ThinksMarkedly wrote:cthia wrote:10 years ago, could the RMN still have launched on the reserve and avoided Ganymede's defenses, like now?
Yes, but they wouldn't do it.
Technically, the Mk14 ERMs and even the Mk13 could have likely avoided the defences of Ganymede and inflicted serious damage to what the RMN commander would have wanted to hit. Nowhere as good as Mk23 of course, even the pre-Apollo ones, but those missiles had already been ahead of the SLN Javelins before successive iterations against the war with Haven made them even beter.
SDMs have a regular range of about 7.5 million km, which is under half a light-minute. ERMs extend that to 17 million km, which is close to a full light-minute. Jupiter's hyperlimit has a radius of 3 light-minutes. So with SDMs, even the extended range ones, the attacking force would need to travel at least 2 light-minutes into the limit, which takes an hour. That's an awfully long time, but avoiding hitting Jupiter is pretty easy, so the fleet doesn't need to decelerate after launching and can just cut a chord and exit on any vector after about another hour and still be at only 0.1 c so it can transit out of the system.
They'd also need to have brought a lot of ships to tow enough pods. It's totally feasible for them to have rolled pods from the colliers before making their alpha translation into the Jovian system, so they could have brought sufficient missiles. But firing even a quarter as many as Honor did would have strained their capabilities.
So it could be done.
I don't think the ERMs were in service 10 years (1912 PD) ago. The earliest class we know of that carried any type of ERM was the Sag-B with her Mk14 ERMs; and HoS tells us that those didn't start entering service until 1917. (And the first SD(P)'s with their early MDMs weren't in service that early either, as they starting coming in in 1914).
I'd picked that time in my example specifically to be before any of the extended range missiles came into play.
Also, while the seekers, ECM, and programming of the RMN's single-drive missiles would have been better than the SLN's Javelin; we discovered that the SLN actually had slightly better SDM missile drives.
The Javelin (and counterpart) missiles that Ganymede would have been lobbing back at attackers would have been almost 3.5% quicker (at 47,600 gees) than the RMN's missiles; and thus had that same relative advantage in terminal velocity and maximum range (7.55 million km from rest compared to the Mk13's 7.30 million).
(Now the base velocity of the RMN ships would have added to their missile's range; but it also increases the range at which the Javelins can launch because the RMN ships are coming to meet them. And in the 3 minutes an SDM missile is under power likely doesn't give the RMN ships enough time to alter their vector such that they can land a powered salvo while still themselves staying out of that slightly longer ranged Javelin's powered envelope)
Still, if the Reserve is scattered around Jupiter along Ganymede's entire orbital track then the furthest Reserve cluster, on the far side of Jupiter from that moon, would be about 2.1 million km away it. So you should be able to engage at least a portion of the Reserve while avoiding the heaviest defenses -- though there are presumably some missile and point defense platforms scattered around the entire orbital path of Ganymede (if not some seeded even further out) and so you'd have to tangle with those. You'd also potentially have to face the active SLN forces stationed at Ganymede (which included some unspecified number of SDs when Honor attacked); as those could come around Jupiter to engage you. But even so it should be possible to wreck a non-trivial percentage of Reserve One while staying far enough from Ganymede itself to avoid directly taking on the brunt of the extra defenses concentrated around it.