Category Archives: weapons

Air blast injuries likely killed the crew of the Hunley

The mystery of the Hunley‘s last crew has been solved. A paper by University of Florida researchers supported by the US Army MURI program and others has come to the conclusion, after repeatedly setting blasts near a scale model of the human-powered submersible, that the crew was killed by the blast wave from their torpedo, crushing their lungs and giving them TBIs. That explains why they were all found at their stations, with no broken bones, and the submarine was relatively intact.

Abstract:

The Hunley set off a 61.2 kg (135 lb) black powder torpedo at a distance less than 5 m (16 ft) off its bow. Scaled experiments were performed that measured black powder and shock tube explosions underwater and propagation of blasts through a model ship hull. This propagation data was used in combination with archival experimental data to evaluate the risk to the crew from their own torpedo. The blast produced likely caused flexion of the ship hull to transmit the blast wave; the secondary wave transmitted inside the crew compartment was of sufficient magnitude that the calculated chances of survival were less than 16% for each crew member. The submarine drifted to its resting place after the crew died of air blast trauma within the hull.

Full study here

Navy lets LCS sling a Harpoon, now with Fire Scout!

When envisioned back in the day, the Littoral Combat Ship idea, in its earliest “Streetfighter” concept, was a low-cost swarm of vessels capable of operating in shallow nearshore environments with a small crew and a small footprint. One of the big deals about these was the ability to “own” the area around them with anti-ship missiles. Park an LCS offshore, just over the horizon and away from the local warlord’s optically sighted anti-tank missiles, mortar and tube artillery on the beach, and it could run roughshod on the sea lanes. The thing is, LCS hasn’t had any anti-ship missiles so it couldn’t control anything beyond the under 9-mile reliable engagement distance of its 57mm popgun.

Well, with USS Coronado (LCS-4) at least the Navy has been working to fix that. She deployed last year with a single Harpoon and fired it (semi-successful) during RIMPAC 2016.

Now, it looks as if Coronado made good, hitting a surface target on 22 August with a little help from her embarked MQ-8B Fire Scout unmanned aerial system and MH-60S Seahawk helicopter. Also, in the below cleared image, she is carrying a four-pack of Harpoons, whereas last summer she only had one missile.

170822-N-GR361-082 PHILIPPINE SEA (Aug. 22, 2017) A harpoon missile launches from the missile deck of the littoral combat ship USS Coronado (LCS 4) off the coast of Guam. Coronado is on a rotational deployment in the U.S. 7th Fleet area of operations, patrolling the region’s littorals and working hull-to-hull with partner navies to provide the U.S. 7th Fleet with the flexible capabilities it needs now and in the future. (U.S. Navy photo by Mass Communication Specialist 2nd Class Kaleb R. Staples/Released)

From the Navy’s presser:

“LCS will play an important role in protecting shipping and vital U.S. interests in the maritime crossroads,” said Rear Adm. Don Gabrielson, commander, Task Force 73. “Its ability to pair unmanned vehicles like Fire Scout with Harpoon missiles to strike from the littoral shadows matters – there are over 50,000 islands in the arc from the Philippines to India; those shallow crossroads are vital world interests. Harpoon and Fire Scout showcase one of the growing tool combinations in our modular LCS capability set and this complex shot demonstrates why LCS has Combat as its middle name.”

 

Warship Wednesday, August 23, 2017: Wilhelmina’s Tromp card

Here at LSOZI, we are going to take off every Wednesday for a look at the old steam/diesel navies of the 1859-1946 time period and will profile a different ship each week. These ships have a life, a tale all their own, which sometimes takes them to the strangest places. – Christopher Eger

Warship Wednesday, August 23, 2017: Wilhelmina’s Tromp card

Here we see the Tromp-class light cruiser Hr. Ms. Tromp (D-28) of the Koninklijke Marine as she appeared in late 1941/early 1942 in the Dutch East Indies complete with her distinctive splinter camo. The leader of a class of four fast but small cruisers intended as “flotilla leaders” for a group of destroyers, she was a survivor and the largest Dutch warship to survive the hell of that lowland country’s combat in the Pacific.

At just 3,400-tons and 432-feet in length, the Tromp-class ships were about the size of big destroyers of their day (or frigates today), but they made up for it with an armament of a half-dozen 5.9-inch Mk 11 Bofors/Wilton-Fijenoord guns which were firmly in the neighborhood that light cruisers lived.

A suite of six torpedo tubes ensured they could perforate larger targets while geared steam turbines capable of pushing the ship at up to 35-knots gave it the option of a clean getaway from battleships. A Fokker C 11W floatplane gave long eyes while some 450-tons of armor plate (13 percent of her displacement) coupled with a dusting of AAA guns offered peace of mind against attack from low/slow aircraft and small vessels.

Floating Reconnaissance Focker C. 11 W from Tromp Cruiser, 1938

Laid down in 1936 at N.V. Nederlandsche Scheepsbouw Maatschappij, Amsterdam, the hero of our tale was named after noted Dutch Admiral Maarten Tromp, a 17th-century naval hero whose name was carried by several of Holland’s warships going back to 1809.

Billed by the Dutch as “flotilla leaders” they were meant to replace the elderly coast defense ships Hertog Hendrik and Jacob van Heemskerck and only reclassified as light cruisers in 1938 after funding was secured.

HNLMS Tromp lead ship of the Tromp-class light cruisers at high speed on trials, where she generated over 35 knots over the course. Via Postales Navales, colorized by Diego Mar

HNLMS Tromp during her first day of trials on the North Sea, 28 March 1938. Collection J. Klootwijk via NetherlandNavy.NL

Tromp would be the only one of her class completed to her intended design, commissioning 18 August 1938. Her sister Jacob van Heemskerck was still on the ways when the Germans invaded in 1940 and was later completed to a much different design while two other planned vessels were never funded.

TROMP Starboard side, from off the starboard bow circa 1938. Catalog #: NH 80909

TROMP view taken circa 1939. Catalog #: NH 80910

Following several naval reviews and waving the flag in Europe on the edge of meltdown, she sailed for the important colony of the Dutch East Indies to help beef up the KM’s strength in a region where Japan was eager to obtain Java and Sumatra’s natural resources by force if needed.

TROMP Anchored at Port Moresby, New Guinea, 4 March 1941. #: NH 80908

Netherlands east indies. 1941-03-13. Aerial starboard bow view of Dutch flotilla cruiser Tromp, at anchor in calm water with one of her boats and native craft alongside. she is painted in her pre-war scheme of light grey. note the searchlight position on the foremast. She carries a Fokker c.14w floatplane amidships which is handled by the derricks on the two Sampson posts. Her prominent rangefinder is trained to port and a turret is trained over the starboard bow. on the deckhouse, aft are twin Bofors 40 mm aa guns on triaxially stabilized hazemeyer mountings which were very advanced for the period. (AWM Naval historical collection).

When Holland fell in May 1940, the Dutch government in exile under Queen Wilhelmina maintained control of the East Indies from London and Tromp spent the first two years of WWII with her eyes peeled for German raiders and U-boats in the Pacific and put on her war paint.

Then the Japanese went hot in December 1941, striking at the Dutch, British, and Americans simultaneously. Soon Tromp, arguably one of the most capable ships at Dutch Rear Adm. Karel Doorman’s disposal, was engaged in the thick of it.

Netherlands east indies. C.1941-02. Starboard side view of the Dutch flotilla cruiser Tromp before the Badung Strait action in which she was seriously damaged. She wears a splinter-type camouflage scheme, apparently of two shades of grey, common to Dutch ships involved in the defense of the Netherlands East Indies. Note the searchlight position on the foremast. Her floatplane has been landed as has her port Sampson post. Note the prominent rangefinder above the bridge. On the deckhouse, aft are twin Bofors 40 mm aa guns on triaxially stabilized hazemeyer mountings which were very advanced for the period. (AWM naval historical collection).

During the three-day running action that was the Battle of Badung Strait, Tromp and the destroyers USS John D. Edwards, Parrott, Pillsbury, and Stewart clashed with the Japanese destroyers Asashio and Oshio in a sharp night action in the pre-dawn hours of 18 February 1942.

Dutch cruiser HNLMS Tromp The Battle of Badung Strait Painting by Keinichi Nakamura, 1943.

Tromp landed hits on both enemy ships but was also plastered by 5-inch shells from the Japanese tin cans and forced to retire.

The flotilla leader “Tromp” of the Royal Netherlands Navy, in dry dock at Cockatoo Island, for repairs after being damaged in action in the Java Sea. By Dennis Adams via AWM

Emergency repairs in Australia saved Tromp from the crushing Battle of the Java Sea at the end of February that saw the Dutch lose the cruisers Java and De Ruyter sunk and Doorman killed, effectively ending the defense of the East Indies.

After surviving the crucible, Tromp became known to her crew as “the lucky ship” which, when you realize what the Dutch went through in the Pacific, was apt.

The Dutch Navy lost 57 ships during WWII, and amazingly half of those were in the East Indies in the scant four-month period between 15 December 1941- 15 March 1942. These included the two aforementioned cruisers, eight submarines, six destroyers, and 15 smaller escorts (minelayers, gunboats, minesweepers). Even the old coast defense ship, De Zeven Provinciën was sunk at her moorings in Surabaya harbor. In contrast, the country only lost 16 ships in May 1940 when metropolitan Holland fell to the Germans.

Based out of Newcastle and later Fremantle, Australia, Tromp was augmented by several Bofors 40mm and Oerlikon 20mm mounts, given a series of surface and air warning radars, and served as a convoy escort and patrol vessel in and around Australian waters, picking up the U.S. Measure 22 camo in her work with the 7th Fleet.

Sydney, NSW. C.1943. Starboard side view of the Dutch flotilla cruiser Tromp. The splinter-type camouflage scheme worn earlier in the war has been replaced by the American measure 22 scheme, the colors probably consisting of navy blue below haze grey. Note the searchlight position on the foremast above which an American SC radar has replaced that carried earlier. Type 271 surface search radar is mounted before the mast. Amidships, above her torpedo tubes, twin AA machine guns, and a small rangefinder have been mounted in the space once occupied by her floatplane. The Sampson posts once fitted at the break of the forecastle have been replaced by 4-inch aa guns. Note the prominent rangefinder above the bridge. On the deckhouse, aft are twin Bofors 40 mm aa guns on triaxially stabilized hazemeyer mountings which were very advanced for the period. Single 20 mm Oerlikon aa guns are sited on the crowns of b and y turrets and abaft the bridge. (naval historical collection).

She was transferred to the control of the British Eastern Fleet in January 1944. Around this time, she swapped out her aging Dutch V53 torpedoes for British Mark 9s along with new mounts.

Tromp conducting anti-aircraft defense exercises with the assistance of a RAAF Consolidated Catalina flying boat off the West Australian coast via AWM.

When the Allies began pushing back into the East Indies, Tromp was there, plastering Surabaya and supporting the amphibious landing at Balikpapan in Borneo. In September 1945, as part of the end game in the Pacific, she landed Dutch Marines in Batavia to disarm the Japanese garrison and reoccupy the former colonial capital.

Tromp participated in magic carpet duty after the end of hostilities and returned to Holland for the first time since 1939, arriving at Amsterdam in May 1946, carrying 150 Dutch POWs liberated from Japanese camps.

HNLMS Tromp docked in 1946

Tromp was one of just two cruisers left in the Dutch Navy at the end of the war (the other being her sister), but she had seen hard service and carried an amalgam of Swedish, American, and British weapons and electronics, many of which were no longer supported.

Exercise using shell casings on board the Dutch light cruiser TROMP.

Following a two-year overhaul that saw much of her armament removed, she served as an accommodation and training ship with a NATO pennant number.

VARIOUS SHIPS AT ANCHOR IN MOUNT’S BAY, ENGLAND. 1 JULY 1949. (A 31535) The Dutch cruiser TROMP at anchor in Mount’s Bay. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205016274

The highlight of her post-war service was a few midshipmen cruises and attending the Spithead fleet review in 1953.

Tromp was decommissioned on 1 December 1955 and, after more than a decade in reserve status, was sold to be scrapped in Spain in 1969. Her half-sister, Jacob van Heemskerk, shared a similar fate and was scrapped in 1970.

Since then, her name has been reissued to the class leader of a group of guided-missile frigates (HNLMS Tromp F801) and in a De Zeven Provinciën-class frigate commissioned in 2003.

For more on Tromp‘s history, please visit NetherlandsNavy.NL, which has it covered in depth.

Specs:

Hr Tromp (Cruiser) – Netherlands (1938) via blueprints.com

Displacement: 3,350 long tons (3,404 t) standard
Length: 432 ft. 11 in
Beam: 40 ft. 9 in
Draught: 14 ft. 2 in
Propulsion:
2 Parsons/N.V. Werkspoor geared steam turbines
4 Yarrow boilers
2 shafts
56,000 shp (41,759 kW)
860 tons of fuel oil
Speed: 32.5 knots designed, 35 on trials
Complement:
290 as commissioned, 380 in WWII
Armor: 15mm belt, up to 30mm on bulkheads
Armament:
(1938)
6 × 150 mm Bofors Mk 11 (5.9 in) guns (3×2)
4 × 40 mm Bofors (2×2)
4 × .50 cal in two twin mounts
6 × 533 mm (21 in) torpedo tubes (2×3), 12xV53 torpedoes
(1944)
6 × 150 mm Bofors (5.9 in) guns (3×2)
4 × 75 mm U.S. AAA
8 × 40 mm Bofors (4×2)
8 × 20 mm singles
6 × 533 mm (21 in) torpedo tubes (2×3), 12xMk9 torpedoes
Aircraft carried: 1 × Fokker C.XIW floatplane

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Navy tests out a modern Bachstelze

Over the past few years DARPA has been working on their version of the old U-Boat kite.

ICYMI, during WWII, the Kriegsmarine’s U-boat fleet used about 200~ Focke-Achgelis FA 330 Bachstelze (English: Wagtail) aircraft. The FA330 was a type of rotary-wing kite that weighed about 150-pounds and, using an unpowered 24-foot three-bladed rotor for lift, was winched out into the air behind a U-boat on a 500-foot cable, allowing the adventuresome sailor in its single seat to have the best view on the boote.

A simple idea, they were complicated in use as they took a long time (20-30 minutes to assemble) and, if the kiteman saw an enemy warship, slowed the dive of the submarine far too long than was safe.

Well, the ONR and DARPA have teamed up to do the same thing but in an updated (and unmanned) version that swaps out the rotating kite wing for a much safer parafoil.

Observe the Towed Airborne Lift of Naval Systems (TALONS) below, a low-cost, elevated sensor mast being tested out on USS Zephyr, a 179-foot Cyclone-class patrol coastal. It is the first time it was used aboard a U.S. Navy vessel,  after being trialed on Sea Hunter, DARPA’s ACTUV vessel last year.

“Towed behind boats or ships, TALONS could persistently carry intelligence, surveillance, reconnaissance (ISR), and communications payloads of up to 150 pounds between 500 and 1,500 feet in altitude—many times higher than current ships’ masts—and greatly extend the equipment’s range and effectiveness.”

Melbourne hawks in review

Here we see a pair of McDonnell Douglas A4G Skyhawks of the Royal Australian Navy Fleet Air Arm 805 Squadron (VF-805) coming in low and hot over the RAN’s only operable aircraft carrier of the time, HMAS Melbourne (R21) sometime in the 1970s.

While the RAN FAA traces its lineage back to the Great War, it was only after WWII that it was able to stand up fixed-wing carrier squadrons, flying Hawker Sea Fury’s in Korea. After a brief interlude in Sea Venoms, 805 Squadron picked up their Seahawks in 1968.

The two ‘Hawks shown above were part of 21 A-4s operated by the RAN between 1967-84 with #887 eventually transferring to New Zealand from where she was sold in 2012 to Draken International (where she still flies as a contract aggressor in Florida). As for #888, she crashed in 1979 but her pilot, a U.S. Navy aviator on exchange duty, was rescued.

Why (and how to) break in an AR barrel?

Modern firearm barrels are a thing of beauty, especially with today’s world of CNC machines and ISO9000 practices making it easy to produce repeatable high-quality results even in small scale. Gone are the old days of suspect metallurgy and forming barrels with bar steel wrapped in a coil and forged into the barrel, which was common back before industrialization. Still, even small pistol and handgun barrels today have tiny rough edges and tool marks left in a barrel’s bore which need to be worked out before you can assess its accuracy potential– and the longer the barrel the more marks.

Therefore, we send some rounds downrange to smooth things out.

So how do you break in a new AR barrel? More in my column at Tac.44.com

56 years ago today, a revamped WWII task force, ready for Soviet U-boats

Photo # USN 1057640

Photo # USN 1057640

Although the Second World War was over for more than 15 years when this image was taken, the ships shown were still ready to fight it– or a Soviet Red Banner replacement for the Kriegsmarine.

The WWII-era fleet carrier, re-designated as a subbuster, USS Wasp (CVS 18) in formation with destroyers and aircraft of Anti-submarine Task Group Bravo, in the Mediterranean Sea, 19 August 1961.

All escorts are similarly WWII designed Gearing-class DDEs, likely recently FRAMM’d. Planes overhead include 10 S2F Trackers and two Douglas AD-5W Skyraiders. Two HSS-1 (Sikorsky H-34 /S-58) helicopters are flying just above the ships. While the Trackers and HSS-1s were very new and modern for the time, it should be pointed out that the Skyraider first flew in 1945.

Maschinenpistole 38 vs Maschinenpistole 40, in detail

Ian with Forgotten Weapons takes a look in-depth at the classic German 9mm sub guns of World War II, and what sets them apart.

The MP38 was an open-bolt, blowback burp gun with a folding tubular stock designed by Heinrich Vollmer who had something like a half-dozen different submachine guns in his resume beforehand. While it was a good gun, it was replaced after just two years of production by the follow-on and very similar MP40.

“Now the differences between these two guns are not mechanical at all, really,” says Ian, “They are industrial,” going on to elaborate on the manufacturing processes behind each, with the MP38 being extensively milled while the MP40 was stamped and simplified.

Further explanation and hands-on, side-by-side disassembly ensue.

Warthogs on the highway

Last week eight combat controllers of the USAF’s 352d Special Operations Wing surveyed a two-lane section of the Jägala-Käravete Highway in Estonia, deconflicted airspace, and exercised command and control on the ground and in the air to land a eight-aircraft stick of A-10Cs from the Maryland Air National Guard’s 175th Wing’s 104th Fighter Squadron.

Does it get any more 1970s Reforger than that?

New skins for an old warrior

When my grandfather joined the National Guard at 17, but before he headed off to war on active duty, he bought a “fighing knife” from a local hardware store as any strapping youth in olive drab needed just such the item.

It was a PAL RH-36.

The PAL Cutlery Company of Plattsburgh, NY. was established in 1935, specializing in kitchen implements. The company was a merger of the Utica Knife & Razor Company of Utica, NY and the Pal Blade Company of Chicago, IL. Pal used both the “Blade Company” and “Cutlery Company” monikers interchangeably during the next two decades until they went out of business in 1953. They purchased the cutlery division of Remington in 1939, along with all of their machinery, tooling and designs and soon began production in the old Remington owned factory in Holyoke, MA.

The design of the RH-36 came from that Remington acquisition, as the designations meant “Remington, Hunting, Pattern 3, 6” blade”. These were one of the most common US fighting knives of WWII, these were bought by all branches during the war, often with unit funds, and were also available as private purchase knives– such as my gramps.

Overall length is 11-inches with the razor-sharp blade just over 6, thus balancing well. Though some blades were parkerized, this one is bright though there is some patina. The old “PAL RH-36” markings are clear on the ricasso. The leather washer grip with red spacers is still tight, though dark. The pommel and guard are still surprisingly tight after more a half-century of use.

It has been sharpened and resharpened perhaps hundreds of times and was used by my grandfather overseas until he left the military in 1974, then sat in a box until I recently inherited it. The original sheath has long since broken, and subsequently discarded, leaving the blade naked.

Now, with the help of my friend Warren at Edged Creations who handcrafted the new sheath with three layers of leather, hand stitching and copper rivets, it should be good for another 70 years.

Thanks, Warren!

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