Sava-class river monitor

The Sava-class river monitors were built for the Austro-Hungarian Navy during the mid-1910s. The two ships of the class were assigned to the Danube Flotilla and participated in World War I. The ships survived the war and were transferred to Romania and the newly created Kingdom of Serbs, Croats and Slovenes (later Yugoslavia) as reparations.

Yugoslav Vardar in 1933
Class overview
Name	Sava
Builders	Stabilimento Tecnico Triestino, Linz
Operators	Austro-Hungarian Navy  Danube Guard  Royal Romanian Navy  Royal Yugoslav Navy  Soviet Navy
Preceded by	Enns class
Succeeded by	Mo. XI class
Built	1914–1915
In service	1915–1946?
Completed	2
Lost	1
Retired	1
General characteristics
Type	River monitor
Displacement	580 tonnes (570 long tons)
Length	62 m (203 ft 5 in)
Beam	10.3 m (33 ft 10 in)
Draught	1.3 m (4 ft 3 in)
Installed power	1,750 ihp (1,300 kW) 2 Yarrow boilers
Propulsion	2 vertical triple-expansion steam engines
Speed	13.5 knots (25.0 km/h; 15.5 mph)
Range	750 nautical miles (Sava, Romanian service, World War II)
Complement	91 officers and enlisted men
Armament	1 × twin 120 mm (4.7 in) L/45 guns 1 × twin 120 mm (4.7 in) L/10 howitzers 1 × twin 66 mm (2.6 in) L/26 guns 2 × single 47 mm (1.9 in) L/44 guns 7 × machine guns (6 in Romanian service) 1 x 610 mm depth charge thrower (in Romanian service)
Armour	Belt and bulkheads: 40 mm (1.6 in) Deck: 25 mm (0.98 in) Conning tower, gun turrets and cupolas: 50 mm (2.0 in)

Description and construction

The ships had an overall length of 62 m (203 ft 5 in), a beam of 10.3 m (33 ft 10 in), and a normal draught of 1.3 m (4 ft 3 in). They displaced 580 tonnes (570 long tons), and their crew consisted of 91 officers and enlisted men.^[1] The Sava-class ships were powered by two triple-expansion steam engines, each driving one shaft, using steam generated by two Yarrow boilers driving.^[1] The engines were rated at 1,750 indicated horsepower (1,300 kW) and were designed to reach a top speed of 13.5 knots (25.0 km/h; 15.5 mph). They carried 75 long tons (76 t) of fuel oil.^[2]

The main armament of the Sava-class river monitors was a pair of 120 mm (4.7 in) L/45^[a] guns in a single turret forward of the conning tower and a pair of 120 mm (4.7 in) L/10 howitzers in the rear turret. They also mounted a pair of 66 mm (2.6 in) L/26 anti-aircraft guns, two 47 mm (1.9 in) L/44 guns, and seven machine guns.^[1] The maximum range of her Škoda 120 mm (4.7 in) L/45 guns was 15 kilometres (9.3 mi).^[3] Her armour consisted of belt and bulkheads 40 mm (1.6 in) thick, deck armour 25 mm (0.98 in) thick, and her conning tower, gun turrets and cupolas were 50 mm (2.0 in) thick.^[1]

Ships

Ship	Builder[1]	Laid down[1]	Launched[1]	Commissioned[1]	Fate
Temes II (Bosna)	Stabilimento Tecnico Triestino, Linz	1914	1915	9 July 1915	Scuttled, 11/12 April 1941[4]
Sava		1915	31 May 1915	15 September 1915	Scrapped in 1959[5]

Careers

In Romanian service, Bucovina (ex-Sava) was fitted for service at sea as an anti-submarine escort, having one of her seven machine guns replaced by one 610 mm depth charge thrower. Otherwise her armament remained unchanged. In Romanian service, she also had a range of 750 nautical miles, more than enough to travel across the greatest East-West extent of the Black Sea, which was 635 nautical miles (the Black Sea was the area of operations of the World War II Romanian Navy).^[6]

Notes

1. L/45 denotes the length of the gun. In this case, the L/45 gun is 45 calibre, meaning that the gun was 45 times as long as the diameter of its bore.