MAS (motorboat)

Motoscafo armato silurante (Italian: "torpedo armed motorboat"), commonly abbreviated as MAS was a class of fast torpedo armed vessel used by the Regia Marina (the Royal Navy of Italy) during World War I and World War II. Originally, "MAS" referred to motobarca armata SVAN ("armed motorboat SVAN"), where SVAN stood for Società Veneziana Automobili Navali ("Naval Automobile Society of Venice).[1]

MAS were essentially motorboats with displacements of 20–30 tonnes (depending on the class), a 10-man crew, and armament composed of two torpedoes, machine guns and occasionally a light gun.

The term "MAS" is an acronym for Mezzi d'Assalto, ("assault craft") in the unit name Flottiglia MAS ("assault craft flotilla"), the most famous of which was the Decima MAS of World War II.

Camouflaged World War II MAS in the Mediterranean Sea

World War I

1917 063 Motoscafo
An early MAS, from a magazine article published in January 1917
1917 063 ArmaSuMotoscafo
An Italian sailor manning a quick-firing gun, a 1-pounder (37 mm) Hotchkiss, on a MAS, 1917

MAS were widely employed by Regia Marina during World War I in 1915–1918. Models used were directly derived from compact civilian motorboats, provided with petrol engines which were compact and reliable (characteristics which were not common at the time) . They were used not only in the anti-submarine patrol role, but also for daring attacks against major units of the Austro-Hungarian Navy.

A significant success came in December 1917, when an MAS boat managed to sink the pre-dreadnought battleship SMS Wien in Trieste harbor. The greatest success of Italian MAS was the sinking of the Austro-Hungarian battleship SMS Szent István off Pula on 10 June 1918 by a boat commanded by Luigi Rizzo. MAS boats later engaged in the Second Battle of Durazzo in October 1918.

The main Austrian fleet remained securely at anchor in the harbour at Pola (present-day Pula in Croatia), protected by several layers of defensive booms, impassable to conventional MAS boats. A special version was therefore designed, the Grillo-class tracked torpedo motorboat or Barchino Saltatore ("Jumping Boats"), which featured a pair of spiked continuous tracks, intended to allow them to clamber over the booms which were supported by large timber baulks. The boats were powered by an electric motor for a silent approach and carried two torpedoes. Four were built; the first two were scuttled when their slow motors failed to get them to the harbour booms at Pola before daybreak and in a second operation, another boat made such a loud clattering noise climbing the booms that it was spotted and destroyed by gunfire.[2]

Interwar Period and Spanish Civil War

In 1926, four MAS boats were built for and purchased by the Royal Albanian Navy. They were named Tirana, Saranda, Durres, and Vlorë. During the Italian invasion of Albania they were seized and put into service by Italian forces. All survived World War II and in 1945 were returned to Albania.

Four units were transferred to the Nationalist Navy during the Spanish Civil War in 1938: Sicilia (LT-18), ex MAS 100; Nápoles (LT-19), ex MAS 223; Cándido Pérez (LT-16), ex MAS 435; and Javier Quiroga (LT-17), ex MAS 436.

World War II

Italian MAS continued to be improved after the end of World War I, thanks to the availability of Isotta Fraschini engines. The MAS of World War II had a maximum speed of 45 knots, two 450 mm torpedoes and one machine gun for anti-aircraft fire. In 1940 there were 48 MAS 500-class units available. Older units were used in secondary theatres, such as the Italian East Africa.

Notable war actions performed by MAS include the torpedoing of the Royal Navy C-class cruiser Capetown by MAS 213 of the 21st MAS Squadron working within the Red Sea Flotilla off Massawa, Eritrea; and the failed attack on the harbour of Malta in January 1941, which caused the loss of two motorboats, one of them recovered by the British, put in service as a tender and renamed XMAS.[3] Five MAS were scuttled in Massawa in the first week of April 1941 as a part of the Italian plan for the wrecking of Massawa harbor in the face of the British advance. MAS 204, 206, 210, 213, and 216 were sunk in the harbor; four of the boats were in need of mechanical repairs and could not be evacuated. On 24 July 1941, amid heavy fire from the escorts, MAS 532 torpedoed and crippled the transport Sydney Star, part of the British convoy GM 1. The steamer managed to limp to Malta assisted by the destroyer HMAS Nestor.[4] On 1 December 1941, two Italian MAS boats engaged with machine gun fire and forced to run aground on the Turkish coast the Soviet icebreaker Anastas Mykoyan off Kastelorizo, while on route from the Dardanelles to Suez. In spite that the Soviet vessel was refloated and reached Haifa for repairs the next day, the action compelled the Turkish government to intern eight Soviet ships set to repeat the same journey.[5] MAS 554, 554 and 557 sank three allied freighters on 13 August 1942 off Cape Bon, in the course of Operation Pedestal, for a total tonnage of 48,500 tons.[6] On 29 August 1942, a smaller type of MAS boat, the MTSM, torpedoed and disabled for the rest of the war the British destroyer Eridge off El Daba, Egypt.[7]

MAS 526(528)
The Italian torpedo boat MAS 528 on Lake Ladoga in June 1942, during the Siege of Leningrad

A flotilla of MAS served at German request as reinforcements in the Black Sea for the planned attack on Sevastopol in June 1942. The MAS squadron came under intense air attack from Soviet fighter-bombers and torpedo boats but performed well. They sank the 5,000-ton steamer Abkhazia and disabled the 10,000-ton transport Fabritius, which was subsequently destroyed by Stuka dive-bombers. MAS boats destroyed troop barges and damaged Soviet warships. A MAS boat commander was killed in battle. One MAS was destroyed and three damaged by fighter-bombers in September 1942 during a heavy attack on Yalta. In the early hours of 3 August 1942, three MAS boats torpedoed and disabled the Soviet cruiser Molotov south-west of Kerch.[8]

In May 1943, the seven MAS boats in the Black Sea were transferred to the Kriegsmarine. In August that year, they were transferred to the Romanian Navy. These seven boats were wooden-hulled, each displacing 25 tons. Top speed amounted to 42 knots, generated by petrol engines powering two shafts. They were armed with one 13 mm heavy machine gun or one 20 mm anti-aircraft gun, 6 depth charges and two 350 mm torpedoes.[9]

Another flotilla of four MAS, the XII Squadriglia MAS, was deployed to Lake Ladoga in April 1942 to support the siege of Leningrad. They sank a Soviet gunboat of the Bira class, a 1,300-ton cargo ship and several barges.[10] Soviet sources say that the gunboat, the Selemdzha, was only lightly damaged when the torpedo exploded in the lake's bottom, with two wounded on board.[11]

After the signing of the Cassibile agreement, MAS boats sank the German torpedo boat TA11 (ex French L'Iphigénie) at Piombino, on 11 September 1943.[12]

The obsolescence of small MAS became apparent during the conflict, and they were increasingly replaced by larger Yugoslavian E-boats built in Germany and by new improved versions, classified "MS" (Moto Siluranti) by the Regia Marina.

A type of anti-submarine craft based on the MAS design was developed by the Italian Navy in World War II. This was the vedetta anti sommergibile, or "VAS", equipped with a good amount of anti-submarine warfare equipment given her small size.[13]

Cultural legacy

The Italian poet Gabriele d'Annunzio, who employed MAS in some of his World War I adventures, used the MAS acronym for his Latin motto: Memento audere semper ("remember always to dare").

Surviving examples

See also


  1. ^ Naval Weaponry: Italy's MAS Torpedo Boats
  2. ^ Sondhaus, Lawrence (1996). The Naval Policy of Austria-Hungary, 1867-1918: Navalism, Industrial Development and the Politics of Dualism. Purdue University Press. p. 334. ISBN 978-1557530349.
  3. ^ Nicholson, Arthur (2015). Very Special Ships: Abdiel Class Fast Minelayers of World War Two. Seaforth Publishing. p. 68. ISBN 1848322356.
  4. ^ Brown, David (2002). The Royal Navy and the Mediterranean: November 1940-December1941, Volume II. Routledge, pp. 147–148. ISBN 0-7146-5205-9
  5. ^ Jordan, John (2009). "Italian Fast Coastal Forces: Development, Doctrine and Campaigns 1914-1986". Warship: 71.
  6. ^ Greene, Jack & Massignani, Alessandro (1998). The Naval War in the Mediterranean, 1940–1943, Chatham Publishing, pp. 253–255. ISBN 1-86176-057-4
  7. ^ HMS Eridge (L68)
  8. ^ M.A.S. and Midget Submarines in the Black Sea 1942–1943
  9. ^ Conway's All the World's Fighting Ships, 1922-1946, Conway Maritime Press, 1980, pp. 313-314
  10. ^ MAS operations on Lake Ladoga (in Italian)
  11. ^ "Gunboats of USSR in WW2". Retrieved 29 July 2018.
  12. ^ "FR L'Iphigénie of the French Navy - French Torpedo boat of the La Melpoméne class - Allied Warships of WWII -". Retrieved 28 December 2015.
  13. ^ MAS, VAS, and MS

External links

Decima Flottiglia MAS

The Decima Flottiglia MAS (Decima Flottiglia Motoscafi Armati Siluranti, also known as La Decima or Xª MAS) (Italian for "10th Assault Vehicle Flotilla") was an Italian commando frogman unit of the Regia Marina (Italian Royal Navy) created during the Fascist regime.

The acronym MAS also refers to various light torpedo boats used by the Regia Marina during World War I and World War II.Decima MAS was active during the Battle of the Mediterranean and took part in a number of daring raids on Allied shipping.

These operations involved surface speedboats (such as the Sinking of HMS York), manned torpedoes (the Raid on Alexandria) and Gamma Frogmen (against Gibraltar).

During the campaign Decima MAS took part in more than a dozen operations which sank or damaged five warships (totalling 72,000 Gross Register Tonnage) and 20 merchant ships (totalling 130,000 GRT).

In 1943, after the Italian dictator Benito Mussolini was ousted, Italy left the Tripartite Pact and joined the Allies. Some of the Xª MAS men who were stationed in German-occupied northern Italy enlisted to fight for Mussolini's newly formed Italian Social Republic (Repubblica Sociale Italiana or RSI) and retained the unit title, but were primarily employed as an anti-partisan force operating on land. Other Xª MAS men in southern Italy or other Allied-occupied areas joined the Italian Co-Belligerent Navy as part of the Mariassalto (Naval Assault) unit.

June 10

June 10 is the 161st day of the year (162nd in leap years) in the Gregorian calendar. 204 days remain until the end of the year.

PT boat

A PT boat (short for patrol torpedo boat) was a torpedo-armed fast attack vessel (MTB) used by the United States Navy in World War II. It was small, fast, and inexpensive to build, valued for its maneuverability and speed but hampered at the beginning of the war by ineffective torpedoes, limited armament, and comparatively fragile construction that limited some of the variants to coastal waters.

The PT boat was very different from the first generation of torpedo boat, which had been developed at the end of the 19th century and featured a displacement hull form. These first generation torpedo boats rode low in the water, displaced up to 300 tons, and had a top speed of 25 to 27 kn (29 to 31 mph; 46 to 50 km/h). During World War I Italy, the US and UK developed the first high-performance motor torpedo boats (often with top speeds over 40 kn (46 mph; 74 km/h)) and corresponding torpedo tactics, but these projects were all quickly disbanded with the Armistice. World War II PT boats continued to exploit some of the advances in planing hull design borrowed from offshore powerboat racing and were able to grow in size due to advancements in engine technology.

During World War II, PT boats engaged enemy warships, transports, tankers, barges, and sampans. As gunboats they could be effective against enemy small craft, especially armored barges used by the Japanese for inter-island transport. Several saw service with the Philippine Navy, where they were named "Q-boats", most probably after President Manuel L. Quezon.Primary anti-ship armament was four 2,600 pound (1,179 kg) Mark 8 torpedoes. Launched by 21-inch Mark 18 (530 mm) torpedo tubes, each bore a 466-pound (211 kg) TNT warhead and had a range of 16,000 yards (14,630 m) at 36 knots (66 km/h). Two twin M2 .50 cal (12.7 mm) machine guns were mounted for anti-aircraft defense and general fire support. Some boats shipped a 20 mm Oerlikon cannon.

Propulsion was via a trio of Packard 4M-2500 and later 5M-2500 supercharged gasoline-fueled, liquid-cooled marine engines.

Nicknamed "the mosquito fleet" – and "devil boats" by the Japanese – the PT boat squadrons were hailed for their daring and earned a durable place in the public imagination that remains strong into the 21st century.

Italian naval ship classes of World War I
Dreadnought battleships
Pre-dreadnought battleships
Ironclad battleships
Armored cruisers
Protected cruisers
Torpedo cruisers
Torpedo boats
Other vessels
Aircraft carriers
Patrol craft
Fast attack craft
Mine warfare
Command and support


This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.