Italy 100 mm/43 (3.9") Model 1927

Description

This weapon was an unsuccessful attempt by OTO to reduce the size of the 100 mm guns for submarine use. Replaced during World War II with standard deck-mounted 100 mm/47 submarine guns.

Gun Characteristics

Designation	100 mm/43 (3.9") Model 1927
Ship Class Used On	Foca and Brin classes
Date of Design	1927
Date In Service	1937
Gun Weight	N/A
Gun Length oa	about 170 in (4.300 m)
Bore Length	N/A
Rifling Length	N/A
Grooves	N/A
Lands	N/A
Twist	N/A
Chamber Volume	N/A
Rate Of Fire	8 - 10 rounds per minute

Ammunition

Type	Fixed
Complete Round Weight	N/A
Projectile Types and Weights	HE: 30.4 lbs. (13.8 kg)
Bursting Charge	N/A
Projectile Length	N/A
Propellant Charge	N/A
Muzzle Velocity	2,625 fps (800 mps)
Working Pressure	N/A
Approximate Barrel Life	N/A
Ammunition stowage per gun	N/A

Range

Range with 30.4 lbs. (13.8 kg) HE
Elevation	Distance
35 degrees	12,000 yards (11,000 m)

Mount/Turret Data

Designation	Single Mountings Submarines (1): Model 1938 (?)
Weight	N/A
Elevation	-5 / +35 degrees
Elevation Rate	Manually operated, only
Train	360 degrees
Train Rate	Manually operated, only
Gun recoil	N/A

Additional Pictures

Click for larger image. — Submarine *Brin* showing the 100 mm/43 (3.9") gun as originally mounted in the conning tower. Note that the gunnery platform rotated, giving maximum working space at any angle of train. Text reads: "Summer 1940 - the 100/43 mm Mod. 1927 of the *Brin* submarine originally installed in the aft part of the conning tower in a traversable protective structure." Photograph source as shown.

Sources

"Naval Weapons of World War Two" by John Campbell
"Italian Warships of World War II" by Aldo Fraccaroli
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Betasom Website Classe Brin (1936) as captured 16 August 2019

Sources

16 May 2006 - Benchmark
11 September 2011 - Corrected typographical error, redid photograph
26 May 2012 - Updated to latest template
17 August 2019 - Converted to HTML 5 format, added photographs of Brin