ThinksMarkedly wrote:30 seconds is enough to fire PDs and maybe launch CMs. Especially for a ship that is already at general quarters and advancing on an enemy. For an RMN ship, launch maybe even more than one wave of CMs.
Anyway, this geometry doesn't make sense. No enemy ship is expected to close to 30 seconds missile flight time to the pods. Even a Cataphract CM stage running at 130000 gravities would cover less than 600,000 km (2 light-seconds). That's energy weapon range and you can't detect the energy weapon before things start exploding on your end.
BTW 130,000 gees is the accel of a Viper/Mk31 CM, we've never seen a Cataphract 2nd stage with that acceleration (though the latest versions might actually exceed it). The original Cataphracts 2nd stage could only do 98,000 gees - but the final ones seen in UH might have a 2nd stage with up to
[1] a ludicrous acceleration of about 261,000 gees! That seems crazy, and we don't get a direct measurement of the 2nd stage acceleration; but its 1st stage could presumably do 171,400 gees at full power - given its observed accel for 3 minutes (implies 50% power); so maybe the CM could do about 260,000.
If their accel actually is that high they'd have a 30 second range of 1.1 million km. But even that means they're launching within CM range of their target (even pre-war CMs had 1.2 - 1.5 million km ranges). And their terminal velocity is low, only about .25c. So they're sitting ducks for defenses designed around stopping mass salvos of missiles moving at 0.8c. It's going to take them at least several seconds to cross PDLC range - which is an eternity.
And of course anybody with more mainstream missile performance (say Manticore) their capital missiles would be restricted to a far more pedestrian 92,000 gees, which means they can only cover 405,720 km in 30 seconds, which means, as you pointed out, they launch with 0 velocity well inside energy range (if outside of PDLC range) so the ship's main energy mounts should have no trouble picking off the glacially slow missiles. And even once they close to PDLC range it'll probably take them upwards of 6 seconds to cross it, at less than 0.1c. They'll be slaughtered.
Missiles need to be launched far enough out that they can build up an effective terminal velocity (or like the RHN DD did at Blackbird, within energy range so there's only a second or two from launch until laserhead detonation). (Or else launched in such vast numbers that even perfect point defense simply can't kill them all in time)
[1] Inferred base on some math with the numbers given. But we only got given the 1st stage accel, drive endurance, and anticipated range. Also unclear if the range give was from "at rest" or not - if it factored in the base velocity of a ship the missile accel would be far lower to reach that same range.