Diadem-class cruiser

	HMCS Niobe
Class overview
Name	Diadem class
Operators	Royal Navy; Royal Canadian Navy;
Preceded by	Powerful class
Succeeded by	Cressy class
Built	1896–1903
In commission	1898–1925
Completed	8
Retired	8
General characteristics
Type	Protected cruiser
Displacement	11,000 tons
Length	435 ft (132.6 m); (462 ft 6 in (140.97 m) o/a);
Beam	69 ft (21.0 m)
Draught	25 ft 6 in (7.77 m); 27 ft 6 in (8.38 m);
Propulsion	2 shaft triple expansion engines:; 16,500 hp (12,300 kW); (Ariadne, Spartiate, Amphitrite and Argonaut: 18,000 hp (13,000 kW)); Belleville boilers;
Speed	20.25 knots (37.50 km/h; 23.30 mph); (Ariadne, Spartiate, Amphitrite and Argonaut: 20.75 knots (38.43 km/h; 23.88 mph));
Range	2,000 nmi (3,700 km; 2,300 mi) at 19 knots (35.2 km/h; 21.9 mph); (bunker capacity 1900 tons);
Complement	677
Armament	16 × single QF 6-inch (152 mm) guns; 14 × single 12-pounder (76 mm) QF guns; 3 × single QF 3-pounder (47 mm) guns; 2 × 18-inch (450 mm) torpedo tubes (underwater); 8 Maxim machine guns;
Armour	Casemates and gun shields 4.5 in (110 mm); Hoists 2 in (51 mm); Deck 4–2.5 in (102–64 mm); Conning tower 12 in (300 mm) fore ; 6 in (150 mm) tube to fore conning tower; 2 in (51 mm) aft conning tower; Armour was Harvey Nickel steel, except for armoured deck.;

The Diadem-class cruiser was a class of "first class" protected cruiser built for the Royal Navy during the 1890s that served in the First World War. The class consisted of eight ships, built at a cost of around £600,000 each.

They were considered "good sea boats" but criticised for their lack of a heavy calibre main armament, bulky unprotected sides, average speed and lack of manoeuvrability despite being considered large ships when completed. They were the last British first class protected cruisers; the armoured cruiser taking the large cruiser role in future."^[5]

^ ^a ^b ^c Conway's, 1860–1905
^ ^a ^b ^c Cite error: The named reference Janes1900 was invoked but never defined (see the help page).
^ Brassey's (p.220-233) quotes a coal capacity of 1,000 tons.
^ Tony Di Giulian, British 6"/40 (15.2 cm) QF Marks I, II and III
^ Diadem class at worldwar1.co.uk

Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).

[Con-1] Conway's, 1860–1905

[Janes1900-2] Cite error: The named reference Janes1900 was invoked but never defined (see the help page).

[Br-3] Brassey's (p.220-233) quotes a coal capacity of 1,000 tons.

[4] Tony Di Giulian, British 6"/40 (15.2 cm) QF Marks I, II and III

[diaww1-6] Diadem class at worldwar1.co.uk

[1]

[2]

[3]

[4]

[note 1]

[5]

Class overview
HMCS Niobe
Name	Diadem class
Operators	Royal Navy Royal Canadian Navy
Preceded by	Powerful class
Succeeded by	Cressy class
Built	1896–1903
In commission	1898–1925
Completed	8
Retired	8
General characteristics
Type	Protected cruiser
Displacement	11,000 tons^[1]^[2]
Length	435 ft (132.6 m) (462 ft 6 in (140.97 m) o/a)
Beam	69 ft (21.0 m)
Draught	25 ft 6 in (7.77 m) 27 ft 6 in (8.38 m)^[2]
Propulsion	2 shaft triple expansion engines: 16,500 hp (12,300 kW) (Ariadne, Spartiate, Amphitrite and Argonaut: 18,000 hp (13,000 kW)) Belleville boilers
Speed	20.25 knots (37.50 km/h; 23.30 mph) (Ariadne, Spartiate, Amphitrite and Argonaut: 20.75 knots (38.43 km/h; 23.88 mph))
Range	2,000 nmi (3,700 km; 2,300 mi) at 19 knots (35.2 km/h; 21.9 mph) (bunker capacity 1900 tons)^[1]^[3]
Complement	677
Armament	16 × single QF 6-inch (152 mm) guns^[4]^{[note 1]} 14 × single 12-pounder (76 mm) QF guns 3 × single QF 3-pounder (47 mm) guns 2 × 18-inch (450 mm) torpedo tubes (underwater) 8 Maxim machine guns
Armour	Casemates and gun shields 4.5 in (110 mm) Hoists 2 in (51 mm) Deck 4–2.5 in (102–64 mm) Conning tower 12 in (300 mm) fore 6 in (150 mm) tube to fore conning tower 2 in (51 mm) aft conning tower Armour was Harvey Nickel steel, except for armoured deck.^[1]^[2]