The Avro Shackleton was a British long-range maritime patrol aircraft (MPA) used by the Royal Air Force (RAF) and the South African Air Force (SAAF). It was developed by Avro from the Avro Lincoln bomber, which itself has been a development of the famous wartime Avro Lancaster bomber.
The Shackleton was developed during the late 1940s as part of Britain's military response to the rapid expansion of the Soviet Navy, in particular its submarine force. Produced as the primary type equipping RAF Coastal Command, the Type 696, as it was initially designated, incorporated major elements of the Lincoln, as well as the Avro Tudor passenger aircraft, and was furnished with extensive electronics suites in order to perform the anti-submarine warfare (ASW) mission along with a much improved crew environment to accommodate the long mission times involved in patrol work. Being known for a short time as the Lincoln ASR.3, it was decided that the Type 696 would be named Shackleton in service, after the polar explorer Sir Ernest Shackleton.
In April 1951, it entered operational service with the RAF. The Shackleton was used primarily in the anti-submarine warfare (ASW) and maritime patrol aircraft (MPA) roles; it was also frequently deployed as an aerial search and rescue (SAR) platform and for performing several other secondary roles such as mail delivery and as a crude troop-transport aircraft. In addition to its service with the RAF, South Africa also elected to procure the Shackleton to equip the SAAF. In South African service, the type was operated in the maritime patrol capacity between 1957 and 1984. During March 1971, in one high-profile incident, a number of SAAF Shackletons was used to effect during the SS Wafra oil spill, having intentionally sunk the stricken oil tanker using depth charges in order to prevent further ecological contamination.
During the 1970s, the Shackleton was replaced in the maritime patrol role by the jet-powered Hawker Siddeley Nimrod. During its later life, a small number of the RAF's existing Shackletons received extensive modifications in order to adapt them to perform the airborne early warning (AEW) role. The type continued to be used in this support capacity until 1991, at which point it has been replaced by the newer Boeing E-3 Sentry AEW aircraft. These were the last examples of the type remaining in active service.
The Martin JRM Mars is a large, four-engined cargo transportflying boat designed and built by the Martin Company for the United States Navy during WW2. It was the largest Alliedflying boat to enter production, although only seven were built. The United States Navy contracted the development of the XPB2M-1 Mars in 1938 as a long-range ocean patrol flying boat, which later entered production as the JRM Mars long-range transport.
The Glenn L. Martin Company scaled up their PBM Marinerpatrol bomber design to produce the prototype XPB2M-1 Mars. The XPB2M-1 was launched on 8 November 1941. After a delay caused by an engine fire during ground runs, the aircraft first flew on 23 June 1942. After flight tests with the XPB2M between 1942 and 1943, she was passed on to the Navy. The original patrol bomber concept was considered obsolete by this time, and the Mars was converted into a transport aircraft designated the XPB2M-1R. The Navy was satisfied with the performance, and ordered 20 of the modified JRM-1 Mars. The first, named Hawaii Mars, was delivered in June 1945, but with the end of World War II the Navy scaled back their order, buying only the five aircraft which were then on the production line. Though the original Hawaii Mars was lost in an accident on the Chesapeake Bay a few weeks after it first flew, the other five Mars were completed, and the last delivered in 1947.
Four of the surviving aircraft were later converted for civilian use to firefighting water bombers. In 1959, the remaining Mars aircraft were to be sold for scrap, but a Canadian company, Forest Industries Flying Tankers (FIFT), was formed and bid for the four aircraft and a large spares inventory. The company represented a consortium of British Columbia forest companies, and the bid was accepted and the sale completed in December 1959. The four aircraft were flown to Fairey Aviation at Victoria, British Columbia, for conversion into water bombers. The conversion involved the installation of a 6,000 imp gal (27,000 l; 7,200 US gal) plywood tank in the cargo bay with retractable pick-up scoops to allow uploading of water while the aircraft was taxiing. The scoops allowed 30 tons of water to be taken on board in 22 seconds. Later some of the hull fuel tanks were replaced with water tanks.
The Neutrality Acts were passed by the United States Congress in the 1930s, in response to the growing turmoil in Europe and Asia that eventually led to World War II. They were spurred by the growth in isolationism and non-interventionism in the US following its costly involvement in World War I, and sought to ensure that the US would not become entangled again in foreign conflicts.
The legacy of the Neutrality Acts is widely regarded as having been generally negative: they made no distinction between aggressor and victim, treating both equally as "belligerents"; and they limited the US government's ability to aid Britain and France against Nazi Germany. The acts were largely repealed in 1941, in the face of German submarine attacks on U.S. vessels and the Japanese attack on Pearl Harbor. https://en.wikipedia.org/wiki/Neutrality_Acts_of_1930s
Blackett's team at Coastal Command's Operational Research Section (CC-ORS) included two future Nobel prize winners and many other people who went on to be pre-eminent in their fields. They undertook a number of crucial analyses that aided the war effort. Britain introduced the convoy system to reduce shipping losses, but while the principle of using warships to accompany merchant ships was generally accepted, it was unclear whether it was better for convoys to be small or large. Convoys travel at the speed of the slowest member, so small convoys can travel faster. It was also argued that small convoys would be harder for German U-boats to detect. On the other hand, large convoys could deploy more warships against an attacker. Blackett's staff showed that the losses suffered by convoys depended largely on the number of escort vessels present, rather than the size of the convoy. Their conclusion was that a few large convoys are more defensible than many small ones.
The Western Approaches Tactical Unit (WATU) was a unit of the British Royal Navy created in January 1942 to develop and disseminate new tactics to counter German submarine attacks on trans-Atlantic shipping convoys. It was led by Captain Gilbert Roberts and was principally staffed by officers and ratings from the Women's Royal Naval Service (Wrens). Roberts was first introduced to wargaming during a stint at the Portsmouth Tactical School from 1935 to 1937. Roberts took to wargaming with great enthusiasm, and developed his own rulesets. Roberts' wargames were based on the wargames developed by Fred T. Jane in 1898 (Jane Naval Wargame and Fighting Ships).
The WATU's primary tool for studying U-boat attacks and developing countermeasures was wargames. After the U-boat threat to merchant shipping was defeated, WATU continued to develop anti-submarine tactics for later stages of the war, including Operation Overlord and the Pacific War. WATU trained naval officers in its tactics by hosting week-long training courses in which the students played wargames. WATU formally ceased operations at the end of July 1945.
The Supermarine Walrus (originally known as the Supermarine Seagull V) was a British single-engine amphibiousbiplane reconnaissance aircraft designed by R. J. Mitchell and first flown in 1933. Designed for use as a fleet spotter to be catapult launched from cruisers or battleships, the Walrus was later employed in other roles, notably as a rescue aircraft for aircrew in the sea. The Walrus continued in service throughout the Second World War, with the Fleet Air Arm (FAA), Royal Air Force (RAF), Royal Australian Air Force (RAAF), Royal New Zealand Navy (RNZN) and Royal New Zealand Air Force (RNZAF). It was the first British squadron-service aircraft to incorporate in one airframe a fully retractable main undercarriage, completely enclosed crew accommodation and all-metal fuselage.
Coastal Command's Operational Research Section (CC-ORS): While performing an analysis of the methods used by RAF Coastal Command to hunt and destroy submarines, one of the analysts asked what colour the aircraft were. As most of them were from Bomber Command they were painted black for night-time operations. At the suggestion of CC-ORS a test was run to see if that was the best colour to camouflage the aircraft for daytime operations in the grey North Atlantic skies. Tests showed that aircraft painted white were on average not spotted until they were 20% closer than those painted black. This change indicated that 30% more submarines would be attacked and sunk for the same number of sightings. As a result of these findings Coastal Command changed their aircraft to using white undersurfaces."
HMS Troubridge was an T-class destroyer of the British Royal Navy that saw service during the Second World War.
In 1943, Troubridge was sent to the Mediterranean, where she performed screening duties for major naval units. Troubridge was one of the units that performed as a screen for the cruisers Aurora, Newfoundland, Orion, Penelope and Euryalus, in conjunction with Mediterranean Fleet destroyers and motor torpedo boats for the surrender of Pantellaria on 10 May 1943. She provided support to offensives on Italian warships, provided anti-aircraft support, and was involved in the Allied effort to land in Sicily, Calabria, and Salerno. Other notable events involving Troubridge was the sinking of the German submarine U-407. U-407 was sunk in the Mediterranean south of Milos, in position 36º27'N, 24º33'E, destroyed by depth charges dropped from the destroyers Troubridge, Terpsichore, and the Polish ORP Garland. U-407's sinking also marked the disbandment of the 29th U-boat Flotilla. In 1944 Troubridge transferred to the Far East and operated under US control. Amongst other engagements, she took part in an attack on Truk. She returned to Portsmouth in 1946.
A corvette is a small warship. It is traditionally the smallest class of vessel considered to be a proper (or "rated") warship. The warship class above the corvette is that of the frigate, while the class below was historically that of the sloop-of-war. The modern types of ships below a corvette are coastal patrol craft, missile boat and fast attack craft. In modern terms, a corvette is typically between 500 tons and 2,000 tons, although recent designs may approach 3,000 tons, which might instead be considered a small frigate.
The word "corvette" is first found in Middle French, a diminutive of the Dutch word corf, meaning a "basket", from the Latin corbis.
The rank "corvette captain", equivalent in many navies to "lieutenant commander", derives from the name of this type of ship. The rank is the most junior of three "captain" ranks in several European (e.g., France, Spain, Italy, Croatia) and South American (e.g., Argentina, Chile, Brazil) navies, because a corvette, as the smallest class of rated warship, was traditionally the smallest class of vessel entitled to a commander of a "captain" rank. https://en.wikipedia.org/wiki/Corvette
On 10 November 1943, the crew of U-966 scuttled her in the Bay of Biscay off O Porto de Bares, Galicia, Spain, after several depth charge attacks badly damaged her. U-966 was attacked by an RAF Wellington of 612 Squadron/B and then US Navy B-24 Liberators of squadrons VB-103 and VB-110.
Later that day Liberator GR Mk V BZ774/D of the RAF's Czechoslovak-crewed 311 Squadron/D sighted U-966 at 43°45′N 08°00′W. The submarine headed for the netural Spanish coast at full speed but at 1354 hrs BZ774/D attacked her with wing-mounted SAP60 semi-armour piercing rocket projectiles (RP's).
Several of the RP's failed to function, and the Czechoslovak aircrew was unable to see any effects on the target from those that did. But U-966 slowed to an estimated six to eight knots, and then within 200 yards (180 m) of the Spanish coast she slowed to two knots before running aground. 42 of her 50 crew survived. They scuttled her, took to their dinghies and were interned in Spain.[4]
The wreck is at 43°46′8″N 07°38′0″WCoordinates: 43°46′8″N 07°38′0″W.
Divers have found wreckage from a Nazi World War Two U-boat near the coast of Galicia in north-western Spain.
U-966 was heavily damaged by Allied bombers in November 1943, so the crew blew it up with timed charges and all but eight reached dry land.
US Navy and RAF Liberator bombers targeted U-966 with depth charges for a whole day, as the German submarine zig-zagged and fired its anti-aircraft gun.
One Allied plane was shot down - reportedly an RAF Catalina flying boat.
An RAF Wellington bomber also took part in the submarine chase and dropped depth charges.
The U-boat was returning from an operation off the coast of North America when it was detected by the Allies. Bombers attacked it repeatedly on 10 November 1943, crippling it.
U-boats had inflicted enormous damage on Allied shipping earlier in the war. They attacked supply convoys as well as naval vessels.
The Gut Holz, 67m (220ft) long, was nearly brand new. It had been launched in January 1943, and had a career lasting just 10 months.
Spain's fascist dictator, Gen Francisco Franco, was not officially allied with Nazi Germany, but the supposedly neutral country was known to assist the Nazi war effort in various ways. Those friendly relations enabled surviving sailors to get back to Germany. https://plus.google.com/103755316640704343614/posts/CoBczxRicPX
Dubbed as the “Silent Service,” submarines are considered the most survivable weapons-delivery platform. Submarine detection and monitoring was traditionally the exclusive domain of highly classified military units specializing in naval anti-submarine warfare (ASW). Military ASW employs technologies such as magnetic anomaly detectors (MAD), which detect tiny disturbances to Earth’s magnetic field caused by metallic submarine hulls, passive and active sonar sensors that use sound propagation to detect objects underwater, as well as radar and high-resolution satellite imagery to detect surfaced submarines. Recent advances in commercial tools and technologies now give open-source researchers some ability to monitor submarine fleets. With commercial satellite imagery, synthetic aperture radar (SAR), hydro-acoustic sensors, and even social media analysis, open-source researchers can better understand the size and composition of countries’ submarine fleets, monitor the construction of submarines and submarine bases, and potentially learn about patrol patterns and behaviors.
A submarine can be detected by a number of different sensors and methods.