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Leonard Detweiler SD size

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Re: Leonard Detweiler SD size
Post by Brigade XO   » Sun Jul 26, 2015 8:08 am

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So far there is no mention of the Alignment having Manticioran or Grayson compensators so there should be a acceleration challange that keeps them, at best, to SLN accleration/deceleration speed ranges. No a challange for the Ghost sized spy ships or the Sharks (also operating as stealth ships) but certainly a challenge if you have something the size of an SD or perhaps a large commercial freighter that gets picked up on anybody's military tactical equipment. It can't run effectively from much of anything.

This is similar to WW I and WW II submarines. The typical tactic was to use the capability to submerge to be an ambush hunter. They had fairly good speed when on the surface but usually the only time they made an attack comming in on the surface was against merchant shipping that was 1) unarmed and 2) out of range of shore based aircraft. In the open ocean they crused on the surface both for the speed advantage and the need to recharge the batteries which drove the electric engines for submerged work. Against defended/escorted merchnat ships, things got interesting if they were spotted in the submerged attack phase as the only practical defence against the escorts was to go quiet and hope to slip away -slowly- underwater if they could survive and then avoid the initial escort attacks. Any attack against the cargo ships (sucessfull or not) would bring the same challenges, slink away from the escort(s) that had a near idea of where they were.
If the LD is inside a system's hyper limit, contact by one LAC (GA variety) is going to make life very complicated since they may have a difficult time breaking contact. If the LAC or LACs involved get a hit or two on thier target, you then add position markers of debris and outgassing to maintain contact.

How big is practical for a LD? The question of what to do with waste heat is still a major consideration.
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Re: Leonard Detweiler SD size
Post by Jonathan_S   » Sun Jul 26, 2015 8:29 am

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[quote="Brigade XO"]So far there is no mention of the Alignment having Manticioran or Grayson compensators so there should be a acceleration challange that keeps them, at best, to SLN accleration/deceleration speed ranges. No a challange for the Ghost sized spy ships or the Sharks (also operating as stealth ships) but certainly a challenge if you have something the size of an SD or perhaps a large commercial freighter that gets picked up on anybody's military tactical equipment. It can't run effectively from much of anything./quote]amd since you can't use any compensator while under spider drive and the hull form makes installing an impeller drive as well a virtual nonstarter it doesn't much matter how good their compensator tech is. A current SLN SD could out accelerate a spider ship (as could some merchant ships).

Hiding definitely looks to be the order of the day (unless you have the firepower to simply obliterate responding forces)
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Re: Leonard Detweiler SD size
Post by SWM   » Sun Jul 26, 2015 8:57 am

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Brigade XO wrote:So far there is no mention of the Alignment having Manticioran or Grayson compensators so there should be a acceleration challange that keeps them, at best, to SLN accleration/deceleration speed ranges. No a challange for the Ghost sized spy ships or the Sharks (also operating as stealth ships) but certainly a challenge if you have something the size of an SD or perhaps a large commercial freighter that gets picked up on anybody's military tactical equipment. It can't run effectively from much of anything.

Spider drive ships are limited to an acceleration of 150 gees, because they don't use inertial compensators at all. Inertial compensators require an inertial sump to dump into, such as an impeller wedge, which spider drive ships don't have. So they use massive grav plates to counter acceleration forces. They are limited to 150 gees, and not for very long because the grav plates can't counter all of the acceleration.
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Re: Leonard Detweiler SD size
Post by Chyort   » Sun Jul 26, 2015 3:43 pm

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Somtaaw wrote:Its not just Apollo that would be terrifying to the MAlign, but the Ghost Rider drones.

Part of how their stealth works, is by "dissipating" waste heat on the exact opposite side of the ship from known threats. Ghost Rider drones flitting about, with their stupidly efficient stealth means a Lenny Det (or a Shark) has no bloody clue which way to dissipate it's heat. Which translates into eventually cooking its crew, because it's either cook the crew, or get spotted. Either way means death (or dishonor by capture).


The only time they've come near Manticoran tech was Oyster Bay, both Manticore and Grayson branches, and we had that small thing of Sharks passing nearby the Grayson units.


Oh agree for sure, Ghost Rider drones will be key to finding and then fighting them.

But pre-Apollo the missiles would have minutes worth of latency built into any targeting data they are sent, from the SD's that actually can see the ship. Since the missiles cant draw the targeting info from the RD's directly.
And the missiles will all be coming in from a fairly tight vector, meaning they will be completely blind, and unable to do any last minute(or last couple of minutes) corrections on their own. Meaning they are effectively ballistic for those minutes.


Which, brings me back to the original point about why they are Highly unlikely to have bubble sidewalls...
If they were to add a bubble sidewall. They lose all acceleration, meaning they are effectively sitting still. And they give the missiles something they can see on their own without having an RD on the other side spotting for them. Meaning they will get swarmed.


Post Apollo a bubble sidewall might make sense. Since you are suddenly dealing with seconds of targeting lag as opposed to minutes. But that isn't something they can just retrofit into ships already months/years into the construction pipeline. And i still suspect they will value stealth and movement over the minor defense of a sidewall. For example, dump a ton of pods/torpedoes then drive a long distance away from the launch point before anyone knows you are attacking them. Just like they did in oyster bay.
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Re: Leonard Detweiler SD size
Post by Kizarvexis   » Mon Jul 27, 2015 1:36 am

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Pulled the quotes apart to respond to each.

Somtaaw wrote:Its not just Apollo that would be terrifying to the MAlign, but the Ghost Rider drones.

Part of how their stealth works, is by "dissipating" waste heat on the exact opposite side of the ship from known threats. Ghost Rider drones flitting about, with their stupidly efficient stealth means a Lenny Det (or a Shark) has no bloody clue which way to dissipate it's heat. Which translates into eventually cooking its crew, because it's either cook the crew, or get spotted. Either way means death (or dishonor by capture).


The only time they've come near Manticoran tech was Oyster Bay, both Manticore and Grayson branches, and we had that small thing of Sharks passing nearby the Grayson units.


Actually, IIRC, everyone's stealth works that way, it's just that the MAlign took it to an extreme. And it was the Ghost class scout frigates that came near the Graysons. The Sharks only got with a light week the Manty and Grayson systems on the attacks. They dropped out of hyper a light month from Manticore and it took 12 hours for the wavefront to reach the Manty sensors. Another hour to roust out a DD division and 3 hours for the RMN DD's to get to the data point. So 16 hours after the MAlign dropped out of hyper the DD's arrived on scene. The Sharks launched at one light week from the Manties and it took the missiles and torps another 5 weeks to reach Manticore.

Chyort wrote:
Oh agree for sure, Ghost Rider drones will be key to finding and then fighting them.

But pre-Apollo the missiles would have minutes worth of latency built into any targeting data they are sent, from the SD's that actually can see the ship. Since the missiles cant draw the targeting info from the RD's directly.
And the missiles will all be coming in from a fairly tight vector, meaning they will be completely blind, and unable to do any last minute(or last couple of minutes) corrections on their own. Meaning they are effectively ballistic for those minutes.


Which, brings me back to the original point about why they are Highly unlikely to have bubble sidewalls...
If they were to add a bubble sidewall. They lose all acceleration, meaning they are effectively sitting still. And they give the missiles something they can see on their own without having an RD on the other side spotting for them. Meaning they will get swarmed.


Post Apollo a bubble sidewall might make sense. Since you are suddenly dealing with seconds of targeting lag as opposed to minutes. But that isn't something they can just retrofit into ships already months/years into the construction pipeline. And i still suspect they will value stealth and movement over the minor defense of a sidewall. For example, dump a ton of pods/torpedoes then drive a long distance away from the launch point before anyone knows you are attacking them. Just like they did in oyster bay.



The Ghost Rider drones have active sensors, even though they are very rarely used as the active sensors betray the location of the platform. I would expect the Lenny Dets to have bubble sidewalls, even though they would be rarely used, as there are times you might want to use it. Like a massive missile attack that you can't shoot down, so you put up the sidewall at the last minute and then take it down to try and disappear again.

Don't forget, the Sharks were between BBs and DNs, so the Lenny Dets are expected to be larger than SD sized. How much larger we don't know. But what if you put in lots of decoys, say on a spider drone for example, then while your escape velocity from the approaching enemy task force could be low, but with enough decoy spider drones (cry baby cry), there would be lots of vectors to check out. And what's to stop a Lenny Det to carry LACs for insystem work and to meet up with the Lenny Det later, ala a CLAC. Especially, if the LACs were to draw a defender into the path of Grazer Torps and the like. Depending on how stealthly the MAN could make the LACs, you could launch the LACs on a dogleg, so backtracking would take you to the wrong place for the Lenny Det. The same goes for launching Grazer Torps too. While the Lenny Dets are slow and don't have a wedge, I believe there are things you can do to minimize those weaknesses and depending on the other weapons on spider drives, the sneakiness of a Lenny Det attack may be greater than we think.

As I was reviewing my post, I had another thought. I can't think of anything to stop a spider drive LAC from being built to provide defense in depth for a Lenny Det. You only put the defensive LACs a few million km out to deepen the CM/PD bracket. Make your Lenny Det big enough and you can carry LACs, of which ever drive type you need, to provide further protection or long range attack.
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Re: Leonard Detweiler SD size
Post by kzt   » Mon Jul 27, 2015 2:13 am

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Well, you could have the crews in liquid suspension, like Forever War. Iirc, NASA thinks you could handle 35+ g that way. Which would allow the LDs to run at over 1000g.
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Re: Leonard Detweiler SD size
Post by Theemile   » Mon Jul 27, 2015 6:33 am

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kzt wrote:Well, you could have the crews in liquid suspension, like Forever War. Iirc, NASA thinks you could handle 35+ g that way. Which would allow the LDs to run at over 1000g.



The Spider drive has a max speed limit ~250 or so Gs.
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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: Leonard Detweiler SD size
Post by JeffEngel   » Mon Jul 27, 2015 8:37 am

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Theemile wrote:
kzt wrote:Well, you could have the crews in liquid suspension, like Forever War. Iirc, NASA thinks you could handle 35+ g that way. Which would allow the LDs to run at over 1000g.



The Spider drive has a max speed limit ~250 or so Gs.

That limit is based on how much the practical grav plating can soak up and how much leftover g's the crew can handle. kzt's figuring on a different, additional approach to managing the g's the crew take: grav plating plus liquid suspension plus sheer star line endurance - one more factor than the Sharks already had.

The theoretical spider drive acceleration is much higher; the about 250 g figure is what the grav plates and humans (and other systems) are built to handle. Assuming the liquid suspension approach is compatible with the grav plates (I can't see why not), they could get a lot closer to that theoretical limit. The hardware that you can't put in liquid suspension may well set the limit then before the floating humans do.

Still though, if they were going to use the liquid suspension, I'd've thought they would have with the Sharks: it's not likely something that demands a much larger hull, and would have been an important proof-of-concept element to test.
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Re: Leonard Detweiler SD size
Post by Jonathan_S   » Mon Jul 27, 2015 9:21 am

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Kizarvexis wrote:Pulled the quotes apart to respond to each.

Somtaaw wrote:Its not just Apollo that would be terrifying to the MAlign, but the Ghost Rider drones.

Part of how their stealth works, is by "dissipating" waste heat on the exact opposite side of the ship from known threats. Ghost Rider drones flitting about, with their stupidly efficient stealth means a Lenny Det (or a Shark) has no bloody clue which way to dissipate it's heat. Which translates into eventually cooking its crew, because it's either cook the crew, or get spotted. Either way means death (or dishonor by capture).


The only time they've come near Manticoran tech was Oyster Bay, both Manticore and Grayson branches, and we had that small thing of Sharks passing nearby the Grayson units.


Actually, IIRC, everyone's stealth works that way, it's just that the MAlign took it to an extreme.
Some of the BuNine Con-panel talks have suggested that you can dump some of you excess heat through your wedge (where I guess it dissipates into the alpha-wall).

That means that ships sneaking in under a lower powered wedge would have a heat dump mechanism that's not available to spider ships; and therefore wouldn't have beam as much out where a recon done could spot it. (Or course the flip side is that their wedge, even under stealth, is visible from most any angle once you get close enough. The beamed heat is visible further but only if you're exactly in it narrow path - so either approach has tradeoffs)
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Re: Leonard Detweiler SD size
Post by Theemile   » Mon Jul 27, 2015 12:14 pm

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JeffEngel wrote:
Theemile wrote:
The Spider drive has a max speed limit ~250 or so Gs.

That limit is based on how much the practical grav plating can soak up and how much leftover g's the crew can handle. kzt's figuring on a different, additional approach to managing the g's the crew take: grav plating plus liquid suspension plus sheer star line endurance - one more factor than the Sharks already had.

The theoretical spider drive acceleration is much higher; the about 250 g figure is what the grav plates and humans (and other systems) are built to handle. Assuming the liquid suspension approach is compatible with the grav plates (I can't see why not), they could get a lot closer to that theoretical limit. The hardware that you can't put in liquid suspension may well set the limit then before the floating humans do.

Still though, if they were going to use the liquid suspension, I'd've thought they would have with the Sharks: it's not likely something that demands a much larger hull, and would have been an important proof-of-concept element to test.



No, 150 Gs is the Human occupied ship limit due to Grav plating (The MAlign's special grav plates soak up 100% up to 100 Gs, then allow about 1 G for each 10 additional Gs, meaning that at > 100 Gs, the crew is limited to Grav couches) The Spider drive itself is limited to ~250 Gs. Grav torpedoes are limited to this as well, that's why it's been said repeatedly that a Solarian SD or a small, Merchant can outrun the Torps, limiting their overall usefulness if not employed correctly (They are ambush weapons, not chase weapons.)
******
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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