The 87 foot WPB Replacement, an Addendum

The discussion on earlier posts, “The 87 Foot WPB Replacement –Response Boat, Large –Interceptor” and “57mm ALaMO Round” has prompted some additional thoughts that seem to require more than a comment, mostly regarding the 57mm Mk110 and its new ALaMO guided projectile.

I also had intended to mention the fact that, if the WPB replacement included provision for stern launch of an 8 meter over-the-horizon boat, as was done with the Webber class FRC, then any mission modules that might developed for the Webber class to take the place of the boat, as discussed in the post, “Webber class Could be the Navy’s Light Duty Pickup Truck,” would probably also be apply to the WPB replacement. These might include anti-ship cruise missiles, Unmanned systems, or small towed array sonar systems

While the Iran swarming boat attacks are the normal justification for developing the ALaMO round, the emerging threat, unmanned surface vessels (USV) used to make “suicide” attacks may have also been a consideration. As can be seen above, small fast unmanned surface vessels can be hard to kill, and they have proven an effective weapon as can be seen below. One method of attempting to deal with the swarming boat threat has been to have the projectile burst above the boat, showering it with shrapnel. These airbursts could work pretty well against manned boats by killing the exposed boat operators, but the technique is less effective against unmanned craft. It may even be possible to shield critical components of unmanned craft against the effects of shrapnel. This is also a threat the Coast Guard may want to consider since unmanned explosive motor boats are relatively easy to construct.

Video: Houthi attack on Saudi Al Madinah-class frigate using unmanned explosive motor boat. 

The new ALaMO projectile may have been developed with this Unmanned Surface Vessel (USV) threat in mind. This suggest to me that the projectile would be designed to home on the heat generated by the craft’s engine. This would work equally well against manned craft. If the ALaMO round is IR homing, then perhaps it would also home on the heat of a larger vessel’s engines as well, making it more useful for countering larger vessels. 

If the 57mm Mk110 gun’s projectiles have made it a reliable counter to small, fast, highly maneuverable threats and perhaps some midsized threats, and if it can discriminate between its intended target and other traffic that may be in the area, it may be worthwhile to consider its inclusion in the WPB replacement. I still do not see it capable of countering large or even many medium sized threats. I still think we need to know more about how the round works before we can assume this is correct, but assuming it is correct, can we put this weapon on a vessel this small? I think we can.

This brought to mind how some earlier craft that had had relatively large guns. I will discuss some of the them and point out what I believe were notable features.

Spica Class (Sweden):

Swedish Torpedo Boat T121 “Spica” Photo by Pressbild. “Tidskrift i Sjöväsendet”. 1966. November. Sid 595. Swedish and US public domain

If you look at the Spica class above, it is a bigger than the likely WPB replacement (139 ft loa and 235 tons full load, 40 knots, 12,750 HP). It is 2/3 the size of the FRC, and about 29% more than my assumed maximum (182 tons) for the WPB replacement. It was a steel ship. It was equipped with an earlier version of the same 57mm gun found on the National Security Cutter (NSC) as well as the 9LV combat system which was the basis for the Mk92 Firecontrol system used on the 378 FRAM, and six heavy weight torpedo Tubes. The Torpedoes each weighed approximately 1800 kilos or about two tons, while the gun weighted about seven tons, so the vessel had over 19 tons of weapons. The fire control,  ammunition, launchers, and Electronic Warfare equipment would have added to the payload weight. By comparison, if our WPB included the current model 57mm (16,535 lbs/7,500 kg), two Mk54 torpedoes (608 lbs/276 kg each), and eight Longbow Hellfire (108 lbs/49 kg) the total weight of weapons would only be a little over nine tons (18,615 lb/ about 8,461 kg) plus ammunition, launchers, Electronic Warfare equipment, and firecontrol systems. The Over-the-Horizon boat, a primary “weapon,” may add as much as four tons, so the full “weapons load” would be about 13 tons. (I could not find a weight for the Over-the-Horizon boat, but the larger Response Boat, Small weighs a bit over 8 tons.) That is about 68.4% of the weight of systems on the Spica. It is not a complete accounting, but I think it is indicative and I will continue to use this format below.

One thing I liked about this, and the next two designs, is that the bridge and operations rooms are located at or near the center of pitch (which seems to have been done with the FRC as well). This makes it more comfortable for the watch. It also results in a long foc’sle. This allows the gun to be well back from the bow while still being far enough forward of the superstructure to allow a wide arc of fire. That is, it is capable of firing well abaft the beam.

The Norrkoping Class (Sweden):

Swedish Norrköping class fast attack craft (missile and torpedo) HMS Ystad R142, 3 September 2010 Photo by Reedhawk

The Norrkoping class was derived from the Spica class and sometimes referred to as the Spica II class. It gained a little weight, being 143 ft loa and 255 tons (41 knots, 12,750 HP). Initially it was armed like the Spica class, but subsequently the four of the torpedo tubes aft of the superstructure were replaced by four RBS-15 missiles. These weigh in at about 800 kg or 1760 lb. Consequently the weapons load is almost a ton lighter than that of the Spica, but still over 18 tons plus ammunition, launchers, Electronic Warfare equipment, and firecontrol systems. At the same time the missiles were installed, the 9LV system’s radar was replaced by the Sea Giraffe which is the radar installed on the Independence class LCS and planned for the Offshore Patrol Cutter (OPC), US designation AN/SPS 77 V(1). This radar is also used on the Swedish Visby class corvettes completed 2002 to 2015. 

Willemoes Class (Denmark):

A danish navy Willemoes-class fast attack craft (missile + torpedoes) HDMS Sehested (P547) as a museum ship at the Holmen naval base. Photo by Flemming Sørensen

The Willemoes class were similar, slightly larger vessels (46 m/150 ft 11 in loa and 260 tons full load, 40 knots, 12,750 HP). Originally they were equipped with four torpedo tubes in addition to the Oto Melara 76mm gun. The after pair of torpedo tubes was replaced by launchers for eight Harpoon Anti-Ship missiles (1,523 lb / 691 kg with booster). Its weight of weapons after installation of the Harpoons was just over 15 tons, plus ammunition, launchers, Electronic Warfare equipment, and firecontrol system (also a 9LV).

The unique feature of this class was that they had small diesel engines for cruising at up to 12 knots.

The Storm Class (Norway:

The Storm Class, (120 ft loa, 138 tons, 30 knots, 7200 HP) is illustrated above, fully armed and launching a Penguin missile, and below in a later configuration after removal of missiles and transfer from the Norwegian Navy to Lithuania. It is considerably smaller than the vessels above, at the lower end of what I expect the WPB replacement to displace, but still capable of mounting considerable weaponry, in this case six Penguin anti-ship missiles, and 76 and 40 mm guns. The missiles weighed 385 kg (849 lb). The 40 mm weighed about 3.5 tons. I was unable to find the weight of this 76mm gun. It would not have weighed as much as the Oto Melara, but it has to be at least 6 tons, so a total weapons weight was at least 12 tons.

Lithuanian Naval Force, Norwegian built, Storm class patrol boat P33 “Skalvis”. Missiles removed. Photo by Ministry of National Defence Republic of Lithuania

Conclusion:

If we chose to do so, it appears we could build something like a slightly scaled down version of the Spica that could mount a 57mm Mk110 forward and still provide an 8 meter Over-the-Horizon boat aft. The firecontrol could be as simple as the electro-optic unit from the Mk38 Mod2 or as capable as the SeaGiraffe which would give us a true all weather capability. In addition, it could probably mount tubes for two light weight torpedoes and eight Longbow Hellfire in vertical launchers. (I would think the Hellfires offset to one side, at the back of the superstructure. Foot print for a 2×4 cluster of missiles would likely be only about 4 x 3 feet.) I know the torpedoes are an unconventional approach, but it seems the surest way to stop a large ship and supposedly the Mk46 Mod5 and later torpedoes have an anti-surface capablity.

Replacing the Marine Protector class WPBs with vessels equipped like this would give the Coast Guard a robust and truly capable Ports, Waterways, and Coastal Security capability.

 

 

China Developing Containerized Cruise Missile Launchers

Above: Marketing video for comparable Russian system

The Washington Free Beacon is reporting that China is developing containerized cruise missiles launch systems for a land attack version of its 290 mile range YJ-18 anti-ship cruise missile which is a reverse engineered version of the Russian Klub-K cruise missile.

“China is building a long-range cruise missile fired from a shipping container that could turn Beijing’s large fleet of freighters into potential warships and commercial ports into future missile bases.”


“China operates or is building deep water ports in several strategic locations, including Bahamas, Panama, and Jamaica that could be used covertly to deploy ships carrying the YJ-18C.”

The Washington Free Beason may not be the gold standard in reporting, but I would have been surprised if the Chinese were not developing such systems. The Russians have been marketing such systems for about a decade. The Israelis have launched semi-ballistic missiles from a merchant ship and are marketing such a system.

In China, every enterprise is ultimately an arm of the State, ready to do the States bidding. We have seen their fishing fleet serve as a naval militia, it is likely their merchant marine would also serve military purposes beyond simply carrying cargo. In fact they have announced that that is their intent.

 

Surface Navy Association 2019 –Virtual Attendance

Like many of you, I was unable to attend the Surface Navy Association Conference, but I did find a number of videos which may provide some of the information that would have been available there. The Coast Guard Commandant had been scheduled to speak but cancelled, apparently in response to the partial government shutdown.

I have provided three videos, each about ten minutes, that may be of general interest, and links to four others, typically 20-25 minutes. The descriptions are from their respective YouTube pages.

The second and third videos have specific Coast Guard content, which I have identified by bold typeface with the beginning time in parenthesis. Some of the other equipment may have Coast Guard applications in the future.

Day 1 video coverage at SNA 2019, the Surface Navy Association’s national symposium. In this video we cover:
– Austal latest frigate design for FFG(X)
– Raytheon DART Variable Depth Sonar (VDS)
– Raytheon / Kongsberg Naval Strike Missile (NSM)
– Lockheed Martin Long Range Anti Ship Missile (LRASM)

Day 2 video coverage at SNA 2019, the Surface Navy Association’s national symposium.
In this video we cover:
– Fincantieri Marine Group FREMM frigate design for FFG(X)
– General Dynamics NASSCO John Lewis-class T-AO (New Oiler)
– Raytheon SM-2 restart
– Raytheon SM-3
– Leonardo DRS Hybrid Electric Drive for U.S. Coast Guard’s Offshore Patrol Cutter (OPC) (time 11:10)

Day 3 video coverage at SNA 2019, the Surface Navy Association’s national symposium. In this video we cover:
– Atlas North America’s solutions for mine counter measures, harbor security and unmanned surface vessels
– Lockheed Martin Canadian Surface Combatant (Type 26 Frigate, Canada’s Combat Ship Team)
Insitu ScanEagle and Integrator UAS (time 4:30)
– Raytheon SPY-6 and EASR radar programs

NAVSEA’s Moore on Improving Ship Repair, McCain & Fitzgerald, Ford, LCS

Vice Adm. Tom Moore, USN, the commander of the Naval Sea Systems Command, discusses US Navy efforts to increase public and private ship repair capabilities, lessons learned from repairing USS John S. McCain and Fitzgerald, the new Ford-class aircraft carrier, getting the Littoral Combat Ship on regular deployments and more with Defense & Aerospace Report Editor Vago Muradian at the Surface Navy Association annual conference and tradeshow in Northern Virginia.

GE Marine’s Awiszus on LM2500 Engine Outlook, Future Shipboard Power

George Awiszus, military marketing director of GE Marine, discusses the outlook for the company’s LM2500 engine that drives warships in more than 30 nations and the future of shipboard power with Defense & Aerospace Report Editor Vago Muradian at the Surface Navy Association’s annual conference and tradeshow in Northern Virginia.

US Navy’s Moran on Improving the Surface Force, Culture, Ship Repair & Information Sharing

Adm. Bill Moran, USN, the vice chief of naval operations, discusses dialogue with China, improving the surface force in the wake of 2017’s deadly accidents, refining Navy culture, increasing ship repair capabilities, harnessing data, improving information sharing across the force and the new Design for Seapower 2.0 with Defense & Aerospace Report Editor Vago Muradian at the Surface Navy Association’s annual conference and tradeshow in Northern Virginia.

US Navy’s Coffman on New Expeditionary Warfighting Concepts, Organizations, Unmanned Ships

Maj. Gen. David “Stretch” Coffman, USMC, the US Navy’s director of expeditionary warfare (N95), discusses new expeditionary warfighting concepts, the recent deployment of Littoral Combat Group 1 — composed of USS Wayne E Meyer (DDG-108) and USS Somerset (LPD-25) — to South America, new formations to replace the current Amphibious Ready Group and Marine Expeditionary Unit, unmanned ships, the performance of the F-35B Lightning II and more with Defense & Aerospace Report Editor Vago Muradian.

Fletcher/APKWS, a Pocket Missile System, Made in America

Fletcher Launcher for Advanced Precision Kill Weapon System (APKWS)–Arnold Defense showcased its new rocket launcher for non-air applications at SOFEX 2018 on an Oshkosh S-ATV. (Jen Judson/Staff)

Defense News brings us another report of the new four round surface launch system for the BAE Advanced Precision Kill Weapon System (APKWS) made by Arnold Defense of St. Louis, MO.

I did a post on this system earlier, Guided Weapons Made Easy, but I had almost forgotten about it, and that would be a shame, because this may be exactly what we need give our small units both precision and a much heavier punch.

APKWS is an upgrade to the long serving (and very numerous) 70 mm Hydra rocket, that adds passive laser homing. Reportedly BAE is working up to providing 20,000 APKWS kits a year.

Current range for this system is about eight kilometer, probably enough for us, but there is also mention of an improved motor to extend the range. Reportedly the seeker is good for up to 14 km, so a motor upgrade might push the range out that far.

The launcher seems to have similar footprint to a .50 caliber machine gun. The empty launcher weighs only 30 pounds and the individual missiles 32 pounds. If it can fit on a light land vehicle, its likely it will fit on many of the Coast Guard’s smaller patrol assets.

 

From the LCS Mission Modules, What We Might Want, What We Might Need

The US Naval Institute News Service has provided access to the second “Annual Report to Congress for the Littoral Combat Ship (LCS) Mission Module Program.” Some of these systems should be of interest to the Coast Guard, either as regular equipment for peacetime law enforcement and counterterrorism missions, for temporary use, as in the case of a naval mining incident, or as wartime add-ons if the Coast Guard is mobilized for a major conflict.

Keep in mind, the procurement cost of these systems would presumably come out the Navy budget.

Mine Countermeasures Mission Package

The Mine Countermeasures (MCM) Mission Packages (MP) has already been addressed. 24 are planned including nine to be built for “Vessels of Opportunity.” These nine extra packages probably meet any peacetime augmentation requirement and provide a reserve for mobilization. Testing is expected to continue through FY 2022. Production is expected to continue well into the future as less than half the packages will have been delivered by FY2023.

ASW Mission Packages for NSCs and OPCs

An earlier post discussed the possibility of using mission modules and Navy reservist to augment large cutters. In a protracted conflict against a near peer naval power like Russia or China, our large patrol ships are most probably going to be needed to perform open ocean ASW escort duties.

Only ten ASW Mission Packages are planned. Initial Operational Capability (IOC) is expected in FY 2019, but testing will continue through 2020. The Multi-Function Array is already a fielded system. Deliveries are expected to begin in FY2021 at a rate of two systems per year. If that rate is continued, the ten planned systems will be complete in 2025.

At an estimated cost of less than $20M the ASW Mission Package is the least expensive of the three types of Mission Packages. Adding this system as a mobilization capability or perhaps even as a peacetime capability to 35 or more large cutters would provide a higher return on investment than just about any other Naval program.

It might even help us locate semi-submersibles.

Vertical launch Hellfire

As I have noted before, the Coast Guard has a potential need to be capable of countering terrorist efforts to use a wide spectrum of vessels to make an attack. These craft range between small, fast, highly maneuverable boats on one extreme, to large ocean going vessels at the other. Our ability to counter these threats must be widely available, quickly effective, and have both a probability of success approaching 100% and do so with minimal danger to innocents who may be in the vicinity. Guns do not meet these criteria.

Hellfire missile have the potential to meet these criteria, at least against the lower half of the threat spectrum, and, using more than one round, might have a degree of success even against the largest vessels.

Apparently the SSMM Longbow Hellfire testing is going well, with 20 out of 24 successful engagements, and there’s a software fix for the root cause of the 4 failures.

ATLANTIC OCEAN—A Longbow Hellfire Missile is fired from Littoral Combat Ship USS Detroit (LCS 7) on Feb. 28, 2017 as part of a structural test firing of the Surface to Surface Missile Module (SSMM). The test marked the first vertical missile launched from an LCS and the first launch of a missile from the SSMM from an LCS. (Photo by U.S. Navy)

A recent US Naval Institute News Service report quoted LCS Mission Modules Program Manager Capt. Ted Zobel “all of our mission packages…are finishing up development, proceeding into test, and then from test into production and ultimately deployment.”

“…surface-to-surface missile module (SSMM) will add a Longbow Hellfire missile to increase the lethality of the LCS. Testing begins this month on USS Milwaukee (LCS-5) and will move to USS Detroit (LCS-7) over the summer. Testing should wrap up by December, Zobel said, with Detroit planning to bring the SSMM with it on its maiden deployment about a year from now. Written testimony from the Navy at a March 6 House Armed Services Committee hearing states that IOC is planned for Fiscal Year 2019.”

The Surface to Surface Mission Module (SSMM) planned for the Littoral Combat Ship, seen above, can store and launch up to 24 missiles. 24 missiles would weigh about 2,500 pounds. As a very rough estimate, Its foot print appears to be about 9×12 feet (late note–a little photo analysis suggest the three mission module positions on each LCS are about 15-16′ square), probably not too large for an NSC, OPC, or icebreaker, but probably too large for the Webber class WPCs where I really think we really need the capability. They are after all, much more likely to be in the right place, at the right time. For them we probably need a smaller system.

In the video above, beginning at time 2m58s there is a model of a 12 meter unmanned surface vessel mounting a four tube Hellfire vertical launch system. Knowing that the Hellfire is only 7 inches in diameter and 64 inches long, it appears this installation would have a footprint of no more than 6×8 feet and probably would be no more than seven feet high. It seems likely we could find a place for one or two of these on each Webber class and at least one when we build the replacements for the 87 footers.

I have often seen missiles compared unfavorably to guns, based on the cost of the projectiles, but cost of providing a system like Hellfire pales in comparison to the cost of a medium caliber gun, its ammunition allowance, and the maintenance, training, and technicians required to keep it operational. Compared to the guns we have used in the past:

  • Maximum range of almost 9,000 yards is less than the maximum range of the 5″/38, 76mm, or 57mm, but it is very near the effective range of these medium caliber weapons. This range is likely more than enough to remain outside the effective range of improvised weapons installations that might be used in a terrorist attack.
  • Effective range is more than three times greater than that of the 25mm Mk38 mod2/3
  • Warhead appears to be more effective than even the 5″ rounds.
  • Every round will likely be a hit.
  • Those hits will come very quickly.
  • It may be possible to accurately target specific vulnerable areas on the target.
  • They require only minimal training and maintenance compared to medium caliber guns.
  • If the target is within range, its only real disadvantage is the limited number of rounds.

While I have never seen it claimed official, I have seen reports that Hellfire can be used against slower aircraft such as helicopters and UAVs.

 These small missiles could allow our patrol vessels to hit like much bigger vessels.

30 mm Mk46 Gun Mission Module (GMM)

Gun Mission Module by Northrop Grumman

The “Gun Mission Module” (GMM) could be one way to arm the icebreakers relatively quickly when needed, while allowing the option of removing the weapons before going to Antarctica if desired.

Production of these units is quickly running its course, and if we want to use these on the icebreakers, it may be desirable to have our needs added to the production schedule before the production is shut down. The last two are expected to be delivered in FY2020.

How important this is will depend on the Coast Guard’s intentions and the alternatives.

Setting up the installations in the same format as found on the LCSs means improvements or alternative systems developed to LCS systems could be easily incorporated in the icebreakers as well.

On the other hand, the included 30mm Mk46 gun weapon system is not limited to the LCSs. It is or will be mounted on the three Zumwalt DDG-1000 class destroyers, 13 San Antonio (LPD-17) class, and probably 13 LX(R)/LPD-17 Flight II class still to be built, about 58 mounts in addition to the 20 planned for the LCSs.

It doesn’t look like it would be too difficult to remove or re-install just the gun mount (seen below) if that would meet our needs. It would of course require a dedicated space, permanent installation of supporting equipment, and a way to seal the opening for the mount long term when the mount is removed.

Although it is not as effective as the Mk46 mount, because of the smaller 25 mm gun currently used, the Mk38 Mod2/3 is also an alternative, and has the advantage of already being in the use with the Coast Guard. It is even more widely used, “As of 2016, 307 MK 38 MOD 2 systems have been delivered. There are 50 MK 38 MOD 3s on contract. The total POR (program of record–Chuck) is for 517 systems.”

Still the 25mm gun is markedly inferior to the 30mm in that its effective range is considerably less and the individual projectiles are far less potent. The Mk46 mount also has many more rounds on the mount compared to the Mk38 mod2/3. Upgrading the Mk38s to mount 30mm guns would address much of the current inferiority.

The inferiority of the Mk38 would also be much less of a concern if the Icebreaker had an additional, more powerful anti-surface weapon system, like the Hellfire Surface to Surface Missile Module or Anti-Surface Cruise Missiles. These might be useful if it is ever necessary to provide Naval Surface Fire Support (NSFS) in the Arctic or Antarctic.

“Restructure the Coast Guard Reserves into Support Roles”–USNI

The US Naval Institute Blog has a post recommending a restructuring of the Coast Guard Reserve, written by LCdr. Daniel L. Tavenier, USCG. His opening paragraph,

The time has come to examine and consider restructuring the role of Coast Guard Reserves within the service. Currently, there is not enough time for reservists to adequately serve operational roles unless they were active duty for at least two years following accession. Reservists have brought much to the table as far as their civilian skill sets and experience go, but we cannot pretend they are able to achieve proficiency in certifications to the level of an active duty member. There has been a role for reservists to operate, but history has proven those instances are few and far between. As budgets shrink, the entire reserve program needs to be significantly modernized. This includes expanding the maritime security and safety teams (MSSTs) role to cover overseas missions and decommissioning port security units (PSU) that are staffed with 130 reserves and only six active duty members. PSU staffing models are not set up to meet the high-level, tactical certifications required for outside continental U.S. (OCONUS) operations. MSSTs have undoubtedly filled overseas duties at much less expenditure.”

Along the way he also recommends that we “Ditch the MAW” (Mounted Automatic Weapon), i.e., remove the M-240 machinegun from the small boats that do Ports, Waterways, and Coastal Security (PWCS).

This is way outside my wheelhouse, so I am going to leave evaluation and comments to the readers. If you have strong feelings about this, you might want to comment on the original USNI blog post. Duplicate comments are of course also welcomed here.

Was Libya’s Sinking of a Tanker “Fake News?”

I have begun to suspect that the report of the Libyan Coast Guard sinking the Tanker GOEAST may have been more propaganda than reality.

Compare the Libyan video above with the video of USCGC ANACAPA sinking a much smaller derelict Japanese fishing vessel Ryou-Un Maru.

The Tanker was probably 20 times as large as the fishing vessel and had a crew on board and operating pumps to address flooding. USCGC ANACAPA began the operation at 13:00 and the RYOU-UN MARU sank at 18:15. It appears that the F/V may have been hit 100 times by 25mm projectiles, and at one point the ANACAPA used a hose to pour water into the fishing vessel.

.

On the video, the Libyan patrol boat fires no more than 20 rounds from its 30mm and I believe it was less than 15. At no time was there sustained fire directed at the tanker. The longest burst was perhaps four rounds.

At the end of the video, the tanker is pumping water, but it is also upright with no significant list and it appears to be making way. I am positive the tanker is underway at least as late as five minutes into the five minute 44 second video.

Perhaps things happened later, but if they recorded the opening shots, it seems they would have recorded the sinking.

This might have been an attempt at deception by the Libyans to discourage smuggling.

It might have been that the patrol boat skipper had been instructed to sink the tanker, and when he failed, he lied about the result of the attack.

It may be that a government information officer simply assumed that because they fired at the ship, that it was sunk. Capsized and sunk does make a much better story than shot at, was annoyed, and sailed away.

It is not impossible the entire thing was theater staged with the cooperation of the tanker, although I think that very unlikely.

Certainly the tanker’s owners may have reasons not to debunk the story.

  • They don’t want to confirm they were smuggling.
  • The report may discourage competing smuggling organizations.
  • They may even rename and reflag the tanker and file a bogus insurance claim.

Certainly, there was nothing in the video to indicate that this ship was sunk.

A final note. The patrol boat is seen firing into both sides of the tanker. If you want to sink a ship, it is usually better to concentrate as much damage as possible on one side. It is more likely to make the ship list and ultimately capsize. As the list increases holes initially made above water start to submerge and take on water.