Showing posts with label Convoy. Show all posts
Showing posts with label Convoy. Show all posts

Monday, July 13, 2026

Flower Class Corvette

The Flower class corvette was the epitome of a single purpose vessel (to be fair, most ships were in WWII).  It was designed and built to provide coastal convoy escort, specifically, anti-U-boat protection although it later proved adaptable to open ocean convoy escort thanks to its impressive range for its size.  While not designed or intended to hunt and kill U-boats, the class nevertheless managed to sink some fifty U-boats. 
 
 
Design Concept
 
It’s important to understand the ship’s intended role.  It was a convoy ASW escort.  Its responsibility was to deliver convoy ships not sink U-boats.  In other words, was designed to ensure that convoy ships arrived safely.  It was not designed to go hunt and kill U-boats.  The designers recognized that a mission kill, meaning forcing a U-boat to break off an attack, was just as good as a kill in that it delivered convoy ships safely to port.  Thus, the designers, wisely, didn’t try to load every known ASW weapon and sensor onto the ship.  That would have increased the size, cost, and complexity of the ship resulting in far fewer vessels being built which would have defeated the purpose of the class.  It is vitally important to recognize this concept:  greater individual ship capability would have negatively impacted the overarching goal of getting convoys safely to port.  We have completely lost sight of this balance between mission intent and individual ship design.  By insisting on building uber-capable Burkes (to the dubious extent that they still are) we’ve been forced to give up building true destroyers, frigates, and corvettes thus hurting our overall naval capability.
 


 
Another vital consideration for the designers was that trying to fit the ultimate, top-of-the-line ASW gear on every ship would have resulted in ASW equipment shortages for every other ship class.  In a time of war, resources (meaning weapons and sensors) are limited.  Maximum ASW fits for Flower class ships would have been a case of robbing Peter to pay Paul.  We have completely lost sight of this concept today.  By only building high end Burkes we have ensured that we will be unable to outfit any other ship type (of which we have none!) in a time of war.
 
 
Design Specifics
 
  • ASW fit sufficient for its task but no more than that which contributed to its affordability
  • Buildable at small shipyards
  • Affordable in large numbers (394 ships built)
  • Good range at 3,500 nm at its cruising speed of 12 kts;  compare to a Burke with a range of 4,400 nm at its cruising speed of 20 kts
  • Commercial machinery operable by reserve and merchant sailors
  • Sufficient speed (16 kts) for its purpose
  • Built to the minimum requirements not the maximum
 
What would a modern Flower class ship look like?  In other words, what would a modern, low end, affordable in numbers, minimally capable ASW corvette look like without advanced radars, high speed, helo hangar/flight deck, dozens of VLS, etc. look like?  Well, here’s a few characteristics:
 
  • Moderate stealth shaping (no exotic coatings)
  • 1x 76 mm Super Rapid STRALES/DART
  • 2x Mk32 Triple Torpedo Launchers
  • 2x RBU
  • VDS
  • Hull mounted, small, multi-frequency sonar
  • SQR-20 Multi-function towed array
  • Acoustic isolation
  • Low end radar
  • 18 kt top speed
  • 5,000 nm range
  • 1x CIWS/SeaRAM/RAM
 
Discussion
 
The Flower class was built not to kill submarines (though they managed to kill some fifty U-boats!) but to accomplish a mission which was the safe delivery of merchant ships to port and it filled that purpose admirably.  Given the mission, the designers recognized that a mission kill was just as good as an actual kill and cost a lot less money thus allowing the class to be built in large numbers across numerous yards.  The large numbers of vessels contributed to the mission success.  Mere presence achieved mission kills since submarines will go far out their way to avoid detection and this occurs whether the surface ship even knows the submarine is present or not.  In other words, presence equals mission kill which makes simple presence (numbers) a weapon in itself!  We need to re-learn those design lessons and re-embrace the low end, single purpose ship suitably updated and adapted to modern warfare. 

Monday, January 20, 2020

Pacific Reforger

As you know from your history, when the Soviet Union was a threat, one of the major challenges facing the US was the rapid reinforcement and resupply of forces in Europe.  The solution arrived at was a massive air and sea lift operation referred to as REFORGER.  Large annual exercises were conducted during the Cold War to ensure that we had and maintained that capability.  Of course, once the threat of the Soviet Union was gone, the need for REFORGER disappeared and the exercises were suspended.

Today, with the threat of China and the need to wage a war thousands of miles from the US mainland or any substantial US base, the challenge of reinforcing and resupplying Pacific forces exists.  The parallel between this Pacific resupply effort and the earlier REFORGER seems obvious. 

If anything, the Pacific resupply is a much bigger challenge than REFORGER.

Distance is one significant difference.  The REFORGER distance from, say, New York to Le Havre (France) is 3,520 miles.  By comparison, the distance from, say, San Diego to Guam is 6,183 miles.  Thus, a Pacific REFORGER has to travel around 2,500 more miles than the original REFORGER. 

Another difference is that convoys from the US to Europe had the entire continent to land at and had the support of multiple countries when they arrived.  The actual destination was well known.  A Pacific REFORGER will have very limited choices of landing locations and, currently, we don’t even know exactly where would need to provide resupply (will Guam even be functional after the start of a war?).  This makes pre-planning difficult, to say the least.

Despite the difficulty, we absolutely need to come to grips with the need for a Pacific REFORGER and begin planning and practicing for it.  The recent US Transportation Command logistics surge exercise was an eye opening disappointment and should serve to drive home the need for annual large scale resupply exercises to the Pacific.

On a closely related note, the US is planning to conduct a modern version of European resupply with Exercise Defender-Europe 20.  As explained on the US Army Europe website,

Exercise DEFENDER-Europe 20 is the deployment of a division-size combat-credible force from the United States to Europe, the drawing of equipment and the movement of personnel and equipment across the theater to various training areas.

U.S.-based equipment will leave from ports in four states and arrive in six European countries. This will require the support of tens of thousands of service members and civilians in multiple nations. 

DEFENDER-Europe 20 is the largest deployment of U.S.-based forces to Europe for an exercise in the more than 25 years. (1)

From the Defender-Europe 20 Fact Sheet: (1)

  • 20,000 U.S. service members from the continental U.S. deploying to Europe
  • 13,000 pieces of equipment drawn from the Army Prepositioned Stock
  • 9,000 U.S. service members based in Europe participating
  • 7,000 Army National Guard Soldiers from 12 states
  • 4,000 km traveled across 12 convoy routes
  • 750 U.S. Army Reserve Soldiers participating 

Interestingly, the Army also plans to conduct what appears to be a greatly scaled down version of Defender-Europe 20 for the Pacific, Defender–Pacific 20. (2)

… U.S. Army … is aiming to practice rapid deployment from the continental United States to the Pacific.

The plan is to bring over a division headquarters and several brigades over the course of a 30- to 45-day period along with their enablers … (2)

The time period is extended and there is no mention of any large scale movement of equipment.  There is also no suggestion that the movement would be conducted via convoys as would occur in a real war.  The wording hints that the movement would be a ‘peacetime’ transportation exercise using leased commercial flights although this remains to be seen.

As we noted, a resupply effort for the Pacific has the paramount question of where to send the supplies.  The Army has this to say on the subject,

The exercise will consist of many things the Army has not practiced at such a large scale, Brown [Gen. Robert Brown, the commander of U.S. Army Pacific] said. Forces will be in countries like the Philippines and Thailand, and they will likely work with other countries like Malaysia, Indonesia and Brunei. (2)

The problem with this is the obvious question of whether practicing delivering and dispersing forces throughout the region is really reflective of a what a realistic strategy would be.  A very good argument could be made that doing so would simply be setting forces up for isolation and defeat in detail.  It is also quite debatable whether any of the proffered sites would actually be politically available to the US in a war with China.  It is quite possible (maybe even likely) that the mentioned countries would attempt to remain neutral in a war and would refuse to allow US use of their territory.  That being the case, why would we practice something that might not (likely would not) be possible in a real war?

While the difficulties are obvious (choosing deliver sites, for example), we should embrace the challenge and begin planning and exercising realistic wartime resupply movements.  These exercises should include convoy defense against subs, aircraft, missiles, and surface ships as well as convoy defense at the delivery sites as they may well be in range of enemy attack.

We have got to start losing our peacetime mentality and begin embracing full scale, peer war.  As we’ve noted several times in past posts, it is discouraging that the Army is the only service that seems to be starting to face up to the prospect of peer war.  There is much work to do to prepare for possible war with China and the Navy is far behind the curve.  The Navy needs to wake up and get ready.




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