kzt wrote:Galactic Sapper wrote:You're missing this. He had enough pods to throw that many salvos as big as the ones he did throw, and simply chose not to use them.
Exactly. He had the ammo and fire control to throw TWENTY-SEVEN Avalanche salvos. He was predicting that he'd have time to fire about 12. He actually fired 7 (or 12,600 pods), with the vast majority of his 49,000 pods last seen heading out into deep space at 20,000 km/sec with the rest of the wreckage of home fleet.
Those numbers sound way too large at first, but could be right. Let's see if it's mathematically possible. You wrote below 28000 externally-mounted pods. With 90 wallers to tractor onto, we get a average of 300 per ship. Is that feasible? I'm completely ignoring the 12 BC(P)s here, they're a rounding error.
I'd say it's in the order of magnitude of possible. 30 would be too few and 3000 per ship would be unbelievable. It also matches your numbers below.
Anyway, what you're both telling me is that he had more pods tractored to the hulls of the SDs than he had control links for anyway, so any salvo where Home Fleet was still controlling the missiles would not exhaust the ammo anyway. And that he could fire 27 maximum salvos.
The time between the last few salvos might have been longer, though, but probably not enough to make a difference. My thinking is that the SD(P)s are rolling pods from internal storage while everyone using the external ones. After that, everyone is using those rolled pods. But I guess you fire more than you can roll, so at some point you catch up to what's being rolled.
Edit: I said 35 earlier, it's only 27. So Home has enough ammo to continually fire Avalanche size salvos for 29 minutes.
With a time of flight conservatively estimated at 12 minutes due to the mid-range unpowered segment that means Home fleet has fired almost 20,000 of the 28,000 externally mounted pods, and after another 4 minutes all the externally mounted pods are used. So you can shoot the pods instead of abandoning them.
Could D'Orville have thought he could get through the 3200 LACs and destroy a sufficient fraction of the 240 SD(P)s with those 12 salvos, and that his fleet would be mostly intact after the exchange? On one hand, the number of missiles would say so. From your numbers, each salvo consisted of 1800 pods (20 per ship), which is 21600 missiles if those are 12-missile pods. If he needed to destroy or cripple 240 wallers in 12 salvos, it means 20 wallers per salvo or 1080 missiles per SD.
In actual fact, the 7 salvos totalled 151,200 missiles and destroyed 97 SD(P)s, crippling 19 more. That's an average of 1303 missiles per mission-kill. So my calculation is not too far off. If he had fired all 12 salvos he expected to, an increase of 71% against a depleted enemy, we could expect Second fleet to have become mission-ineffective.
The second aspect of the reasoning would be whether his fleet would be reasonably intact after this exchange. If he couldn't expect it, then there's no point in holding back. As you've both pointed out, the more missiles flying the better. And besides, you don't want to rely on luck, you go for the overkill. So could he have thought he'd have survived? From the Battle of Lovat, we know 6 Sovereigns of Space fired 1152 missiles per salvo and Task Force 82 consisting of 2 Invictus-class easily parried such salvos off. Even a combined 11000 missile salvo failed to mission-kill both SD(P)s then. Against 240 Sovereigns of Space, one would expect a normal launch of 46080 missiles, to be defended by 90 SDs, or 512 missiles per ship on average. Even if the weight of defence was on the SD(P)s, we're talking 1097 missiles per ship on average. And I think the Harrigtons and Medusas are comparable in defence to the Invictus.
The problem here is that these margins are razor-thin. And that D'Orville had to be counting on Second Fleet not having rolled pods and firing a much bigger salvos that could and would overwhelm his defences. So it was irresponsible not to fire earlier. If 12 salvos were thought to be sufficient and you have the ammo to spare, plus reinforcements coming, fire 18 or 24 salvos.
I don't think that's possible he thought he'd survive with most of his fleet intact. At 2.5:1 odds, Havenite and Manticoran hardware is just about equally matched, so he ought to have expected to lose a significant chunk of it. The insight into his thinking reveals he did expect that to happen. And if you can't guarantee that your enemy is obliterated and you're mostly intact after the exchange, there's no point in holding ammo back.
In addition, after those 5 salvos go out and hammer Home Fleet they have about 314,000 more missiles (minus those ships that get blown up of f-killed). [Note it takes about 8,000 Haven missiles to kill a RMN SD(P)]. So how long do they want to keep firing given the very long time of flight? They go through 10% of their ammo every minute, so in theory they could shoot themselves dry and then watch Home blow up with all their remaining 300,000 missiles still flying towards it.
Where did you get the 8000 missile number? From the Battle of Lovat, we know the Alliance allocated 144 Apollo pods per ship, or 1152 missiles (not counting the control one) and the RHN defences stopped less than a third of that (700 out of a 2304 salvo). Granted, those were Apollo. But what we saw from the actual engagement in Manticore was that the 7 salvos of 21600 missiles (151,200) killed 97 RHN SD(P)s and crippled 19 more, only 1303 missiles per mission-kill.