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

 
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.