The Tenth Light Flotilla
Between the wars, the Italian Navy continued to display interest in small‑boat warfare and, in 1936, formed the unit which was to become famous as the Decima Flottiglia MAS (10th Light Flotilla) specifically for operations of this type. At about the same time, General Duke Amadeo of Aosta of the Italian Air Force and his brother, Admiral Duke Aimone of Spoleto, conceived the project of mounting small explosive boats between the floats of obsolescent Savoia‑Marchetti S.55 flying boats. The boats were to be released at close range for mass attacks on enemy naval bases immediately after the beginning of hostilities. The prototype, a flimsy wood‑and‑canvas craft with a small, bow‑mounted, impact‑fused explosive charge, was designed by the engineer Guido Cattaneo and by Cdr Mario Giorgini. The project was thereafter allowed to languish until the appointment to the command of the Italian Navy’s light forces, in 1938, of Cdr Paolo Aloisi. While the training of personnel continued under Aloisi’s direction, Cattaneo and the Baglietto yard at Varazze worked to produce an ingenious and effective EMB that was available for use by the‑time of Italy’s entry into the war on 10 June 1940.
MTM: the Italian Navy’s Explosive Motorboat
The basic EMB employed by the 10th Light Flotilla during World War II was the MTM (Motoscafi da Turismo naodificati, “modified tourist motorboat”); these were commonly known as barchini esplosivi (“explosive boats”) or simply barchini. (An authoritative Italian source refers to the MTMs as “E‑boats”: I have avoided this usage in order not to confuse the MTM with the German MT13 to which this name is most often applied.)
The one‑man, 17ft (5.2m) MTM displaced 1.5 tons (1.52 tonnes) and was powered by an Alfa Romeo 2500 internal combustion engine of 95bhp. It had a maximum speed of 34kt (39.lmph, 62.9kmh) and an action radius of some 60nm (69 miles, l l lkm) at high speed or a total endurance of some five hours. Itspropeller and rudder were mounted as a single outboard unit which could be lifted by the pilot in order to cross defensive netting. It was armed with a 6601b (300kg ) bow mounted explosive charge.
Having reached an attacking position, the MTM’s pilot, who wore a frogman’s suit and was housed in a partly shielded cockpit at the stern, set his boat on a collision course, locked the rudder, increased to maximum speed and then, when less than 100yds (90m) from his target, tripped a lever that freed the wooden back‑rest of his cockpit, before himself taking to the water. In the few seconds between his ditching and the MTM’s impact with the target, the pilot scrambled on to his wooden life‑raft in order to escape the shock‑wave caused by the explosion of the boat’s warhead.
When the unmanned boat struck the target, small impact‑fused charges set centrally around its hull broke the MTM apart. When its fore‑part had sunk to a depth pre‑set according to the estimated draught of the target ship, hydrostatic pressure triggered the main charge. In theory, therefore, the MTM was not a suicide weapon. Nevertheless, such a complex detonation system was obviously liable to malfunction and for this reason, as well as to ensure that his boat actually struck its target, the MTM pilot was often tempted to set his fuse to explode on impact and to stay with his craft until it was too late to save himself. As the brief account of MTM operations given below shows, pilots were on occasion asked, or ordered, to sacrifice themselves in order to ensure success.
MTMs were generally carried to their operational areas aboard warships specially equipped for such duties with deck clamps for transport and electrically‑powered hoists for launching. When thus equipped, the 970‑ton (986 tonne) Sella‑class destroyers Francesco Crispi and Quintino Sella proved capable in trials of launching six MTM apiece within 35 seconds.
A smaller version of the MTM, the MTR, was designed to be carried to its attack zone in a metal cylinder (the same cylinder designed to house the Pig manned torpedo) on the hull of a submarine. Also operated by the 10th Light Flotilla were the MTSM (Motoscafi da 7hrismo, Siluranti, Modificati, “tourist motorboat, torpedo, modified”) and its later development the SMA (Silurante, Modificato, Allargato, “torpedo, modified, enlarged boat”). These were not EMBs but small MTBs, somewhat resembling the British CMBs of World War I.
In view of the remarks concerning Japanese criteria for selecting personnel for suicidal duties, it is worth noting a major aspect of Italian selection procedure. At the Training Centre for Sea Pioneers, San Leopoldo, Livorno, established in September 1940 to train crews for assault craft duties, the emotional stability and general moral character of the volunteers was considered to be even more important than their physical aptitude for such work.
Soon after Italy’s entry into the war, command of what by now had become the 10th Light Flotilla was assumed by Commander Vittorio Moccagatta. The Flotilla’s “surface division”, responsible for EMB operations, was headed by LtCdr Giorgio Giobbe. The Pigs were soon inaction; the operational debut of the MTM explosive boats was, however, delayed to await a suitable target. A favourable opportunity came early in 1941, with the increasing buildup of Allied shipping off Greece and, particularly, in the anchorage of Crete.
Date: 26 March 1941
Place: Suda Bay, Crete
Attack by: MTM boats of the Italian 10th light Flotilla
Target: Allied warships and transports at anchor
During early 1941, close aerial surveillance was maintained on Suda Bay, the Allied fleet anchorage in northwest Crete; while at Parteni Bay on the Dodecanese island of Leros the 10th Light Flotilla waited to sortie. Twice, in January and again in February, the Francesco Crispi and Quintino Sella sailed with MTMs aboard‑and twice the mission was aborted because air reconnaissance reported a lack of suitable targets. Nevertheless, in spite of British air raids that inflicted casualties on the unit, the Flotilla’s morale remained high. On 25 March, the two destroyers lay at Astypalaia Island in the Dodecanese, with MTMs aboard. Weather conditions were good‑sea calm and moon dark‑and reconnaissance reported a large cruiser, two destroyers and at least 12 transports in Suda Bay. Immediately after an air raid that caused slight damage to Crispi, a sortie was ordered. Each destroyer carried three MTMs, the boat unit being commanded by Lt Luigi Faggioni.
The MTMs were launched some 9nm (10.3 miles, 17km) off the entrance to Suda Bay at 2330 on 25 March. Sailing in formation, the small craft reached the mouth of the 6 mile (l 0km) long Bay before 0100 on 26 March and moved into the narrow inlet leading to the anchorage. Barring their way were three buoy‑and‑net booms, covered by artillery batteries ashore and periodically swept by searchlights. By 0445 the shallow‑draught boats had successfully negotiated all three barriers undetected. Gathering his force together, Lt Faggioni ordered them to stop engines and await the light of dawn before making their attacks. They lay so close to the Allied ships that the sounds of reveille aboard could be clearly heard at 0500, when, under minimum power, the MTMs of SubLt Angelo Cabrini and CPO Tullio Tedeschi moved to within about 300yds (275m) of the major objective, the 8,250‑ton (8382‑tonne) cruiser HMS York.
At 0530, as the light rapidly improved, Cabrini and Tedeschi opened their throttles and headed at maximum speed, side by side, towards York. The attack went according to the book: ditching some 90yds (82m) short of the target, both pilots were safe aboard their life‑rafts when their boats struck the 575ft (175m) long cruiser. With a gaping wound in her side, York began to list almost immediately, while gunners aboard and ashore opened up at the invisible “low‑flying aircraft” which were presumed to be attacking. (Lt Faggioni, taken from the water and made prisoner, was immediately asked what had happened to his aircraft.)
Meanwhile, CPO Lino Beccati had scored a crippling hit on the Norwegian tanker Pericles (8,324 tons, 8457 tonnes), while the MTMs of Master Gunner Alessio De Vito and Sergeant Gunner Emilio Barberi narrowly missed other transports. Lt Faggioni himself had held back, intending to make a run on York if necessary: seeing the cruiser hard hit, he picked a nearby warship (thought to be the cruiser HMS Coventry) as his target, but missed. All the Italian pilots survived to be taken prisoner. York was towed inshore and settled on the bottom, where German aerial bombing soon rendered her a constructive total loss. (Italian sources claim that no further damage was inflicted by German aircraft, and that British demolition charges completed the work the 10th Light Flotilla had begun.) Pericles broke in two and sank when an effort was made to tow her to Alexandria for repair.
Date: 26 July 1941
Place: Grand Harbour, Valletta, Malta
Attack by: Italian MTM boats and Maiali torpedoes
Target: Allied warships and transports at anchor
The MTM pilots who had made the hazardous and successful attack at Suda Bay had all survived, but the last major operation in which MTMs were deployed (their role subsequently being taken over by the small, torpedo‑armed MTSM and SMA boats mentioned above) proved to be a true suicide mission‑both in execution and, it may be suspected, in planning. At Suda Bay, the frail explosive boats had been pitted against an unprepared enemy and improvised defences at a location that had been thoroughly reconnoitered. This was not the case with the newly‑chosen target: after MTMs had been launched to make seaborne reconnaissance of such Allied anchorages as Porto Edda (Sarande) in southern Albania, and Corfu, the choice fell on the Allies’ Mediterranean bastion‑Malta. In spite of its formidable defences and the lack of intelligence concerning them, Grand Harbour at Valletta was designated the target.
It must have been obvious at the planning stage that self‑sacrifice would be unavoidable if the attackers were to penetrate the anchorage and that, even if the penetration were made, there would be little chance of survival for the crews of small boats under concentrated fire in the narrow, crowded harbour. This was certainly realized by Maggiore Genio Nauale (Major, naval rank) Teseo Tesei, co‑inventor of the Pig, who maintained that the attack should be made simply as a demonstration of Italian gallantry and determination, as an inspiration to “our sons and Italy’s future generations”. Tesei, who had already been told that his exploits in Pigs had overstrained his heart and that he faced death if he did not retire from operations, wrote a farewell letter shortly before the Malta mission in which he stated his intention of “winning the highest of all honours, that of giving my life for the King and the honour of the Flag.” Tesei’s determination was matched by that of Cdr Moccagatta and, faced with such enthusiasm, Admirals de Courten and Campioni of the Naval Chiefs of Staff gave somewhat grudging approval to the mission. It will be noted that, as in Japan, the employment of suicidal weapons and tactics was, at first, more enthusiastically advocated by junior officers than by their superiors; ie, by the men who would be intimately concerned with the operation of such weapons.
After a further series of seaborne reconnaissances, it was decided to mount the attack on Malta on the night of 27‑28 June. Late on 27 June, a small task force of MTMs towed by MTBs sailed from Augusta, eastern Sicily, where training had been underway since April. Foul weather forced a return to base. Two nights later, Moccagatta’s force tried again: this time, engine failure on two MTMs resulted in a further postponement‑until the corresponding dark of the moon in July. Profiting from experience, Moccagatta now changed the composition of his task force: instead of being towed to the operational area, the MTMs would be carried aboard the fast sloop Diana (1,764 tons, 1792 tonnes; originally built as Mussolini’s official yacht) and would be led into the attack by an MTSM and, at the insistence of Major Tesei, by two Pigs. The human torpedoes would, in fact, spearhead the attack: one would blow a hole in the net defences of Grand Harbour; the other would make a diversionary raid on the Royal Navy’s submarine base at Marsa‑Muscetto, in the western arm of Valletta harbour. An air raid was timed to coincide with the surface attack and was expected fully to occupy the harbour batteries.
Moccagatta’s force sailed from Augusta at sunset on 25 July. Aboard Diana (LtCdr Mario Di Muro) were nine MTMs; an MTSM, in which LtCdr Giobbe would direct the attack; and a small, electric‑powered (and therefore silent‑running) motorboat which would carry the two Pigs to their launching point. The Pigs were carried from Augusta on the 20‑ton (20.3 tonne) motor torpedo boats MAS 451 (SubLt Giorgio Sciolette) and MAS 452 (Lt G. Batta Parodi ). The Pig crews were Major Tesei with CPO Alcide Pedretti and Lt Franco Costa with Sgt Luigi Barla. Thus, the commander of 10th Light Flotilla (Moccagatta, aboard MAS 452) and all his principal officers intended to play an active part in the desperate enterprise; even the Flotilla’s chief medical officer, Captain Surgeon Bruno Falcomata volunteered as a member of MAS 452’s crew. Although the mission had not been planned to take advantage of the fact, Valletta now offered an excellent selection of targets, for the transports of the hard‑fought “Substance” convoy had entered Grand Harbour on 24 July.
Gallant Failure at Valletta
Nine MTMs were launched from Diana some 20nm (23 miles, 37km) off Malta at some time before midnight on 25 July. One sank immediately. The remaining eight, with the electric launch carrying the Pigs, headed inshore, escorted by the MTSM and the two MTBs. By 0300 on 26 July, the electric launch was within 1,100yds (1000m) of the entrance to Grand Harbour, at which point the Pigs were to launch. Engine failure on the Pig of Costa and Barla delayed the launching time by at least one hour (en route to their target, Marsa‑Muscetto, the engine failed again and, unable to complete their mission, the two men were later taken prisoner). Tesei and Pedretti had the vital task of destroying the steel‑plate‑and‑mesh anti‑torpedo net, suspended from a two‑span bridge, that guarded the narrow passage leading into Grand Harbour below Fort St Elmo. In spite of the delay in launching, Tesei made it clear that he intended to destroy the net at the appointed time (0430) ‑even if, as seemed likely, this entailed the self‑destruction of himself and Pedretti. Meanwhile, Giobbe told the MTM pilots that if, following up Tesei, they found the barrier still intact, the leaders must sacrifice themselves in order to ensure that at least one boat penetrated the harbour and reached Allied shipping.
But by the time the Pigs were on the way, the harbour defence force was on the alert. Diana’s arrival and departure had been logged by surface radar and, because the diversionary raids by Italian aircraft were sporadic and ill‑timed, the small boats’ engines had been heard. Even so, the Pig crewed by Tesei and Pedretti was able to reach the St Elmo bridge where, at 0425, true to his word, Tesei detonated the warhead of his torpedo immediately, sacrificing himself and Pedretti ‑but failing to breach the net. To seaward, hearing the explosion, Giobbe ordered the MTMs into the attack.
In the first light of dawn, the MTMs hurled themselves at the still‑intact barrier. In the leading boat, SubLt Roberto Frassetto flung himself clear just before the impact: his MTM struck the netting but failed to detonate. Following him, SubLt Aristide Carabelli remained at the helm until the last, perishing in a massive explosion that seriously wounded the swimming Frassetto, breached the netting and brought down one of the bridge spans, rendering the boat channel impassable. As SubLt Carlo Bosio led in the remaining boats, their path was illuminated by searchlights, and 6‑pounder batteries, Bofors AA guns and machine guns opened up from the shore. Caught in the blocked channel under a savage crossfire, the MTMs were soon sunk; Bosio was killed and the surviving pilots, all wounded, were captured.
As the light improved, some 30 Hawker Hurricanes joined the battle and, although opposed by 10 Macchi C.200 Saetta fighters (which succeeded in shooting down one Hurricane, but lost three of their number) located and attacked the two MTBs and the two smaller motorboats which had been standing by to take off any surviving MTM and Pig crewmen. MAS 451, raked by cannon fire from the Hurricanes, blew up and sank, killing four of her 13‑strong crew. The electric launch was also sunk, and aboard MAS 452, Moccagatta, Giobbe, Falcomata, Parodi and four other men were killed by gunfire. Abandoning MAS 452, 11 survivors succeeded in reaching Diana.
Fifteen men had been killed, among them the senior officers of the 10th Light Flotilla, and 18 captured in the gallant but ineffective action.
Abortive Missions with MTR boats
Thereafter, the MTMs played little part in the 10th Light Flotilla’s activities. The explosive boat concept was adopted by the German Navy and Cdr J. Valerio Borghese (who succeeded Moccagatta in command), remaining faithful to the Axis cause even after Italy’s surrender, passed on his experience to German volunteers.
Before Italy’s collapse, however, two abortive missions were launched with the smaller MTR explosive boats. In mid‑1943, following the Allied invasion of Sicily, it was planned to attack shipping in Syracuse harbour with MTRs. The submarine Ambra (LtCdr Renato Ferrini), carrying three MTRs in the deck cylinders originally designed for the transportation of Pigs, stood off Syracuse on the night of 25 July 1943. But the activities of German U‑boats had put the harbour defences on full alert: picked up on the radars of patrolling aircraft, Ambra was bombed, depth charged, and forced to retire with heavy damage, including the crushing of the MTRs’ cylinders.
A similar mission was planned for 2 October 1943, when the submarine Murena (Cdr Longanesi), equipped with four transportation cylinders, was to launch four MTRs on the Spanish side of Algeciras Bay. The boats were to make their way along the neutral shore and, at 1100 hours, carry out a suicidal daylight attack on merchant shipping at Gibraltar. In the resultant confusion, it was hoped, a Pig launched from the secret base aboard the Olterra would penetrate the military harbour and attack the largest warship in sight. The operation was forestalled by Italy’s surrender on 8 September 1943.
Early MTM-type ramming motorboats during training in 1940-41. These craft had an overall length of about 20ft, a beam of 5ft 6in, and a height of less than 4ft; they could manoeuvre at about 30 knots, making them a small and elusive target, especially after dark. Note the rail around the bow of the further boat, just below the gunwale; when the boat struck, this ‘palmola’ activated a small charge that sank it, and the main charge of around 700lb of high explosive would be detonated by a hydrostatic trigger when it reached a more damaging depth below the target ship’s waterline.
The production of the first series of `barchini’ – `little boats’, the nickname for all such craft – started only in late 1938, with the first six examples delivered in spring 1939. These were of the Motoscafo Turismo (MT) type, translating roughly as `leisure motorboat’ – a designation that seems highly ironic, given their mission.
The first two prototypes of a small fast motorboat to be used for surface assault operations were built in 1936 by the Baglietto Yard of Varazze, and according to the original design a S. 55 seaplane was to have been able to carry one such craft. Very small (4.70m long) and quite fast (32 knots), the prototypes already had the essential characteristics of the forthcoming operational ‘Barchini Esplosivi’, with a 300kg explosive charge in the bow and provisions, i. e. a buoyant chair with a small charge to blow it clear of the craft, to allow the crewman to bail out before impact on the target. The first operational ‘Barchini Esplosivi’ known as Motoscafo Turismo’ (‘MT’ -Sport Motorboats’) followed in late 1939. Two series of ‘MT for a total of eighteen craft were built, and some of them were the first to be employed operationally, with six ‘MT’ attacking Suda Bay (Crete) and damaging HMS York and a tanker on 26 March 1941, and others taking part in the attack against Malta’s Grand Harbour on the night of 26/27 July 1941.
The first boats tested in November 1936 weighed one ton and had a length of 4.7m (15.4ft). It was intended that the boat’s top speed of 32.4 knots would enable it to get close to enemy vessels, avoiding their fire by speed and manoeuvrability, until it could be aimed directly towards the selected target. At the very last moment the pilot would fix the wheel and abandon the boat, which would explode either on contact or, by means of a delay fuse, after the crashed boat and its explosive charges had sunk to a certain depth. (While surviving an attack demanded great courage, judgement and good luck, it must be emphasized that the Italian ramming boats were never intended as kamikaze-style suicide weapons.)
The production of the first series of `barchini’ – `little boats’, the nickname for all such craft – started only in late 1938, with the first six examples delivered in spring 1939. These were of the Motoscafo Turismo (MT) type, translating roughly as `leisure motorboat’ – a designation that seems highly ironic, given their mission. The subsequent MT Modificato (MTM), first tested in November 1940, was 6.1m (20ft) long. Both types could carry a 300-330kg (660-727lb) explosive charge in the bow, at a top speed of 31 knots; the MTM had the important improvement of a special seat-back-cum-life-raft fitted behind the pilot that he used during the `jump’ and while awaiting rescue. Only a dozen or so MTs were produced, but some 40 MTMs. Early in 1941 a reduced-size MT Ridotto was produced; with a height of only 1.14m (3.7ft), they could be carried inside the deck cylinders of carrier submarines without reducing the size of the explosive charge, but in fact they were never used in this way.
Another innovation was the MT Siluranti (MTS), `torpedo motorboat’, a launch armed with one or two small torpedoes, that would have greater manoeuvrability than conventional motor torpedo boats. Available early in 1941, the first examples could reach a top speed of 28 knots with a maximum range of 158km (98 miles), and were armed with two modified 450mm torpedoes. An improved MTS Modificato (MTSM) entered service in spring 1942; this had a top speed of 32-34 knots and a range of 320km (200 miles), although armed with only one torpedo and two 50kg (110lb) bombs. At the time of the Italian surrender just three examples of a new `improved and widened’ MTSM Allargato (MTSMA or SMA) were available; these had a top speed of 29-30 knots and a range of 400km (250 miles) carrying a single torpedo.
The MAS boat itself (Motoscafo Armato Silurante, `armed torpedo motorboat’) saw only limited use by the flotilla, in 1942-45. Up to June 1940, 50 of the Class 500 MAS were built, with another 25 over the following year, in four versions. The Class 500 was 18.7m long by 4.7m in the beam (61.3 x 15.4ft), displacing 22-29.4 tons. It had a crew of 9 to 13, and was armed with two 450mm torpedoes, 6-10 depth charges, and one 13.2mm heavy MG, replaced in 1941 with a Breda 20mm cannon. It had a top speed of up to 44 knots, and a range of between 645km and 1,600km (400-1,000 sea miles).
MAS = Motoscafo Armato Silurante, armed torpedo motorboat
MT = Motoscafo Turismo, lit. ‘leisure motorboat’, actually assault boat
MTL = Motoscafo Trasporto Lento, slow transport motorboat
MTM = Motoscafo Turismo Modificato, improved assault motorboat
MTR = Motoscafo Turismo Ridotto, small assault motorboat
MTS = Motoscafo Turismo Silurante, torpedo motorboat
MTSM = MTS Modificato, improved torpedo motorboat
MTSMA, or SMA = MTSM Allargato, improved, widened torpedo motorboat
- 0081 * MAS 525 l.f.t. 17 m – 1:20
- 0082 * MAS 500 – 2ª serie l.f.t. 18,70 m 1:20
- 0083 * MAS 546 – 549 l.f.t. 18,70 m – 1:20
- 0084 * MAS 550 l.f.t. 18,70 m – 1:20
- 0175 – Autocannoniera S.V.A.N. da 24 metri – 1:20
- 0274 – SILURO A LENTA CORSA “S.L.C.” . l.f.t. 7,30 m – 1:7
- 0306 * SCHNELLBOOT S 38 l.f.t. 34,94 m – 1:25
- 0324 * SCHNELLBOOT S 100 – Tipo “S 26″ l.f.t. 34,94 m – 1:25
- 0327 – MAS S.V.A.N. per difesa costiera – 1:20
- 0328 – MAS 3 (versione cannoniera) l.f.t. 16 m – 1:20
- 0329 – MAS 429 l.f.t. 22 m – 1:20
- 0330 – MAS 430 l.f.t. 16 m – 1:20
- 0331 – MAS R. Marina trasformato S.V.A.N. – 1:20
- 0332 – MAS 427 – 428 l.f.t. 24 m – 1:20
- 0336 * MAS 431 l.f.t. 16 m – 1:10
- 0353 – Mezzo d’assalto “Campini – De Bernardi” – 1:10
- 0355 – M.T.M. Migliorato l.f.t. 6,15 m – 1:5
- 0356 – M.T.S.M.A. – Versioni “A” e “B” l.f.t. 8,77 m – 1:10
- 0985 – S.S.B. l.f.t. 6,70 m – 1:5
- 0986 * S.B.M. l.f.t. 8,47 m 1:10
- 0987 – Battello “R” (Ramognino) 1:5
- 0988 – M.A.T. – M.A. – 1:5
- 0989 – M.T. l.f.t. 5,25 m – 1:5
- 0990 * GAMMA III l.f.t. 5.62 m – 1:5
- 0991 – M.T.M. – 4ª serie l.f.t. 6.11 m – 1:5
- 0992 – M.T.M. – D l.f.t. 6.47 m – 1:5
- 0993 – M.T.R. l.f.t. 6,18 m – 1:5
- 0994 – M.T.S.M. 3ª serie l.f.t. 8,40 m – 1:10
- 0995 – S.M.A. – Versioni “C” e “D” l.f.t. 8,20 m – 1:10
- 0997 * Motoscafo silurante tipo X – 1:20
- 0998 – M.T.L. 3ª serie – 1:5/10
- 1271 – MAS 96 l.f.t. 16,15 m – 1:20
- 0079 * STEFANO TURR l.f.t. 32 m 1:25
- 0080 * MS 11 – 16 21 – 31 l.f.t. 28 m 1:20
- 0085 * MAS 552-553-554 l.f.t. 18,70 m – 1:20
- 0086 * MAS 500 – 3ª serie l.f.t. 18,70 m – 1:20
- 0163 * MAS 500 – 1ª serie l.f.t. 17 m – 1:20
- 0326 – MAS 1 e 2 l.f.t. 16 m – 1:20
- 0333 – Autocannoniera S.V.A.N. da 28 metri – 1:20
- 0334 – MAS 233 – 252 l.f.t. 18 m – 1:20
- 0335 – MAS 432 – 436 l.f.t. 16 m – 1:20
- 0337 * MAS 438 – 441 l.f.t. 22,50 m – 1:15
- 0343 – MAS 15 (versione silurante) – l.f.t. 16 m 1:20
- 0351 – VAS 215 – 220 l.f.t. 28 m – 1:20/25
- 0352 – MS 461 l.f.t. 21,72 m – 1:20
- 0354 – M.T.S. l.f.t. 7,15 m – 1:5
- 0372 – Idroscivolante corazzato – 1:10
- 0385 – MAS da 38 metri con idrovolante – 1:35/50
- 0386 – M.A.S. Motoscafo-Audace-Silurante l.f.t. 12 m – 1:20
- 0389 * Battello di caricamento siluri sui MAS l.f.t. 17 m – 1:25