Showing posts with label Cruiser. Show all posts
Showing posts with label Cruiser. Show all posts

Thursday, November 2, 2023

What’s Old is New Again

The cruiser’s six 8” guns trained and elevated, aimed at an uninhabited piece of rock rising from the ocean.  The guns paused, ever so briefly, and then roared as a salvo of six 260 lb high capacity (HC) shells exploded out of the barrels and arced towards the rocky target some 30,000 yds (17 miles) away. This was just a routine daily function check but within the next 24 hours it would be real.
 
8" Guns of the USS Des Moines


The US and China were at war after China had initiated the long anticipated ‘reunification’ assault on Taiwan.  The two sides were now locked in an ongoing battle for Taiwan that was eerily reminiscent of Guadalcanal as both sides sought to reinforce the island.  While it might not be Ironbottom Sound, the waters to the east and west of the island were littered with the sunken hulks of dozens of naval vessels of both sides.
 
As part of the invasion, China had seized the large northern Philippine island of Luzon and established naval and air bases on the northern Philippine islands, thereby protecting the southern flank of their Taiwan assault.
 
The US was determined to eliminate the Philippine bases and sites so as to open the southern flank of the Taiwan invasion to counterattacks.  The mission cried out for massive cruise missile strikes but the US cruise missile inventory had been severely depleted during the first four weeks of the war.  Though it should have been easily anticipated, it had come as a shock to the Navy that much of the missile inventory depletion had been the result of ships being sunk with most of their inventory still aboard and so it was that much of the Navy’s cruise missile inventory was sitting at the bottom of the ocean in unexpended VLS cells on sunken ships.  Any available cruise missiles were dedicated to the main Taiwan defensive effort and, as a result, there were none available for the Philippine operation.
 
The Chinese bases in the Philippines were heavily defended by SAM batteries and aircraft and the few US aircraft attacks had been failures.  As with the cruise missiles, the bulk of available US aircraft were dedicated to the immediate Taiwan action and only an occasional raid could be mounted against the Philippine bases.  China was managing to rebuild and repair the bases almost as quickly as the US could inflict minor damage.
 
With insufficient cruise missiles, and industry being unable to supply new stocks in any useful time frame, the US decided to attack the Chinese forces in the Philippines using the old fashioned method of large caliber naval guns, an option made possible by the recent – and much maligned - construction program of a small class of 8” gunned cruisers.
 
A task force of 8” gunned cruisers and Burke escorts was assigned to approach the Philippines from the southeast while a carrier group provided an electromagnetic ‘beacon’ to the northeast as a diversion.  By working its way up the Philippine islands, the cruiser task force was hidden, to an extent, in the electromagnetic shadow of the islands.  Along with strict EMCON, the cruiser group was as well hidden as was possible.
 
The task force cut across the Philippines south of Leyte, through the Surigao Strait, then north into the Visayan Sea and then west to emerge around the southern tip of Mindoro, 150 miles south of Manila where the Chinese were operating a large logistics and naval base.  The group then headed north, hugging the coast of Mindoro until reaching the small island of Lubang and rounded it on the eastern side, finally emerging just 60 miles south of Manila.
 
At this point, the escorting Burkes split off from the cruisers and proceeded at full speed for Manila, tasked with shooting up the various port facilities and ships and, most importantly, to act as bait for the main Chinese naval force tasked with protecting the Taiwan assault’s southern flank.
 
About 30 minutes into the Burke’s high speed dash for Manila, they were finally spotted by a patrolling plane which was approaching Manila to land after returning from a patrol.  Having finally succeeded in attracting the Chinese attention, one of the Burkes promptly activated its radar and shot the plane down with a Standard SM-6.  The entire group then began radiating and shooting any aircraft that appeared, thereby ensuring that the Chinese would take notice and respond.
 


The Chinese task force protecting the Philippines and the southern Taiwan flank and operating about 300 miles to the northwest of Manila, was surprised at the reported appearance of a US surface group closing on Manila.  They immediately turned south, racing to meet the US destroyer group but it would be about two hours before the Chinese group would be close enough to launch their few anti-ship cruise missiles.  China was suffering from the same shortage as the US although superior industrial production allowed them to allocate at least a few cruise missiles to the Philippine portion of the invasion operation.
 
Arriving at Manila, the Burkes sailed into Manila Bay.  A Chinese Type 052D destroyer (roughly equivalent to a smaller Burke) was docked, undergoing emergency repairs from damage received supporting the Taiwan assault.  The Burkes spent about ten minutes concentrating their 5” fire on the helpless destroyer but had no weapons capable of quickly sinking the ship, however, their concentrated fire did leave the ship a blazing hulk.  Having accomplished that, they quickly shifted their focus to other targets.
 
Dozens of merchant ships of various types lined the docks and piers but, again, lacking heavy torpedoes or large caliber guns, the Burkes could not do serious damage to them and opted, instead, to concentrate on the shore facilities.  The facilities, being largely ‘soft’ targets were susceptible to 5” gunfire but the fact that the Burkes only had a single 5” gun each severely limited the amount of damage they could do.  Nevertheless, the Burkes moved as close as possible to the shore, shooting targets of opportunity with their 5” guns at near zero range. 
 
As the Chinese task force reached its maximum launch range of around 250 miles the commander faced a difficult tactical choice:  should he shoot his limited supply of anti-ship cruise missiles first with a good general location of the targets but no precise targeting or wait until he had precise targeting and risk the US getting in the first shot?
 
The commander opted to shoot first, believing that the missile’s on-board intelligence would find and prioritize the targets.  Better, he thought, to get in the first shot, even if it was less effective than it might be if he waited. 
 
About three dozen of YJ-18 anti-ship cruise missiles were quickly launched and began their 20 minute, Mach 0.8 cruise toward the US ships in Manila.
 
Having received a near real time launch warning from one of the few remaining dedicated surveillance satellites, the Burkes used the intervening fifteen minutes to release floating decoys into the harbor and then, literally, sailed up against port facilities, physically touching docks and shore facilities as they waited for the incoming missiles to arrive.
 
As the attacking missiles reached the target area and began their Mach 2+ terminal sprint, their electronic brains were confused and overwhelmed by the many dozens of decoys and ships of all types in their fields of view.  Worse, their IR and Electro-optical sensors were overwhelmed by the sheer number of heat sources and large, potentially valid images presented by the burning buildings and port facilities.  The terminal Mach 2+ speed worked against the missiles by hugely reducing the amount of time the missile’s onboard processors had to discriminate the intended targets.  In the handful of seconds the missiles had to find a target, only one missile locked on to a Burke (probably just by random chance).  The missiles began impacting on merchant ships and dock facilities.  The single targeted Burke launched two ESSM defensive missiles, one of which exploded near enough to deflect the attacking missile into the water.
 
After launching their anti-ship missiles, the Chinese task force continued at high speed towards Manila to mop up whatever US destroyers survived the initial attack.  Having survived the Chinese attack unscathed, the US destroyer group opted to remain in the harbor rather than emerge to meet the on-coming Chinese task force.  This denied the Chinese ships any clear targeting and forced them to close to visual distance for identification and targeting for both anti-ship missiles and the Chinese 130mm (5.1”) guns.
 
As this was happening, the US cruiser group had been sprinting up from the south at maximum speed.  The Chinese commander, his attention completely focused on the US destroyers and the battle in front of him, did not detect the cruisers approaching from his rear.  His sensors, helos, and UAVs were all directed towards the destroyers he believed were now trapped in Manila harbor.  The first inkling he had of the presence of the US cruisers was the sudden sprouting of enormous water columns as the initial 8” salvos arrived from about 20 miles away.
 
The Chinese group was now caught between the rapidly closing cruiser group to the south and the island to the north.  There was nowhere to run and any attempt to do so would only grant the US cruisers, with their longer ranged guns, a sustained range advantage.  The Chinese commander turned toward the cruisers, attempting to close to within gun range of his ship’s 130 mm guns.  Outranged and having expended all their anti-ship missiles in the failed attack on the Burkes, the Chinese ships were reduced to firing surface to air missiles in surface mode until they could close the range.
 
A few of the missiles got through the ship’s defenses but the cruiser’s extensive armor and redundant systems mitigated damage to little more than an annoyance.  The cruiser’s fire control sensors, in particular, were redundant several times over and the loss of an occasional sensor caused no problem.  The Chinese would get no easy mission kill by disabling the cruiser’s sensors.
 
As the opposing groups continued to close, the naval gun battle that the US Navy (and, to be fair, the rest of the world) believed could never occur, took place.  Each US cruiser was armed with three dual 8” gun mounts totaling 6 guns per ship.  Each cruiser, firing 10 rds per minute per gun, rained 60 shells per minute on its selected target.  Within minutes, 8” hits were carving out huge chunks from the thin-skinned Chinese destroyers.  The Chinese, firing at extreme range, registered hits but, as was the case with the missiles, the 5” shells did little significant damage to the heavily armored US ships.  In contrast, the Chinese ship’s unarmored 130 mm guns, protected only by thin weather shields, were quickly put out of action by simple shrapnel and the Chinese ships were rapidly rendered toothless.
 
The US destroyers, by remaining inside the harbor, eliminated the possibility of friendly fire concerns and the cruisers were free to fire at any target they could detect.  This kind of simple battle plan eliminated the otherwise certain confusion of identification in battle and ensured the cruiser’s maximum effectiveness.
 
By the time the cruisers closed to within a few miles, there was nothing left of the Chinese task force except a few burning, sinking hulks.
 
With the Chinese task force eliminated, the Burkes rejoined the cruisers and the task force began its main mission of shelling the various Chinese bases, weapons, and sensors in the area, to devastating effect.
 
Using numerous, small cruiser-launched UAVs for reconnaissance, the task force deliberately trolled for shots from the Chinese thereby enabling the cruiser’s counter-battery radars to pinpoint any sites that were previously unknown.  The sites, both artillery and missile, that attempted to fire on the task force were quickly silenced by the cruiser’s counter-battery capabilities which almost instantly dropped a rain of 8” shells on the offending sites. 
 
While the cruisers were kept busy methodically eliminating Chinese sites, the escorting Burke AAW destroyers provided a protective anti-missile umbrella for the group. 
 
For thirty hours, the group rampaged along the various coastlines, expending their nearly 1000 shells per cruiser and opening the southern flank for US forces to counterattack the Taiwan assault.


________________________

Disclaimer:  As always (and always ignored!), this is not a true combat simulation.  It is simply a more entertaining way to illustrate various points.
 
________________________ 
 
 
 
Points of discussion:
 
  • Depletion of cruise missile inventory in the first few weeks of war and the inability to replenish in any useful time frame is a vital aspect of any future war and one that is ignored by the Navy and overlooked by most analysts and yet will have profound impacts on strategy, operations, and tactics.  This story attempts to illustrate the issue and provide one consequence and adaptation.
  • Missile inventory loss due to sunken ships is another factor that is ignored by the Navy.  How many VLS cells should a ship have?  Where’s the balance between enough missiles for operations and too many, leading to inventory loss on sinking?  WWII ships were generally sunk with most of their shells unexpended in their magazines but the cost of replacement was low and the time required was short so the inventory loss due to sinking was acceptable.  Is that the case today?
  • In the story, guided gun rounds were ignored which, if they existed, would make the naval guns all that much more effective though at an increased cost.  Is guidance worth it?  We’ve seen we can’t maintain a sufficient guided missile inventory due to cost so why would we think we can maintain a sufficient guided, large caliber, naval shell production rate?  In the story, most rounds were expended against area targets which, again, leads one to question the value of guided rounds.  Guided shells specifically for anti-ship use might be warranted although one has to wonder what form of guidance would be practical during ship-to-ship combat?
  • The tactics presented in the story are a sharp departure from anything the Navy practices in its set-piece, worthless exercises.  We must begin exercising our tactical minds and expanding our tactical thinking.  Of course, this requires realistic exercises with free-thinking participants instead of exercises whose sole purpose is checking a box on a pre-deployment workup sheet or validating a pre-determined outcome and conclusion.

Sunday, May 21, 2023

Boston Class Missile Cruiser

We’ve been discussing guns versus missiles and concluded, unsurprisingly, that both are needed.  With that in mind, let’s recall a ship that pioneered the combined use of missiles and guns!
 
The Boston class missile cruiser (CAG-1) was originally a Baltimore class heavy cruiser (CA-68) built during WWII.  After the war, in the early 1950’s, Boston was converted to launch RIM-2 Terrier missiles by removing the aft 8” gun mount and adding two twin-arm Terrier missile launchers (144 missiles in 2x 72 missile magazines).

USS Boston, CAG-1

 
One of Boston's Two Terrier Launchers


Boston’s Stern Showing Both Missile Launchers

 
In its original configuration, Boston was well armed and armored.  From Wikipedia[1],
 
Armament
 
3x triple 8”/55-caliber guns
6x twin 5”/38-caliber guns
12x quad Bofors 40 mm guns
24x single Oerlikon 20 mm guns
 
Armor
           
Belt armor: 4–6 in (102–152 mm)
Deck: 2.5 in (64 mm)
Turrets: 1.5–8 in (38–203 mm)
Barbettes: 6.3 in (160 mm)
Conning tower: 6.5 in (165 mm)
Bulkheads: 6 in (152 mm)
 
 
Let’s now consider a modern cruiser built along those lines with the Terrier launchers being replaced by two VLS units, each perhaps 16-32 cells for a total of 32-64 missile cells (speculatively, 40 quad packed ESSM plus the remaining 22-54 cells filled with Tomahawk cruise missiles?).  With armor and two triple 8” mounts it would be a formidable ship, able to conduct anti-air, cruise missile strikes, and close range, heavy caliber gun strikes while its armor made it resistant (not immune) and resilient to combat damage.  It would be the best protected, toughest ship in the world!  It’s interesting that the original missile version of Boston had more nominal missiles than our hypothetical, modern version (144 vs. 64)
 
Boston was 673 ft long and around 15,000 tons displacement, nearly the same size as a Zumwalt.  Imagine if the Zumwalt had, instead, been built as a modern Boston heavy missile cruiser.  It would have been a much more combat-effective and useful vessel !
 
Oh, what could have been …
 
 
 
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[1]Wikipedia, “USS Boston (CA-69)”, retrieved 12-May-2023,
https://en.wikipedia.org/wiki/USS_Boston_(CA-69)

Monday, April 18, 2022

Slava/Moskva Sinking Lessons

Everyone is speculating and it’s topical so I guess I should address it …

 

The Russian cruiser Slava/Moskva sank recently while under tow for repairs due to a fire and ammunition explosion (confirmed by various Russian reports).  Reports vary whether the fire was caused by Ukraine missiles or some accidental mishap on board the ship.  As I’ve cautioned, drawing specific lessons from this conflict, where we have almost no reliable information, is a worse than pointless exercise.  However, regardless of the details, there are some general lessons and reminders we can take from this.

 

Slava Class Cruiser


Loss of Inventory – When the Moskva sank, it took its entire weapons inventory to the bottom with it.  This is, historically, exactly what happens when a ship sinks.  Very few ships are sunk with their weapon magazines depleted.  They’re almost invariably sunk with most of the weapons/munitions still aboard.  This should give pause to those who want to arm ships with 100, 200, 1000 VLS cells in a misguided notion that more is better.  This should, specifically, serve as a caution to the notion of arsenal ships. 

 

Even the Navy’s vision of the large unmanned surface vessel (LUSV) which is envisioned as remote weapons ‘barge’ has to be questioned especially since it is defenseless.  While the plans do not seem to call for ridiculous numbers of VLS cells, we simply cannot afford to put inventories of million or multi-million dollar missiles at risk on defenseless ships.

 

Obsolescence – The Moskva was a 1980’s era ship with 1960-70’s era sensors and weapon/sensor updates had been minimal, if any.  This is yet another example of, and argument against, ships with designed service lives over 15-20 years.  Upgrades rarely happen and, in the US Navy, the ships are retired early, anyway.  We need to save money on the initial design by foregoing ‘future proofing’ and, instead, just design for around a 15 year life so that our ships will always be new.  This bypasses both the maintenance issues – which the Navy is ignoring, anyway – and the obsolescence issue.

 

Escorts – High value ships need escorts and this incident dramatically reinforced that lesson.  To be fair, we don’t know what escorts, if any, the Moskva had but they clearly weren’t effective.  Ideally, the escorts provide layers of anti-air protection.  Worst case, it is the job of the escorts to take the hits instead of the high value ships.  Details are lacking but it appears that Moskva was lacking any kind of close, co-ordinated defensive escort.  Our peacetime practice of 2-3 escorts for a carrier is insanity and violates the ‘train like you fight, fight like you train’ wisdom.

 

There are reports that the Moskva may have been distracted by the presence of a Ukrainian UAV(s).  If true, this is yet another responsibility of the escorts.  Any UAV should have been shot down long before it became a concern of the Moskva.

 

Proximity to Land – It is a bit of a mystery why Moskva was, apparently, in close proximity to land, operating somewhere southeast of Odessa.  The ship has no dedicated land attack weapons.  The AK-130 (130 mm, 5.1”) gun is capable of providing limited fire support but there are no indications that’s what Moskva was doing.  It’s possible the ship was supporting an amphibious assault force.  Regardless, the closer to land, the greater the risk.  It requires a significant potential positive impact to risk a several billion dollar ship near land.  We need to carefully evaluate our [non-existent] CONOPS to see whether we can justify risking ships near land.  Alternatively, we need to stop the endless trend of ever more expensive and risk-averse ship construction and return to smaller, cheaper, single function ships that we are willing to risk near land.

 

Armor – No large ship should be sunk by one or two anti-ship missiles especially not something on the order of a Harpoon.  Armor may not totally stop an attacking weapon but it is guaranteed to reduce the damage done by depleting the kinetic energy (hence, depth of penetration) of the weapon and confining the explosion and damage to a more limited internal area.  All ships need internal and external armor, appropriate for their size and function.  This is not an option.  We cannot build multi-billion dollar ships and then leave them virtually unprotected.  The Burkes, for example, cost a couple billion dollars each and have one CIWS, no SeaRAM, and no armor.  They’re one-hit kills waiting to happen.

 

Damage Control – We have no information about the damage control circumstances other than the fact that the crew was evacuated early on.  This does, however, emphasize that damage control is vital.  Saving a badly damaged ship for eventual repair is still far cheaper and faster than having to build a several billion dollar replacement and needing several years to do it.  As has been demonstrated repeatedly throughout history, the number one factor in successful damage control is bodies … lots and lots of bodies to do the exhausting manual labor of damage control.  This is a lesson the Navy has long since abandoned and forgotten with their emphasis on business case inspired minimal manning.  Minimal manning will cost us ships in combat.  We not only need to drop the entire minimal manning concept idiocy, we need to go in the opposite direction and over-man ships with damage control and casualty attrition needs in mind.

 

 

Summary

 

These lessons and reminders are timeless and don’t really require the specifics of the Moskva incident to be seen or understood.  The incident merely serves as an illustration of the principles.  The US Navy has clearly forgotten most of what it ever knew about naval combat and perhaps this incident can serve to rekindle interest on the Navy’s part in understanding the lessons of naval combat.

 

The Navy has publicly stated that they expect war with China in the next 8 years.  We have got to start applying these lessons yesterday if we expect to successfully fight a naval war tomorrow.


Thursday, June 25, 2020

Des Moines Class Cruiser

Among those who study naval warfare, the WWII Des Moines class cruiser has taken on a bit of an almost legendary status despite not having actually fought in WWII.  It is frequently mentioned as the basis for a modern cruiser.  Why is that?  What was special about the design of the class?  Is it as special as some believe it to be?  Let’s take a look.

The Des Moines class cruiser was designed during the peak of WWII and incorporated all the lessons learned about naval combat to that point.  More importantly, it was designed by people who were actually fighting a naval war as opposed to the people designing ships today who have no first hand knowledge of combat and, seemingly, no awareness of history or history’s lessons about warship design.  The class can, in many ways, be considered the ultimate development of the cruiser.  As such, it would behoove us to examine the design and see what characteristics its designers focused on and why.  Presumably, we should be valuing the same characteristics in our designs today or, if not, we should have a very carefully thought out rationale as to why not along with supporting evidence and data to demonstrate why we believe that the lessons of actual naval combat no longer apply.

Des Moines Class Cruiser


While the design work began around July 1943 with final design characteristics approved in November 1943, the lead ship, Des Moines, was laid down in May 1945 and commissioned in November 1948, too late for the war.

As a brief summary, here are some specifications of the Des Moines class.


Des Moines Class Specifications (1)
Length (overall), ft
716
Displacement (full load), tons
20,950
Beam (waterline), ft
76
SHP, hp
120,000
Speed (trial), kts
32.5
Range @ 15 kts, nm
10,500
Main Battery
9x 8”/55 (3x triple mounts)
Secondary Battery
12x 5”/38 (6x dual mounts)
AA Battery
24x 3”/50, 12x 20mm
Fire Control
2x Mk54 (8”), 4x Mk37 (5”), 4x Mk56
Armor Belt, in
6-4
Bomb Deck, in
1
Armor Deck, in
3.5
Bulkheads, in
5
Barbettes, in
6.3
Main Mount Armor, in
up to 8
Conning Tower, in
up to 6.5



Let’s take a brief look at the design characteristics that are evident from the specifications.

Armor – With a 1” bomb deck (intended to detonate armor piercing shells and high explosive bombs before they reached the main armor deck), 3.5” armor deck, up to 6” main belt, and heavily armored main gun mounts, the class was well equipped to stand and fight and continue fighting while absorbing damage.  We’ve completely forgotten just how well armored ships used to be.  Imagine a Des Moines class cruiser going up against the 57-76 mm guns so prevalent in today’s navies.  The cruiser would be almost invulnerable to gunfire.  Even 5” gunfire effects would be greatly mitigated.  Of course, anti-ship cruise missiles are a different story, to some degree, and no one is suggesting an exact duplicate of WWII armoring schemes for modern ships (see, “Conceptual Armor For Modern Ships”).  However, the lesson that armor mitigates damage and allows ships to stay in the fight is a timeless reminder of the reality of combat and one that we have forgotten, today.  WWII warship designers understood this even though we’ve forgotten the lesson, today.

Speed/Range – Capable of 32+ knots and a range of 10,500 nm at 15 kts, the Des Moines was heavily armored for her size and reminds us that we don’t have to sacrifice speed or range to achieve armor.  Contrast this with the entirely unarmored LCS which is only capable of around 37 knots (see, “LCS – Not All That Fast”) – hardly much more than the Des Moines while being significantly lighter!  So many people have commented that armor means less speed and range.  They’re wrong and the Des Moines specifications prove it conclusively!  Modern ship designers have completely forgotten how to achieve the combination of speed, range, and armor that we routinely met in WWII ship designs.

Battery – The Des Moines carried a heavy and numerous main and secondary battery.  We’ve forgotten just how densely packed WWII ships were with weapons.  Weapon density (redundancy) is what allows a ship to keep fighting even if one or more weapons are disabled.  It is also worth noting the secondary battery which was numerous and powerful.  Compare that to today’s ‘secondary’ batteries – for those ships that even have one it generally consists of one or two 30 mm guns or some such.  This reminds us that there is value in a powerful secondary battery in the event that the main battery is disabled.  It also provides an alternative for situations in which firepower is still needed but the main battery would be a vast overkill.  The failure to recognize the value of a powerful secondary battery, today, is yet further proof that we no longer design WARships.

Fire Control Redundancy – One can’t help but be struck by the number and types of fire control systems in the Des Moines class.  In addition, and notably, the Des Moines had two separate main battery plotting rooms which would provide invaluable redundancy in combat.  Contrast that with today’s obsession with consolidating every sensor into one system which, of course, creates a single point of failure in combat.  As battle damage accumulates, the more fire control systems that are available, the longer a ship can stay in the fight.



All of the above characteristics are noteworthy, without a doubt, however, they don’t add up to a truly special warship.  So, is there something else that makes the Des Moines class special?  There is!  It’s the rapid fire 8” guns.

8”/55 RF Mk16 – This gun represented a major step forward with the capability to achieve firing rates three times faster than previous guns!  As reported by Navweaps website, the 8”/55 routinely demonstrated sustained firing rates of 10 rds/min thanks to automated shell handling and loading.  As Navweaps states,

… a fire rate three times greater than that of previous 8" (20.3 cm) guns and coupled together with the use of "super-heavy" AP projectiles, these weapons made the Des Moines (CA-134) class the most powerful heavy cruisers ever built. (2)

The guns were able to be loaded at any angle – again, a major benefit – and were able to achieve firing ranges of 30,000 yds (17 miles).  Interestingly, the guns used two radars on each turret for rangefinding instead of optical rangefinders.(2)


8"/55 Gun Turret Drawing



8"/55 Gun


We see, then, that the key to the Des Moines class was the very heavy weapons fit and the ability to fire those weapons three times faster than any previous 8” gun!  Combine this with a heavy armor fit and the Des Moines was a powerful, effective warship, for sure.  It is little wonder, then, that the Des Moines keeps cropping up in discussions about modern cruisers and why modern ships compare so poorly to the WWII class.

The lessons of the Des Moines and the characteristics that were valued by WWII warship designers were speed, range, firepower, redundancy, armor, and rate of fire – all of which, except perhaps speed, have been abandoned by today’s ship designers.  What makes us think that those characteristics of a good warship design no longer apply to naval combat?  What evidence do we have that those characteristics no longer confer any benefit in naval combat?  The answer is … nothing.  Only our own stupidity, ignorance, and arrogance are telling us to abandon the hard learned lessons of actual combat.  We’re substituting our ignorance-based thinking for combat-reality and the folly of that will quickly become apparent in the next naval battle.

Indeed, the folly has already become apparent with examples such as the Norwegian frigate that sank from a simple, limited collision, the gentle grounding of the Port Royal that mission killed the ship’s VLS and Aegis, the exterior bomb blast that almost sank the Cole, the two Burke collisions that almost sank those ships, the French ship that was unable to launch its cruise missiles, the LCS that cannot repair even the simplest damage at sea, and so on.  Today’s examples are telling us, loudly and clearly, that our ship designs are garbage and unsuited for combat.  We need to return to the Des Moines, conceptually, if not literally.

Imagine a Des Moines class cruiser with VLS and some modern sensors added.  It would instantly be the most powerful surface ship in the world.




___________________________________

(1)“U.S. Cruisers, An Illustrated Design History”, Norman Friedman, Naval Institute Press, 1984, ISBN 0-87021-718-6, p.481

(2)Navweaps website, retrieved 17-Jun-2020,
http://navweaps.com/Weapons/WNUS_8-55_mk16.php

Monday, April 6, 2020

Virginia Class Cruisers

For no particular reason, ComNavOps has always had a fondness for the Virginia class nuclear powered cruisers, believing them to be one of the most attractive looking ships of the modern era.  For nostalgia sake, let’s take a closer look at them.  The class consisted of four ships, as shown below.  Note the very short service lives.  The class was the victim of the Cold War ‘peace dividend’ as their mid-life refueling was considered too costly for the time period given the collapse of the Soviet Union.


Ship
Service Life, years
Virginia, CGN-38
18
Texas, CGN-39
16
Mississippi, CGN-40
19
Arkansas, CGN-41
18



Virginia Class - As Built


The ships were 586 ft long (about 20 ft longer than the Ticonderoga class cruisers) with 11,666 tons full displacement and a crew of 579.  Wiki reports the construction cost as $675M (1990) which is $1.3B (2020) today.  Interestingly, these ships were initially classified as frigates/destroyer leaders before ultimately being labeled cruisers.

The class underwent refits in the 1980’s which resulted in the elimination of the helo and hangar in favor of Tomahawk armored box launchers.  Other additions included CIWS and Harpoon launchers.

The post-refit weapons fit was respectable for the time:
  • 2 × Mk 26 missile launchers for 68 missiles (SM-1/2MR, ASROC)
  • 8 × Tomahawk missile in 2 armored-box launchers
  • 8 × RGM-84 Harpoon in 2 Mk-141 quad launchers
  • 6 × Mk 32 triple torpedoe launchers
  • 2 × Mk-45 5-inch/54 caliber rapid-fire gun
  • 2 × 20 mm Phalanx CIWS
  • 2 × 25 mm Mk 38 chain guns



Let’s take a closer look at some aspects of the class.


Mk26 Launcher.  The Virginias had 2x rapid fire Mk 26 twin arm missile launchers mounted fore and aft.  A pair of missiles (one on each arm) could be launched every 9 seconds.  Thus, the ship’s overall firing rate was 4 missiles every 9 seconds – a respectable rate and quite adequate for almost any scenario.  Given the Navy’s typical shoot-shoot-look engagement sequence, this rate of fire seems perfectly adequate.  Today’s VLS really offers little in the way of an effective enhanced firing rate.  What VLS offers is that every missile is available for use as opposed to having to be selected and loaded.

While the drawback of the twin arm launcher is that it has to point at the target and thus is limited to certain firing arcs, the benefit of the launcher is that it can point at the target and there is no delay as there is for a vertically launched missile to ‘tip over’ and acquire its target.  Thus, the twin arm launcher can put a missile at the target faster than a VLS, if the launcher is not masked by the ship’s superstructure.

It’s an article of faith, today, that VLS systems are vastly superior to twin armed launchers but the reality is that they’re not.  They have a few advantages but they also have drawbacks.




ASW.  The ships carried bow mounted SQS-53A sonars and, as originally constructed, a below deck hangar and elevator for one Kaman SH-2 Seasprite LAMPS helicopter.  The hangar proved problematic and the Navy was never able to achieve a watertight fit of the horizontal hatch covers.  The helo and hangar were eliminated in the 1980’s refits in favor of Tomahawk armored box launchers.  Hangar problems aside, the idea of fitting out major warships with ASW capability is highly suspect.  ASW is not the responsibility of a capital ship and no sane commander is going to risk such a ship playing tag with submarines.  In addition, the fact that the ship carried only a single helo meant that its ASW capability was not all that great to begin with.  Elimination of the helo/hangar was a good idea.  Interestingly, a proposal was made to install a vertical launch system for Tomahawks in the vacated hangar space, however, the idea was eventually dropped.

Armor.  The ships reportedly had 1 in (25 mm) Kevlar armor around the combat information center, magazines, and machinery spaces.  I don’t know the hull steel thickness and type.

Radar.  The ship’s main radars were the AN/SPS-48A 3-D air search radar and AN/SPS-40B 2-D air search radar which constituted a typical fit for the period.  These were mechanically steered, rotating units.  Given the maintenance and alignment problems with the Aegis SPY-x fixed planar arrays through the years, ComNavOps has often wondered if modernized versions of these units might not be combat-superior.  But, I digress …


Note Tomahawk Armored Box Launchers On Stern


Now, let’s do a bit of speculation, just for fun.


Nuclear Strike Group.  With the planned 11 ships of the class plus the two California class cruisers and the Truxtun, the Navy was on its way to assembling entire nuclear powered carrier strike groups.  This would have offered some significant operational and tactical advantages.  The group would have required no refueling support and could have operated at high speed for extended periods thereby allowing for rapid repositioning.  A highly mobile and self-sufficient task force would have been a significant benefit.

NTU.  The New Threat Upgrade would have made the Virginias quite formidable.  NTU, when it first came out, was superior to Aegis which would spend quite some time working out its bugs.  Of course, the Navy sank the entire Spruance class to avoid the Spruance-NTU fleet from threatening the Aegis funding.  A Virginia-NTU would have been the most capable AAW ship afloat.

One can only imagine the altered path of ship development if the Virginia-NTU and Spruance-NTU had come to pass.  It is likely that the compromised Ticonderoga class would never have come about and the Burkes might have, initially, been designed as stealth-NTU AAW ships to complement the Spruances instead of replace them.  This could have given us two focused ship classes: the ASW Spruances and the AAW Burkes instead of trying to make the Burkes a do-everything design.  The successor cruiser to the Virginias would probably have been a new design with more anti-surface capability than the Ticonderogas.

VLS Upgrade.  Had they continued to serve, the Virginias might have been upgraded to VLS at some point.  Given their size, it is likely they could have accommodated 128-160 VLS cells.  A truly powerful ship, indeed!


Note Harpoon Launchers In Front Of Superstructure


Summary

Aside from ComNavOps' personal affection for these ships, it is obvious that the Virginia class left a lot of untapped potential on the table when it was prematurely retired.  For all those naval observers and ship designers who constantly talk about extended ship service lives, this is yet another example of a prematurely retired ship class.  Premature retirement is the standard in the Navy, not the exception.  With this kind of history it is foolish to design for extended service lives.  As I’ve posted in the past, we should be designing for 15-20 year service lives because that’s all we typically get before we retire our ships.  All this planning for future growth is pure bilge droppings – it never happens!

The Virginias were wonderful ships and I wish they had been fully utilized by the Navy and had a longer service life for ComNavOps to enjoy and admire!

Monday, August 12, 2019

Roles - Cruiser

Continuing our ‘roles’ theme (see, Roles – Frigate), let’s now examine cruisers.  What’s a cruiser?  Well, one classic and pretty good definition is that it’s a ship that’s strong enough to defeat anything it can’t outrun and fast enough to outrun anything it can’t defeat.  This concept can be traced back to the frigates in the age of sail.  Despite their name, sailing frigates did not give rise to modern frigates.  Instead, they filled the role that eventually became the modern cruiser.

Sailing frigates acted as scouts for the main fleet or acted independently by providing a cheap, plentiful, and reasonably powerful presence intended to keep/enforce the peace, secure trade routes, provide security from pirates and opportunistic foreign ships, provide a means of communication (if not particularly rapid communications), escort convoys, and generally patrol an area while upholding and reinforcing the parent country’s territorial claims and interests.

The English Navy’s famed frigates and captains, such as HMS Indefatigable and Edward Pellew, set the standard that would, ultimately, lead to modern cruisers.



HMS Indefatigable


Similarly, the United States’ sailing ship USS Constitution might be considered a prototype cruiser.  It was well armed and strong enough to defeat all existing frigates and even some larger ships and fast enough to run from any ship of the line that it couldn’t defeat.

When the age of sail gave way to steam and steel, the vastness of oceans and empires gave rise to the first modern cruisers such as the USS Olympia, Commodore Dewey’s flagship at the Battle of Manila Bay during the Spanish American War.  In keeping with the sailing frigates, cruisers were seen as ocean-ranging commerce raiders, scouts, and, often, the backbone of small surface groups.  Cruisers often were designed with great speed to enable them to operate with destroyers and to cover large areas quickly in the scouting role.  For example, the American Chester class ‘scout cruiser’, built beginning in 1905, was designed with high speed but light armor and armament.  Thus, cruisers of this era were used as ubiquitous global ‘presence’ ships while the battle line generally stayed in home waters.



USS Olympia


The advent of aircraft further emphasized the cruiser’s role as a scout as the cruisers now had the means to greatly extend their ‘sensor’ range.  The Brooklyn class light cruiser of the mid-1930’s, for example, carried 4 floatplanes and 2 catapults.



USS Brooklyn CL-40


In more modern times, the definition of a cruiser was a ship that was bigger than a destroyer and smaller than a battleship.  This was more a description than a definition, however.  Still, prior to the advent of WWII, the scouting role was still emphasized and cruisers were often used as scouts for the battle line. 

WWII saw the development of a wide range of cruisers from light anti-aircraft cruisers such as the Atlanta class which was armed with 5” guns to the near-battleship Alaska class cruisers with a main battery of nine 12” guns and heavy armor.  The range of designs reflected the range of missions that cruisers were used for.  The missions included,
  • Scouting (early war)
  •  Anti-air escort
  •  Land bombardment
  •  Independent surface group core

Thus, the WWII cruiser was, in a sense, a ship type that didn’t have a clearly defined role.  As an overall group of ships, cruisers could be considered multi-function ships in an era of single function design.  However, on closer examination, the multiple functions were filled not by one design type but by several designs, each specialized and optimized for the intended role.  Thus, the Atlanta class anti-air cruiser had numerous 5” anti-air guns while the Alaska class heavy gun cruiser was optimized for anti-surface and land attack.  So, while the overall classification of cruiser performed many roles, the roles were actually filled by purpose designed, single function classes.



Atlanta Class Anti-Aircraft Cruiser


The last true US cruisers were the California and Virginia classes – ‘true’ in the sense that they had a nice balance of speed, firepower, size, flag facilities, and some armor.  Their replacement, the Ticonderoga class, which the Navy labeled a cruiser, was just a modification of the Spruance class destroyer intended to fill the anti-air role and had none of the physical or operational characteristics of a cruiser.

This brings us to consider the question, what is a modern cruiser and what is its role?

The modern cruiser is represented by the American Ticonderoga class, the Chinese Type 055, and the SKorean Sejong the Great.  The common attribute among these is that all are focused on anti-air warfare.  Thus, they are defensive escorts rather than the scouts or independent sailors of earlier times.


Sejong the Great Class


Further, the distinction between cruiser and destroyer has been so badly blurred that the designations are now meaningless.  The designation ‘cruiser’ is now bestowed, or not, on a ship class for reasons of prestige, public relations, Congressional oversight, etc. rather than because the ships meet any particular historical or functional definition of a cruiser.

We might almost go so far as to say that modern cruisers no longer exist in the sense that there are no ships that fill the traditional roles of a cruiser.  Aviation has taken over the scouting role, AAW-focused ‘destroyers’ have taken over the escort role, and there are no ships performing the independent operations role.

The Soviet Union Kirov class cruiser is an interesting case.  It came very close to the traditional attributes of fairly heavy firepower, moderate armor, decent speed, and high endurance.  In terms of roles, it was used for strike operations, scouting, in a sense (hunting US carriers), and independent surface operations as the core of a surface group.  On the other hand, by modern standards, the Kirovs were so far beyond other countries’ ‘cruisers’ that they could easily be classed as modern battleships, lacking only heavy armor.  It is also interesting that no country has attempted to build a vessel equivalent to the Kirov.


Kirov Class


As stated, from a functional aspect, cruisers no longer exist and current discussions about ‘cruisers’ are merely semantic debates.  Interestingly, though, this blog has called for true cruisers to fill the traditional roles and lend some much needed firepower and presence in an alternative form to carrier groups (see, “Independent Cruiser”).

Thus, the cruiser is no more.  Naval strategists have dropped all the traditional cruiser roles or distributed them out among other platforms.  This seems unwise as the need for an ocean-ranging presence (meaning with firepower) has never changed and, when we find that our vaunted UAVs are nowhere near the omniscient and invulnerable assets that we assume them to be, we may well regret the disappearance of a far ranging scout capable of defending itself.

The trans-oceanic presence role of a cruiser is worthy of some additional consideration.  Once upon a time, cruisers were invested with significant authority and power by their parent countries to enforce national intent.  It was expected that they would, occasionally, exert their influence (again, firepower) for the betterment of their country.  Ship Captains wielded great autonomy and power.  Today, we have removed all such authority and power from ship Captains and have adopted a policy of appeasement instead of enforcement and might.  That being the case, there is no need for a cruiser – some might say there is no need for a navy if appeasement is the policy.  However, history strongly suggests that these changes have led to a worsening of international behavior, not an improvement.  For example, we now have third rate countries dictating policy in the Middle East, seizing ships of all nations, threatening international shipping lanes, etc.  Once upon a time, such Barbary Pirate behavior was terminated by the actions of Decatur and Bainbridge and the young American Navy.  There is still a need for forceful presence around the world.  Of course, that requires a modicum of courage and resolve by our civilian leaders and a willingness to invest ship Captains with autonomy and authority.



Stephen Decatur


In short, while the world navies have abandoned cruisers, the traditional roles of the cruiser have not vanished which makes the abandonment all the more curious.  We could use a couple dozen modern cruisers far more than a couple dozen frigates.