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Subject: Would it be better to build more Burkes rather than DDG 1000s?
Charles99    3/17/2008 6:53:39 PM
Or an incremental improvement of hte Burke? Given the economy and the already high expense of the DDG-1000's, we might end up with a very small number of high end platforms. The Burkes aren't going to be as capable, but on the other hand, we might be able to build more of them, and I'd lay odds that they'll still be the most powerful surface combatant on the oceans for a good long time. Would it make sense to go for more of the good as opposed to a little of hte best, or does the DDG-1000 give such a tremendous leap in capability that it would be better to buy them, even if only a few?
 
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doggtag    scratch that...   3/26/2008 10:01:42 AM
Again, this partially comes back to issues of just how many of those on-hand missiles do we need?
300 mix-n-match VLS shots, roughly ESSM sized rounds each,
already gives us:
 
Strike the "roughly ESSM sized rounds each" part, as it should have read "roughly P44/AMRAAM-sized".
The only way we'd get 300+ ESSM-sized rounds on a single ship would be larger Mk41 arrays, or multi-packing them by more than 4's into Mk57s.
 
My bad.
 
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B.Smitty       3/26/2008 11:22:38 AM

I have said that reloading at sea is an issue.  However we did develop a mechanism to do so, we just deemed it unnecessary and removed it.  Certainly a new, more effective system could be developed at far less expense than a massive gun mount with automated magazine. 

(B. Smitty)

 

Again, this partially comes back to issues of just how many of those on-hand missiles do we need?

300 mix-n-match VLS shots, roughly ESSM sized rounds each,

already gives us:

-more SAMs than most nations we'll face have aircraft to shoot down (are our naval SAMs so unreliable that we'll need at least a 2:1 ratio to guarantee kills?)

-more ASW rockets/torps than said nations have subs to sink,

-and still have nearly 100 surface attack rounds, which is still a helluva lot of targets (and with a 90kg-sized POLAR warhead, a good many of those could be targets that even SDBs can't tackle).

 

Station just two USN ships equipped with those 300-shot VLS arrays (not every threate nation can lob BMs at us, so SM-3 ABM capability isn't always a necessity, either),

and you've got enough firepower off a given nation's coast that could seriously cripple any warfighting ability within reach of those vessels.

So it may not even be necessary to even have to UNREP a VLS array, which was one of the other arguments for removing strikedown/reloading equipment from USN ships: just how many of our how-many-thousand VLS cells will we ever actually need to use in a given conflict?

Will a given vessel actually need to expend every last munition to accomplish a mission, without having fully-stocked vessels coming to relieve it before the ship reaches zero missiles left?

I would agree if we were just talking about striking point targets.  But area and suppressive fires demand a lot of munitions - guided or not. 

But yes, this starts to become a corner case, especially if you still have a gun to cover shorter-ranged engagements of this sort, and if you're willing to move closer to shore. 



 
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doggtag       3/26/2008 12:10:01 PM



I would agree if we were just talking about striking point targets.  But area and suppressive fires demand a lot of munitions - guided or not. 

But yes, this starts to become a corner case, especially if you still have a gun to cover shorter-ranged engagements of this sort, and if you're willing to move closer to shore. 



Generally, I might agree.
But the whole purpose of creating guided shells with the near-surgical precision that GPS gives us isn't intending their use for area and suppression fires.
(Field use with Excaliburs in A-stan, and eventually Iraq, will confirm or deny this more, depending on their success rate).
 
So seeing as the LRLAP-equipped AGS seems to have had its unguided shell requirement/capability removed,
I therefore used the same argument for this proverbial "Land Attack Burke" (or whatever other vessel): precision, surgical strikes moreso than general fire support where we just saturate an area with unguided shells and hope for the best (this isn't the coast of France in 1944 or Guadalcanal in 1945 anymore. No one has an excessive amount of heavily-reinforced coastal emplacements that need D-Day type barrages of massed fire support to crack the enemy's defenses).
 
Notice that the only real large scale carpet bombing we've done since VietNam was the Desert Storm strike on the Highway of Death, that section of road where supposedly the entire Iraqi Army was vacating Kuwait from.
It proved to be more of a target of opportunity (and stupidity on the enemy's part, for even allowing themselves to be caught so), because notice that we've never carpet bombed any Iraqi cities outright,
nor so have we carpet bombed any Afghani cities or entire valleys (not on the scale of WW2 or Viet Nam).
 
The whole point of theses latest precision weapons is just that: why cut off an entire arm or leg when PGMs allow just removing the infective tissue?
 
If you really want to go the saturation fire support route, then secure your land areas and use all the towed guns you can muster.
Otherwise, I want as much surgical precision as possible: a B-2 dropping 16 trajectory-correctable JDAMs is a better option than releasing a stick of dumb bombs and hope I at least take out something of value to the enemy.
 
Besides, as for suppression fires: doesn't it make more sense to just elimiate the threat altogether, rather than firing off aimed but still indiscriminate shots that there's no guarantee will achieve any destruction on our adversary, and might even encourage him to dig in deeper (Viet Nam & A-stan caves & tunnel networks).
I want the precision to attack the hidey-holes and escape tunnel entrances, not just pulverize a countryside and hope I hit something worthwhile.
That's why AGS will have its GPS-precise LRLAPs shells, rather than having a 20-30rpm rate of fire to saturate an area with unguided munitions.
 
If I really need to target a large staging area or equipment compound, that's where those DPICM-submunition carriers come in handy.
Or if I have a flotilla of rapidly-closing terror boats, then I want more massed shell volleys the closer they get (ideally, equipped with multi-option 3P-type fuzes for whatever caliber deck gun(s)).
Otherwise, I still want the surgical precision, so if I can procure steerable shells that cut down on the number of shots needed, all the better (reduces barrel wear if I need fewer rounds, so I'm servicing my gun less often).
 
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doggtag    sorry for all the fast-fingers fudging...   3/26/2008 12:14:14 PM
...should've said, "this isn't the coast of France, Italy, or the PTO in 1942-1945."
 
 

 

 
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B.Smitty       3/26/2008 1:34:25 PM



Generally, I might agree.
But the whole purpose of creating guided shells with the near-surgical precision that GPS gives us isn't intending their use for area and suppression fires.

(Field use with Excaliburs in A-stan, and eventually Iraq, will confirm or deny this more, depending on their success rate).

 

So seeing as the LRLAP-equipped AGS seems to have had its unguided shell requirement/capability removed,

I therefore used the same argument for this proverbial "Land Attack Burke" (or whatever other vessel): precision, surgical strikes moreso than general fire support where we just saturate an area with unguided shells and hope for the best (this isn't the coast of France in 1944 or Guadalcanal in 1945 anymore. No one has an excessive amount of heavily-reinforced coastal emplacements that need D-Day type barrages of massed fire support to crack the enemy's defenses).

 

Notice that the only real large scale carpet bombing we've done since VietNam was the Desert Storm strike on the Highway of Death, that section of road where supposedly the entire Iraqi Army was vacating Kuwait from.

It proved to be more of a target of opportunity (and stupidity on the enemy's part, for even allowing themselves to be caught so), because notice that we've never carpet bombed any Iraqi cities outright,

nor so have we carpet bombed any Afghani cities or entire valleys (not on the scale of WW2 or Viet Nam).

 

The whole point of theses latest precision weapons is just that: why cut off an entire arm or leg when PGMs allow just removing the infective tissue?

 

If you really want to go the saturation fire support route, then secure your land areas and use all the towed guns you can muster.

Otherwise, I want as much surgical precision as possible: a B-2 dropping 16 trajectory-correctable JDAMs is a better option than releasing a stick of dumb bombs and hope I at least take out something of value to the enemy.

 

Besides, as for suppression fires: doesn't it make more sense to just elimiate the threat altogether, rather than firing off aimed but still indiscriminate shots that there's no guarantee will achieve any destruction on our adversary, and might even encourage him to dig in deeper (Viet Nam & A-stan caves & tunnel networks).

I want the precision to attack the hidey-holes and escape tunnel entrances, not just pulverize a countryside and hope I hit something worthwhile.

That's why AGS will have its GPS-precise LRLAPs shells, rather than having a 20-30rpm rate of fire to saturate an area with unguided munitions.


We won't always have the high-rez targeting needed to permit surgical precision. 

In OIF, during a Thunder Run into Baghdad, there was an instance where soldiers used the angle that an Iraqi dud mortar round that was sticking out of the ground to calculate roughly where the mortar was.  They looked at a map, found a likely firing spot, and called for fires, silencing the mortar.  They didn't have precise coordinates.  They had a rough idea where it was and needed an area suppressed.

The fog of war will prevent us from using precision fires every time. 

We have to add guidance to long-ranged weapons, period.  Supporting Marines from 80nm away does no good if you can only guarantee rounds hitting within a half mile of your aimpoint.   So LRLAP, ERM and our notional 7" missile will need guidance, even for area and suppressive fires.

Field uses, to date, of Excalibur and GMLRS are precision shots because that is what is needed in these conflicts.  These days, we can't just pulverize a city block in downtown Baghdad.  And when we had to, we had the luxury of time to move guns forward. 

The point of robust NSFS is to support Marines before they've had a chance to move their artillery ashore.

 
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Herald12345       3/26/2008 5:31:47 PM

Why?  Because ESSM has a 10" motor section.  So four-packing produces a container that is at least 20" x 20" (more with spacing, container thickness, etc.).  A Mk41 is only sized to carry 21" diameter weapons. 

A ~7" missile packed 3x3 would be at least 21" x 21".  If that's too big, then make it 6.6" diameter (3x3 = 19.8"x 19.8"), but longer, it doesn't really matter.  One can play with the sizing to fit the cells.  There is plenty of vertical length left for longer missiles.  Even tactical Mk41 cells can handle 16.6 foot long VL-ASROCS. 


You don't get a long thin 6 inch diameter rocket that burns steadily for 20+ seconds to give you 100n km range without giving up a lot of mass to contain the pressure of the burn as that SRM burns in to out in long thin case. You don't get much payload either that way either.  What do you know about rockets specifically? Telemetry is more my schtick, so I need sa good feel for how ignorant we both are on this subject. 

How much space are you giving up for fins? Separator sleeve walls? etc.etc.etc.

The rocket needs guidance. Thrust vanes are an ild bit as well as aero-ruddersa on the nose of the killbody as it plunges back into the atmosphere. Mister Rocket 6 inches diameter skinny and twenty feet long? If it  vibrates  too much or if it undergoes unplanned compression loading during acceleration, do you see what a 40/1 length to diameter cylinder undergoes if you have to apply 2g  side shove at Mach 6? SNAP.

Your rocket will be more like 13/1 to 15/1 as a SAM or SSM. In some cases it could be a 20.5/1 AAM telephone pole.

40/1 maneuvering rocket starts to bother me.

Herald


 
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doggtag    length to diameter ratios   3/26/2008 6:53:32 PM
Points well taken, Herald.
But who says we need to keep a 40:1 ratio for the whole flight?
Don't the Extended Range versions of Standard SM-2s (and -3 ABMs) drop their booster sections after use?
Would this surface attack round fare any differently?
(Although yeah, a 40:1 does seem extreme.)
 
Would we really need something in a 6-to-7-inch diameter missile to be 20 feet long to get a comparable payload to ranges equal to or exceeding that of the LRLAP?
(we've already established that an AGS turret needs a lot of barrel clearance for turret traversing, but how deep does the proposed reduced-magazine-capacity model sit into a Burke hull with all its fixin's?)
That Israeli LAR-160-derived naval rocket system (6.3-inch diameter) from the Armada pdf you posted up has the potential to get there (even if not currently in a VLS-friendly format), in a variant that wouldn't need to be 20 feet long to get the job done with futher development of rocket motor-to-warhead size ratios, as well as an adequate fin/strake design (Argentina had a same-diameter CAL-160 under development, carrying a 50kg warhead to 30km in a length of just under 11feet at 110kg weight).
 
Any SAM or SSM could see incremental range increases if fitted with expendable launch boosters.
 
I think you're over-exaggerating B.Smitty's idea...
 
 
 
 
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B.Smitty       3/26/2008 9:58:59 PM


You don't get a long thin 6 inch diameter rocket that burns steadily for 20+ seconds to give you 100n km range without giving up a lot of mass to contain the pressure of the burn as that SRM burns in to out in long thin case. You don't get much payload either that way either.  What do you know about rockets specifically? Telemetry is more my schtick, so I need sa good feel for how ignorant we both are on this subject. 

How much space are you giving up for fins? Separator sleeve walls? etc.etc.etc.


Frankly Herald, I don't know that much about rockets either, so I am probably the more ignorant one.  But I would like someone who is knowledgeable to tell me why it won't work.

I don't think it needs to be 20' long, but I could be wrong.   If we can get 70km out of a 7" diameter, 7' to 8' long P44 (12/1-13.7/1), I have to believe that just adding a 4 foot  extension (or booster stage) would be enough to meet the range reqs.  This would result in the same L/D as AMRAAM, but this missile doesn't have to survive high-G turns like an AAM.  Given this, i think there is room for it to be a touch skinnier for sizing.  Plus, according to the Mk41 Strike length pdf I posted earlier, the TLAM AUP max diameter is actually 23", so there may be a bit more space to play with. 

And there's no way this thing needs to go Mach 6.  It's not an ABM or SAM. 

And as far as payload goes, this missile is competing with LRLAP and ERGM, not POLAR or ATACMS, so the 28kg P44 warhead is perfectly acceptable to me.


 
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B.Smitty       3/26/2008 10:00:45 PM
Correction:  TLAM AUR, not AUP. 
 
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Herald12345    I am not.    3/26/2008 10:45:03 PM

Points well taken, Herald.

But who says we need to keep a 40:1 ratio for the whole flight?

Don't the Extended Range versions of Standard SM-2s (and -3 ABMs) drop their booster sections after use?

Would this surface attack round fare any differently?

(Although yeah, a 40:1 does seem extreme.)

 

Would we really need something in a 6-to-7-inch diameter missile to be 20 feet long to get a comparable payload to ranges equal to or exceeding that of the LRLAP?

(we've already established that an AGS turret needs a lot of barrel clearance for turret traversing, but how deep does the proposed reduced-magazine-capacity model sit into a Burke hull with all its fixin's?)

That Israeli LAR-160-derived naval rocket system (6.3-inch diameter) from the Armada pdf you posted up has the potential to get there (even if not currently in a VLS-friendly format), in a variant that wouldn't need to be 20 feet long to get the job done with futher development of rocket motor-to-warhead size ratios, as well as an adequate fin/strake design (Argentina had a same-diameter CAL-160 under development, carrying a 50kg warhead to 30km in a length of just under 11feet at 110kg weight).

 The guided version still has a 12 km myopic range and its effective MER is about 12-35 km. That is considerably short of the 100km standoff.

Any SAM or SSM could see incremental range increases if fitted with expendable launch boosters.

That doubles the MASS of the rocket. 

I think you're over-exaggerating B.Smitty's idea...

 
If anything the step rocket makes the inverted pendulum problem WORSE.

And you are using an existing adapatable VLS. That isn't SYLVER, which stupidly lacks the capacity to adapt electrical interfaces and accept collared launch cells much larger than the crap ASTER. So that leaves you the  short, medium, and long versions of the Mark 41 which is so designed to accept a broad family of 21 inch/25+ foot length boosted weapons. 

Note that most of the rockets suggested this far are in the 25-60 kn ballistic range and are larger modifications of existing  single stage rounds? 

 



Herald
 
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