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Coriolis: The Third Horizon
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<blockquote data-quote="aramis erak" data-source="post: 8709825" data-attributes="member: 6779310"><p>(for simplicity, rounding C=300,000km/s, G=10m/s² - the traveller standards - and I know they're both rounded up.)</p><p>At 1000 km, a laser's travel time is roughly 1/300 second</p><p>the ISS, at 7.66 km/s is a good target. </p><p>So, for a laser, you have to aim 2/300 ahead of where it is.</p><p>If the accelerator manages even 0.1%C... 300 km/s you're having to aim for it's location 3.00033 seconds from where you see it. In that time, ISS, can change vector by only a few m/s... not enough to dodge... unless you're side on.</p><p>but a 100m long ship, some 10m wide, with 1G of thrust can be about D=A×T²/2 so 10×3²/2 is up to 45m off coasting.</p><p>Now, slow those projectiles down to a more reasonable 10km/s (Phalanx is 1.1km/s in atmo...)and that 1000 km is now 100.3 seconds so D=10×100,600.09/2=50,300.45m...</p><p>you're having to saturate an area the size of a mid-sized city to hit with that railgun..</p><p></p><p>It's not the detection range that's the issue, its that they can detect your point of aim soon enough to GTF out of the projectiles' way.</p><p></p><p>Edit: minor formatting issues</p></blockquote><p></p>
[QUOTE="aramis erak, post: 8709825, member: 6779310"] (for simplicity, rounding C=300,000km/s, G=10m/s² - the traveller standards - and I know they're both rounded up.) At 1000 km, a laser's travel time is roughly 1/300 second the ISS, at 7.66 km/s is a good target. So, for a laser, you have to aim 2/300 ahead of where it is. If the accelerator manages even 0.1%C... 300 km/s you're having to aim for it's location 3.00033 seconds from where you see it. In that time, ISS, can change vector by only a few m/s... not enough to dodge... unless you're side on. but a 100m long ship, some 10m wide, with 1G of thrust can be about D=A×T²/2 so 10×3²/2 is up to 45m off coasting. Now, slow those projectiles down to a more reasonable 10km/s (Phalanx is 1.1km/s in atmo...)and that 1000 km is now 100.3 seconds so D=10×100,600.09/2=50,300.45m... you're having to saturate an area the size of a mid-sized city to hit with that railgun.. It's not the detection range that's the issue, its that they can detect your point of aim soon enough to GTF out of the projectiles' way. Edit: minor formatting issues [/QUOTE]
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