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Assault means of the Regia Marina

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Assault means of the Regia Marina Assault means
of the
Regia Marina
Surface Boats
Length
(m)
Length
(m)
Total
weight
(kg)
Total
weight
(kg)
War
load
(kg)
War
load
(kg)
Maximum
speed
(kn)
Maximum
speed
(kn)
Operat+
range
(km)
Operational
range
(km)
Year Year
Tourism Motorboat
(1st and 2nd series) (a)
Length: 5.20 m Total weight: 1,100 kg War load: 330 kg Maximum speed: 33 kn Operational range: 150 km Year: 1936
Modified Tourism Motorboat (b)
Length: 6.11 m Total weight: 1,200 kg War load: 330 kg Maximum speed: 31 kn Operational range: 160 km Year: 1942
Reduced Tourism Motorboat (c)
Length: 6.11 m Total weight: 1,000 kg War load: 333 kg Maximum speed: 29 kn Operational range: 150 km Year: 1942
Torpedo Tourism Motorboat (d)
Length: 7.15 m Total weight: 1,750 kg War load: Two 300-kg torpedoes kg Maximum speed: 28 kn Operational range: 170 km Year: 1939
Modified Torpedo Tourism Motorboat (e)
Length: 8.40 m Total weight: 3,000 kg War load: One 400-kg torpedo + two bombs (f) kg Maximum speed: 32 kn Operational range: 310 km Year: 1941
SMA (g)
Length: 8.80 m Total weight: 3,710 kg War load: One 500-kg torpedo + two bombs (f) kg Maximum speed: 29 kn Operational range: 460 km Year: 1943
Slow Tourism Motorboat (h)
Length: 9.50 m Total weight: 7,300 kg War load: Two SMT kg Maximum speed: 4/5 kn Operational range: 75/110 km Year: 1941
(a) TM: Explosive hulls denominated Tourism Motorboats for secrecy reasons.

(b) MTM: TM with improved and reinforced hull and fitted with a second fuze.

(c) Version of reduced size of the MTM, transportable also on submarines.

(d) TTM: Version of the MTM to support with torpedoes the action of the "barchini" and subsequently retrieve their pilots.

(e) MTTM: Reinforced version of the TTM.

(f) For being launched against ships.

(g) Reinforced version of the MTTM.

(h) Capable of transporting two Slow Moving Torpedoes with silent electric motors (to which an explosion engine was later added) to the vicinity of the operations zone, where it would self sink while the SMT started their mission.
Submarines
Displa+
(t)
Displacement
(t)
Dimens+
(m)
Dimensions
(m)
Prop+ Propulsion Max+
speed
(kn)
Maximum
speed
(kn)
Operat+
range
(km)
Operational
range
(km)
Armament Armament Crew Crew
A class 1st series
Displacement: 13.5/16.4 t Length: 10
Beam: 1.96
Draught: 1.60
Dimensions: length, 10 m; beam, 1.96 m; draught, 1.60 m
Propulsion: Diesel electric Maximum speed: 6.5/5 kn Operational range: 700/57 km Armament: Two 450-mm torpedoes or eight 100-kg explosive charges + 20 "leeches" Crew: 3
A class 2nd series
Displacement: 12.8/14 t Length: 10.47
Beam: 1.90
Draught: 1.83
Dimensions: length, 10.47 m; beam, 1.90 m; draught, 1.83 m
Propulsion: Electric Maximum speed: 6/7 kn Operational range: 70/2 km Armament: Eight 100-kg explosive charges + 20 "leeches" Crew: 3
B class
Displacement: 36/45 t Length: 16
Beam: 3
Draught: 2.10
Dimensions: length, 16 m; beam, 3 m; draught, 2.10 m
Propulsion: Diesel electric Maximum speed: 7.5/7 kn Operational range: 1,450/50 km Armament: Two 450-mm torpedoes Crew: 4
The submarines of the A class were always used as true assault means (it was in construction a perfected type which should have been used for a raid against the port of New York, but it was not completed because it was suspended due to the armistice). Those of the B class were sometimes used as true submarines. Both types could be easily transported through railway.
Ambush Weapons
Slow Moving Torpedo (SMT)
Siluro a Lenta Corsa (SLC)
A 533-millimeter torpedo adapted to small submarines; piloted by two divers who sat straddled on it, the contraption could arrive to the vicinity of an enemy ship by navigating in immersion. Later the operators, after having mined the ship with the explosive head detached from the TML, had the possibility of saving themselves by using the motor section of the TML to move away from the target.
Saint Bartholomew Torpedo (SBT)
Siluro San Bartolomeo (SSB)
Contraption named after the San Bartolomeo torpedo factory based in La Spezia, where it was built. It was a reinforced version of the TML. It never entered service due to the arrival of the armistice.
Explosive Chest
A cylindrical metallic ensemble fitted with 4.5 kilograms of explosive, which could be attached by means of two presses to the anti-roll fins of the target ship. It had a fuze which caused the explosion after a certain time or when the ship had traveled a certain distance. After the British used divers to watch the hulls of the ships which were about to depart, the chests were fitted with contraptions which caused them to explode as soon as someone tried to disassemble them.
"Leech"
A metallic ensemble of biconvex shape containing about two kilograms of explosive. It was adhered to the bottom of the target ship, under which it was placed by means of an elastic ring against which it stayed pushed by a rubber floater inflated by a compressed-air cylinder. The contraption was fitted with a clockwork device.

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