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Escort Carrier Modification

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Re: Escort Carrier Modification
Post by Theemile   » Mon Jun 28, 2021 11:24 am

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ThinksMarkedly wrote:
The Warshawskis have a detection range of 8 light-minutes. So an engagement at 0.2c would give you 40 minutes of warning that there's a grav wave. The LACs would not even get caught unawares and would never cross into the wave. Note that for geometry, this means the furthest point they can catch up with their foe is far short of the wave, since they have to reduce speed and avoid entering the wave in the first place. They must either stop relative to it or reduce speed such that their CLAC can catch up with them and they can be brought in before they ballistically go into the wave. And you can't dock to a ship that is overtaking you at 30,000 km/s relative.

All engagements must also be at low speed relative to the particle background. In hyperspace, exceeding 0.6c is dangerous (I doubt destruction is immediate; most likely it's stochastic and increases exponentially as speed increases). It's possible one could have LACs with specially fitted particle screens so they can survive higher speeds, but unless such a thing is much easier in smaller ships than in bigger ones, it's highly unlikely it is possible at all. Remember that the majority of the time in shipping is spent at cruising speed at the highest band the ship can reach, so if it were possible to cheaply increase that by 16% from 0.6 to 0.7, they would have.

I'm not saying that capital ships couldn't engage at close to cruising speed. It's possible, but highly unlikely, for several reasons. First, there's little range for overtake velocity: even if the opponent is slightly slower, they have enough time to climb to relative rest to their attackers. Second, this applies to missiles too: even though they may get to 0.8c, the 0.2c overtake is paltry and would mean a long ballistic flight. Third, even if you succeed in disabling a ship at cruising speeds or close to it, mounting SAR will be impossible because Newton's First Law still applies. Fourth and most importantly, the pursuers have the advantage, since their missiles have the full 0.6c they can decelerate from and attack their pursuers.

No, what I meant is that LAC engagements won´t happen at cruise speeds because they will be even more limited than missiles from the paragraph above. And unlike shooting back, one wouldn't launch for attack LACs at cruising speed, because then you can't recover them. Those would be suicide missions (using them to thicken missile defensive is another story). So what this means is that if LACs are in play, the speed of all combatants is low enough that they will have enough time of warning of where rogue grav waves are.

One other detail is that even if luring LACs into a grav wave were a tactic, it would be dangerous one. The ship in question must transition from wedge to sails. However quick that is, it may not be quick enough to avoid missiles that are time-on-target to arrive at the exact moment they're supposed to transition!



Very interesting point on the differences in the various combat environments.

<simplifying>

For all intents and purposes, in Hyper, by far your highest chances of being be intercepted are during your accel/deccel phase at the ends of a journey, not the majority of the journey in the cruise phase. During the cruise phase, there is a small chance of running into another ship traveling at shallow angles to your course, and any oncoming ships would be a high speed pass with little time to attack (so good for commerce raiding, bad for piracy).

LACs would only be able to keep pace with a cruising formation, not accelerate away from, during the cruise phase; any that fall behind, will not be able to catch up until the deccel phase of the journey. LACs would only be able to maneuver around the formation IFF the formation is moving sub-max cruise velocity. (which, in turn, makes interception more likely.)
******
RFC said "refitting a Beowulfan SD to Manticoran standards would be just as difficult as refitting a standard SLN SD to those standards. In other words, it would be cheaper and faster to build new ships."
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Re: Escort Carrier Modification
Post by Jonathan_S   » Mon Jun 28, 2021 1:13 pm

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Theemile wrote:

Very interesting point on the differences in the various combat environments.

<simplifying>

For all intents and purposes, in Hyper, by far your highest chances of being be intercepted are during your accel/deccel phase at the ends of a journey, not the majority of the journey in the cruise phase. During the cruise phase, there is a small chance of running into another ship traveling at shallow angles to your course, and any oncoming ships would be a high speed pass with little time to attack (so good for commerce raiding, bad for piracy).

LACs would only be able to keep pace with a cruising formation, not accelerate away from, during the cruise phase; any that fall behind, will not be able to catch up until the deccel phase of the journey. LACs would only be able to maneuver around the formation IFF the formation is moving sub-max cruise velocity. (which, in turn, makes interception more likely.)

I still don't think LACs have a routine use in hyper, but a few more things to keep in mind.

1) The vast majority of hyper is 'rifts' (areas between grav waves) where LACs could operate.

2) Despite that the ships try to spend as much of their time in hyper within a grav wave (where LACs can't operate). [This provides better accelerated, energy savings, and there's no concern about rogue waves while within a steady wave] If possible they even ride the wave right to hyper translation, as that provides a slightly smoother transit through the hyper wall, and correspondingly slightly reduced wear on their drive components. (So a LAC wouldn't be able to cover a ship doing that even during the acceleration/deceleration phase)

3) Ships (like most merchants) with civilian grade particle shielding have a lower top cruising speed than warships (0.5c vs 0.6c) - so civilian convoys can be overtaken (albeit somewhat slowly) by warships assuming the geometry allows the warships to keep the convoy within sensor range)

4) Ships (like most merchants) with civilian grade hyper generators have a low maximum band than warships (Delta vs Theta); much less streak drive equipped ships (Kappa). If the convoy or ship continues on a predictable course a warship can potential jump to a higher band, use that to rapidly close the distance and drop back.
4a) There are a couple major drawbacks to this. The first is hyper generator cycle time, you've probably got to be in the higher band for at least half an hour before you're recharged enough to drop back -- and the target can evade or dive to some other band while you're trying to leapfrog them. Second is the velocity loss you take both leaving and reentering your original hyper band. You might be able to drop out ahead of the target; but you're guaranteed to be moving slower than they are thanks to have velocity drop.


So, while in a rift and escorting a civilian convoy LACs, if deployed, would enjoy both an acceleration and top speed advantage over their convoy. But their top speed is no higher than any of the other escorting or attacking warships.
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Re: Escort Carrier Modification
Post by cthia   » Mon Jun 28, 2021 2:38 pm

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To be honest, I really never thought LACs could operate effectively in hyper. I just didn't see them as having an effective sensor suite for hyper space. I've always seen LACs as purpose built warships without the unnecessary bells and whistles, things like a very powerful particle shielding or an effective sensor suite. I thought an effective sensor suite also calls for a CIC to keep an eye on and interpret all of the incoming data. These wouldn't be needed in n-space, and would add to the size of the LAC so wouldn't be included. Oh well, it's another memo I didn't get.

Although I certainly could be wrong about the particle shielding considering the debris a LAC operates in in n-space. But that particle shielding should require enormous amounts of energy. But to be honest, that has always been an area which requisitions enormous shiploads of handwavium anyway.

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Re: Escort Carrier Modification
Post by Relax   » Mon Jun 28, 2021 2:52 pm

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ONE: With prolong, having military crew with multiple ratings is not difficult.

TWO: Since above is true, having dedicated LAC crew for example would not be necessary.

THREE: Assuming the above 2 are true, are LAC's better at defending convoy's on a $$$ basis during peace? I'll let you get back to your argument, just thought I would clean up the crew possibility that no one is talking about.
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Re: Escort Carrier Modification
Post by ThinksMarkedly   » Mon Jun 28, 2021 8:51 pm

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Relax wrote:THREE: Assuming the above 2 are true, are LAC's better at defending convoy's on a $$$ basis during peace? I'll let you get back to your argument, just thought I would clean up the crew possibility that no one is talking about.


I think so, assuming the problem of having warships in someone else's system is resolved politically. RFC himself said that warships do not have freedom of navigation in the inner system of a foreign polity. But he's also mentioned that having a few LACs embarked could be sufficient escort for a convoy, so there must be a way. At least for some routes.

During cruise, the LACs can accelerate towards a pirate ahead or decelerate to engage a pirate catching up from behind. Assuming they win, they can accelerate back towards the convoy, even if that's a slow 0.1c relative.

Pirates in the direction of the vector of acceleration during the accel/decel phase would also be easily engaged, since the LACs can do 3x to 5x the acceleration of freighters. Or infinite: the convoy can simply stop accelerating while the LACs engage. Note this applies both in hyper and in n-space, unlike the previous paragraph.

In the opposite direction of the vector, that's another story. That is, a pirate stern chasing a convoy that is accelerating or one that positioned ahead of a convoy that is decelerating. In this case, the tactic would be for the LACs to not accelerate, so they can engage the pirates away from the convoy, but the problem here is the time: how long does it take for the LACs to deal with the pirates?

None of this applies to commerce raiding. An LAC or a pair of them would not be worth much against a proper warship, even a destroyer, manned by a competent crew. Moreover, both the LACs and the ship that launched them are valid military targets, unlike the rest of the convoy.
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Re: Escort Carrier Modification
Post by Galactic Sapper   » Wed Jun 30, 2021 10:55 am

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Jonathan_S wrote:And speaking of escape pods -- In a lot of ways (despite being far larger) LACs would actually be easier to deal with than escape pods.

An escape pod is a compromise of a conventional warship's capabilities.
* Their launch tubes are more opening in its armor, and take up hull space that could otherwise carry sensors or weapons;

* Their need to be accessible from deep in the ship (engineering, bridge, CIC, etc.) means large escape pod pathways opening addition voids in the ship and taking up extra volume.

So escape pods are necessary, but there's a trade-off. For a given size/tonnage more pods, in more places, with more launch tubes will increase the ability of the crew to successfully abandon ship; but that extra ability comes at the expensive of weak spots in its armor, smaller/fewer sensors, and less weapons and point defense mounts. So designers need to balance escape pods against combat capability.

But with a CLAC the LACs are its main armament; and so the correspondingly command priority for its broadside space; and they mount no broadside offensive weapons; only point defense. The LACs don't need to be brought deeper into the hull than necessary to close the bay hatch behind them.
The bay doors are weak points in whatever armor might be applied to the CLAC's broadside; but a CLAC isn't supposed to be engaging in slugging match. At least the core armor around engineering, the bridge, CIC, etc. would be inboard of the LAC bays and thus wouldn't be pierced for LAC access like it is for escape pod tubes.


LACs are far larger, and their bays take up far more broadside space than any plausible number of escape pod tubes. But as they are the ships main weapons making space for the isn't a trade-off of its combat capability; it's the creation of that capability.

Going back a ways for this reply, but:

Escape pod tunnels are probably capped with blow out panels where they breach the hull armor, covering most of the weak point prior to the pods being launched. IIRC it was possible to tell if a ship's pods had been launched by visual inspection of the hull, which would probably be due to said hull panels being blown out.

Second, escape pod tunnels don't reach all the way into the core hull. As seen when Michelle abandons ship - there's only enough escape pods for about half the crew, as the other half have battle stations far enough inside the ship to make escape pods impractical. That's why they have to abandon ship in pinnaces from the boat bay instead. Likewise for any number of Solly ships we see abandoned or scuttled, they have to use their small craft as well as escape pods to get the entire crew off because there isn't enough room for everyone in the pods. If memory serves, Crandall's SDs didn't have the lift to remove everyone in one launch even using the pods and small craft combined; there were still a few hundred crew aboard after everyone else evacuated.
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