right equation for non >>relativistic flight, I have the version for relativistic flight if you want >>it. Actually his numbers don't look to far off. Because of the extremely >>high specific impulses he listed, the mass ration is very low. > >I already see what makes the difference (besides the fact that formula >doesn't take into account what the energy:mass ratio of the fuel is). For >slightly different exhaust speeds (around 0.08c) the ratios are optimal. I >must have overlooked that in Kellies table, where at the top this speed of >25M is used. I don't understand however why all the other numbers are shown >in the table. I wanted to show all mass ratio's with various specific impulse numbers. >>However, I would like to know where his choices of Specific Impulse I(sp) >>came from they look a little outrageous. > >I can tell you (and show you, but would not recommend) that for a final >velocity of 100,000,000 m/s an exhaust speed of 24,500,000 m/s is optimal >(assuming a mass:energy ratio of 300) The initial:final weight ratio is 70:1 >in that case. (All these numbers are rather critical!) > >Timothy Agreed, unfortunatly the papers weren't that interested in the systems with spec impulse of over 1,400,000. Which is anoying. Kelly ---------------------------------------------------------------------- Kelly Starks Internet: kgstar@most.fw.hac.com Sr. Systems Engineer Magnavox Electronic Systems Company (Magnavox URL: http://www.fw.hac.com/external.html) ----------------------------------------------------------------------

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