M15-class monitor

	HMS M21
Class overview
Name	M15 class
Operators	Royal Navy
Preceded by	Gorgon class
Succeeded by	M29 class
In service	1915–1959
Completed	14
Lost	4
General characteristics
Type	Monitor
Displacement	540 tons
Length	177 ft 3 in (54.03 m)
Beam	31 ft (9.4 m)
Draught	6 ft 9 in (2.06 m)
Propulsion	2 shafts; Triple-expansion; 800 hp (600 kW); 4 shaft; Bolinder 4-cylinder semi-diesel; 640 hp (480 kW); 4 shafts; Campbell 4-cylinder paraffin engines; 560 bhp (420 kW);
Speed	11 knots (20 km/h; 13 mph)
Complement	69
Armament	1 × BL 9.2-inch (233.7 mm) Mk X gun (M15-M18) or BL 9.2-inch Mk VI gun; 1 × 12-pdr (76mm) QF Mk 1 gun; 1 v 6-pdr (57mm) QF MK 1 AA gun;

The M15 class comprised fourteen monitors of the Royal Navy, all built and launched during 1915.

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