Difference between revisions of "Lion Class Battlecruiser (1910)"

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===Mechanical Aid-to-Spotter===
 
===Mechanical Aid-to-Spotter===
At some point, ''Lion'' and ''Princess Royal'' were equipped with two [[Mechanical Aid-to-Spotter Mark I]]s, one on each side of the foretop, keyed off the Evershed rack on the director.  As the need for such gear was apparently first identified in early 1916, it seems likely that these installations were effected well after Jutland.<ref>''The Technical History and Index: Fire Control in HM Ships, 1919'', pp. 25-6.</ref>
+
At some point, ''Lion'' and ''Princess Royal'' were equipped with two [[Mechanical Aid-to-Spotter Mark I]]s, one on each side of the foretop, keyed off the Evershed rack on the director.  As the need for such gear was apparently first identified in early 1916, it seems likely that these installations were effected well after Jutland.{{FCHMShips|pp. 25-6}}
  
 
===Gunnery Control===
 
===Gunnery Control===
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* Forward group on forward director, aft group on directing gun
 
* Forward group on forward director, aft group on directing gun
  
It appears that ''Lion'' had her alternative director fitted in September 1918, and that ''Princess Royal'' may have never had hers installed, though the tower and sights had been delivered.<ref>''The Technical History and Index: Fire Control in HM Ships, 1919'', pp. 18-9.</ref>
+
It appears that ''Lion'' had her alternative director fitted in September 1918, and that ''Princess Royal'' may have never had hers installed, though the tower and sights had been delivered.{{FCHMShips|pp. 18-9}}
  
 
====Secondary Battery====
 
====Secondary Battery====

Revision as of 10:26, 19 September 2012

Radio

According to the ambitions of 1909, these ships had Service Gear Mark II wireless upon completion.[1]

Armament

Main Battery

This section is sourced from The Sight Manual, 1916.[2]

The eight 13.5-in Mark V(L) guns (Mark V (H) in Queen Mary) were in Mark II (or Mark II*) mountings. The sights for Lion and Princess Royal were similar to those in the Orion class. Those in Queen Mary may have more closely resembled those in the the King George V class which also fired the heavier 13.5-in shells. The rest of this section pertains specifically to the Mark V (L) ships.

The sights were limited to 15 degrees elevation, but the central sights had "20 degree super-elevation strips". Additionally, 6 degree super-elevation prisms would have been provided by 1916. The deflection gearing constant was 59.47, with 1 knot equalling 2.51 arc minutes, calculated as 2550 fps at 5000 yards. Range drums were provided for full charge at 2500 fps, three-quarter charge at 2100 fps, as well as 6-pdr sub-calibre gun and .303-in aiming rifle.

Muzzle velocity was corrected by adjustable scale plate between 2560 and 2260 fps. The adjustable temperature scale plate could vary between 40 to 100 degrees Fahrenheit, and a "C" corrector could alter the ballistic coefficient by +/- 20%.

These sights were luxuriously equipped with a cam to correct for drift, which afforded a more precise correction than simply inclining the sight.

The side position sighting lines (parenthetically different in Conqueror) were 41.25 (22.35) inches above and 39 (40.2) inches abreast the bore, and the central scopes were 56.25 (35.85) inches above and 42 (43.5) inches abreast. The left-hand centre position sight was a free trainer's sight, able to swing freely in pitch.

OOQ open director sights capable of 20 degrees elevation had been fitted to Orion by 1916, and the others were to be fitted with them.

A box of tools was provided for every 4 sights.

The hydraulic controls in training were mature; operated by a single handwheel, they could permit continual aim in most conditions. Elevation also seemed to support continual aim well, and the elevation speed was increased slightly from 3 degrees per second in previous mountings.[3]

Secondary Battery

This section is sourced in The Sight Manual, 1916.[4]

The three ships were not identical in their secondary batteries. Lion differed from her sisters in using a different 4-in mounting (P IV*); her particulars are documented on her ship's pagePrincess Royal's configuration is documented here. I am not sure which best describes Queen Marys, but possibly this one.[Inference]

Sixteen 4-in B.L. Mark VII guns on P II* mountings were arranged for broadside fire. They were similar to the P II and P II* equipment fitted in the Bellerophon, Neptune, Indefatigable classes and other ships.

The mounting could elevate 15 degrees and depress 7 degrees, but though its sight could match the 15 degree elevation, the range dial was only graduated to 11.5 degrees (10,000 yards).

These cam-worked sights had range dials for 2750 fps, and 1-in and .303-in aiming rifles. MV could be corrected by adjustable pointer through +/- 150 fps.

Unlike earlier P II* sights such as on Neptune, these sights were F.T.P. sights.

The deflection gearing constant was 64.277 with 1 knot equal to 2.41 arc minutes, corresponding to 2800 fps at 2000 yards. Drift was corrected by inclining the sight 2 degrees.

The layer's sight line was 14 inches above the bore, and 15.25 inches left. The trainer's sight line was 15.25 inches above and 12.5 inches right.

The sight had a temperature corrector, but not a "C" corrector.

The layer had an open sight. The trainer's sight could be used as a free sight with a counterweight.

Torpedoes

The ships had two 21-in submerged broadside tubes forward depressed 2 degrees with the axis of the tube 1 foot 9 inches above the deck.[5]

Torpedo Control

Torpedo control arrangements for Queen Mary were generally similar to those of the King George V. class, except that she lacked a stern torpedo tube.[6]

Fire Control

Range Dials

As of 1920, each surviving ship had two Range Dial Type Bs and a single Type D.[7]

Rangefinders

Lion and Princess Royal were given 9-foot rangefinders in "B" and "X" turrets, and Queen Mary was completed with 9-foot rangefinders in all four turrets — the first capital ship equipped in the lavish pattern that was to be applied to earlier ships in retrofit when possible.[8]

Lion was completed with a 9-ft rangefinder in the forward top dismally situated abaft the forward funnel. It proved untenable, and was moved to a newly added armoured hood atop the conning tower in a refit in 1912. Queen Mary and Princess Royal had the armoured hood from completion.[9][10]

Queen Mary differed by having a 9-ft rangefinder in an armoured hood atop her torpedo control tower aft, whereas the other ships had smaller structure here and an open rangefinder mounting.

Sometime during or after 1917, an additional 15-foot rangefinder on an open mounting was to be added specifically to augment torpedo control.[11] This appears to be visible in a photograph of Lion in 1919 in Weymouth Bay which also appears to show a 15-ft rangefinder on the conning tower and a 9-ft rangefinder on the fore top.[12]

Evershed Bearing Indicators

All units were likely fitted with this equipment by late 1914.[13]

The transmitting positions were

  • Gun control tower
  • Conning tower (transmitters to port and starboard with a local switch to select one in use)
  • "B" turret
  • "X" turret[14]

The protocols for how her crew should handle wooding of the turrets was outlined in the Handbook for Fire Control Instruments, 1914.[15]

Mechanical Aid-to-Spotter

At some point, Lion and Princess Royal were equipped with two Mechanical Aid-to-Spotter Mark Is, one on each side of the foretop, keyed off the Evershed rack on the director. As the need for such gear was apparently first identified in early 1916, it seems likely that these installations were effected well after Jutland.[16]

Gunnery Control

Queen Mary differed from her sisters by mimicking King George V whereas Lion and Princess Royal were likened to Orion.[17] The control arrangements were likely as follows, with some inferences being drawn due to fundamental differences between these ships and their dreadnought archetypes.

Control Positions

  • Control top (for Lion and Princess Royal)
  • Gun control tower
  • "B" turret
  • "X" turret[18]

Some ships had C.O.S.es within the control positions so they could be connected to either TS.[19] It is not clear if this applied to Lion and Princess Royal.

Control Groups

The four 13.5-in turrets were separate groups, each with a local C.O.S. so that it could be connected to

  • Forward T.S.
  • After T.S.
  • Local control from officer's position within turret

Directors

Main Battery

At some point, the ships were fitted with a cam-type tripod-mounted director in a light aloft tower on the foremast along with a directing gun (in "Y" turret?).[20] The battery was divisible into forward ("A" and "B") and aft ("Q" and "Y") groups, and a C.O.S. in the TS allowed the following modes of control:[21]

  • All turrets on aloft director
  • All turrets on directing gun
  • Forward group on aloft, aft group on directing gun

In May, 1917, in recognition of shortcomings in the use of directing guns, it was ordered that Lion and Princess Royal should be fitted with a second tripod-type director aft,[22] at which time they would have been fitted with a 5-way C.O.S., possibly in the manner:[23]

  • All turrets on forward aloft director
  • All turrets on aft director
  • All turrets on directing gun
  • Forward group on forward director, aft group on aft director
  • Forward group on forward director, aft group on directing gun

It appears that Lion had her alternative director fitted in September 1918, and that Princess Royal may have never had hers installed, though the tower and sights had been delivered.[24]

Secondary Battery

The 4-in broadside guns are not listed as ever having had directors installed.[25]

Torpedo Control

Alternative Torpedo Director Position proposed c1911
In 1911, it was decided to equip the ships (or possibly just Queen Mary[26]) with hoods situated near the broadside tubes.[27]

The ships were to have had small armoured hoods added around 1911-12 which would enjoy frontal protection from the ship's side armour and obviate the need for tangent bars on the torpedo director. A 4-inch embrasure as drawn here gave a line of sight from 70 degrees before to 80 degrees abaft the line of the tube, but this was later modified before construction to do 80 degrees on either side of the tube. Hinged shutters allowed the embrasure to be closed when not in use, and the stand for the director could be swiveled to match any gyro angle in use at the tube.[28] There is no evidence that this work was ever undertaken. Iron Duke was completed with such hoods in place, and they were vacated in favor of the CT after testing revealed they were too susceptible to blast from the guns.[Citation needed]

By mid 1917 and likely a considerable time before,[Inference] Lion and Princess Royal were provided a Torpedo Control Plotting Instrument Mark I in the TCT. It is not certain that Queen Mary was so equipped at the time of her loss, but it seems likely.[Inference][29]

Transmitting Stations

Like most previous large British ships of the era, Lion and Princess Royal[30] had 2 TSs, but Queen Mary established the new pattern of using a single TS[31].

Dreyer Table

At the Battle of Jutland, Lion and Princess Royal carried the Mark III Dreyer Tables[32] they were completed with,[33] while Queen Mary was using a Mark II Dreyer Table when she was destroyed.[34][35]

Sometime prior to 1919, Lion and Princess Royal had been upgraded to Mark IV* Dreyer Tables, but seemingly did not have any Dreyer Turret Control Tables installed at the time when Tiger and later battlecruisers received some.[36]

Fire Control Instruments

Vickers F.T.P. Mark III instruments sent range and deflection data to gun sights (likely with cross-connected Mark III* range transmitters[37]), and Barr and Stroud (probably Mark II*[Inference]) instruments used elsewhere.[38]

Gun Ready signals mounted in the T.S.(es) and control positions indicated which which guns were ready.[39]

Lion and Princess Royal also had Target Visible signals mounted in their T.S.es and control positions to indicated which turrets could see the target. Queen Mary and later ships lacked this equipment.[40]

See Also

Footnotes

  1. ARTS 1908 Wireless Appendix, p. 13.
  2. The Sight Manual, 1916, pp. 4, 29-31, 106, 109.
  3. Brooks. Dreadnought Gunnery and the Battle of Jutland, pp. 45-46.
  4. The Sight Manual, 1916, pp. 89-90, 108, Plate 39.
  5. Addenda (1911) to Torpedo Manual, Vol. III., 1909, p. 155.
  6. Annual Report of the Torpedo School, 1913. p. 63.
  7. Manual of Gunnery of H.M. Fleet, Volume III, 1920, p. 44.
  8. Roberts. Battlecruisers, pp. 91-92.
  9. Burt. British Battleships, pp 151, 152, 154.
  10. Roberts. Battlecruisers, p. 35.
  11. Annual Report of the Torpedo School, 1917. p. 198. (C.I.O. 481/17).
  12. Burt. British Battleships, Photo page 162.
  13. Handbook for Fire Control Instruments, 1914, p. 37.
  14. Handbook for Fire Control Instruments, 1914, pp. 7-8, 37.
  15. Handbook for Fire Control Instruments, 1914, p. 37.
  16. The Technical History and Index, Vol. 3, Part 23. pp. 25-6.
  17. Handbook for Fire Control Instruments, 1914, p. 8.
  18. Handbook for Fire Control Instruments, 1914, pp. 7-8, 37.
  19. Handbook for Fire Control Instruments, 1914, p. 7.
  20. The Director Firing Handbook, 1917. pp. 88, 142.
  21. The Director Firing Handbook, 1917. p. 88.
  22. The Technical History and Index: Fire Control in HM Ships, p. 18.
  23. The Director Firing Handbook, 1917. p. 88.
  24. The Technical History and Index, Vol. 3, Part 23. pp. 18-9.
  25. The Director Firing Handbook, 1917. pp. 143.
  26. The Annual Report of the Torpedo School, 1911, p. 43
  27. Annual Report of the Torpedo School, 1911. Plate 14.
  28. Annual Report of the Torpedo School, 1911. p. 43.
  29. Handbook of Torpedo Control, 1916, p. 38. Inferences based on Mark II gear being in place in other ships in 1915.
  30. Admiralty. Battle of Jutland: Official Despatches, p. 387.
  31. Handbook for Fire Control Instruments, 1914, pp. 6-7.
  32. Sumida, Jon. In Defence of Naval Supremacy, p. 300.
  33. Brooks, John. Dreadnought Gunnery and the Battle of Jutland, p. 8.
  34. Sumida, Jon. In Defence of Naval Supremacy, p. 252.
  35. Brooks, John. Dreadnought Gunnery and the Battle of Jutland, p. 166.
  36. Handbook of Capt. F.C. Dreyer's Fire Control Tables, p. 3.
  37. Annual Report of the Torpedo School, 1910. p. 148.
  38. Handbook for Fire Control Instruments, 1914, pp. 72.
  39. Handbook for Fire Control Instruments, 1914, p. 11.
  40. Handbook for Fire Control Instruments, 1914, p. 11.

Bibliography


Lion Class Battlecruiser
  Lion Princess Royal Queen Mary  
<– Indefatigable Class Major Cruisers (UK) H.M.S. Tiger –>