Boadicea Class Cruiser (1908): Difference between revisions
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The two [[Scout Cruiser|scout cruisers]] of the '''Boadicea Class''' were completed by 1910. | The two [[Scout Cruiser|scout cruisers]] of the '''Boadicea Class''' were completed by 1910. | ||
==Armament== | ==Armament== | ||
===Guns=== | ===Guns=== | ||
This section sourced from ''The Sight Manual, 1916''. | This section sourced from ''The Sight Manual, 1916''.{{TheSightM|pp. 7, 87, 108, Plate 40}} | ||
The six 4-in guns were 4-in B.L. Mark VII guns on P IV mountings. | The six 4-in guns were 4-in B.L. Mark VII guns on P IV mountings. | ||
| Line 30: | Line 16: | ||
The layer's sight line was 16.8 inches above the bore, and 15 inches left. The trainer's lines were 16.8 inches above and 14.9 inches right. | The layer's sight line was 16.8 inches above the bore, and 15 inches left. The trainer's lines were 16.8 inches above and 14.9 inches right. | ||
The sight lacked a "C" corrector. A number of temperature scale plates corresponding to MVs varying by 25 fps could be shipped with an index facing the actual | The sight lacked a "C" corrector. A number of temperature scale plates corresponding to MVs varying by 25 fps could be shipped with an index facing the actual M.V.. | ||
Open sights do not seem to be in the drawing. | Open sights do not seem to be in the drawing. | ||
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===Torpedoes=== | ===Torpedoes=== | ||
| Line 45: | Line 31: | ||
====Control Positions==== | ====Control Positions==== | ||
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====Control Groups==== | ====Control Groups==== | ||
[[File:FireControlInstruments1909Plate54.jpg|thumb|300px|'''"Scout" class Gun Control Groups''' | [[File:FireControlInstruments1909Plate54.jpg|thumb|300px|'''"Scout" class Gun Control Groups'''{{HFCI1909|Plate 54}} ]] | ||
In 1909, these were described as being similar to the [[Gem Class Cruiser (1903)|Gem class]], but the forecastle and poop guns could be controlled as separate groups or attached to the nearest broadside group on either side. The middle line guns could be connected to whichever side was desired. | In 1909, these were described as being similar to the [[Gem Class Cruiser (1903)|Gem class]], but the forecastle and poop guns could be controlled as separate groups or attached to the nearest broadside group on either side. The middle line guns could be connected to whichever side was desired.{{HFCI1909|pp. 51-52}} | ||
<!-- COPIED FROM GEM CLASS Four groupings were possible for the forward guns: | <!-- COPIED FROM GEM CLASS Four groupings were possible for the forward guns: | ||
| Line 68: | Line 54: | ||
===Torpedo Control=== | ===Torpedo Control=== | ||
In 1907, [[H.M.S. Boadicea (1908)|''Boadicea'']] (and perhaps ''Bellona''), [[H.M.S. Swift (1907)|''Swift'']] and the [[River Class Destroyer (1903)|''River'']] class destroyers were to be equipped with [[Fore Bridge Firing Gear]].{{ARTS1907|p. 31. Its design was detailed in | In 1907, [[H.M.S. Boadicea (1908)|''Boadicea'']] (and perhaps ''Bellona''), [[H.M.S. Swift (1907)|''Swift'']] and the [[River Class Destroyer (1903)|''River'']] class destroyers were to be equipped with [[Fore Bridge Firing Gear]].{{ARTS1907|p. 31. Its design was detailed in ''Annual Report of the Torpedo School, 1906'', p. 28}} | ||
===Transmitting Stations=== | ===Transmitting Stations=== | ||
===Dreyer Table=== | ===Dreyer Table=== | ||
These ships had no fire control tables. | These ships had no fire control tables.{{DreyerH|p. 3}} | ||
===Fire Control Instruments=== | ===Fire Control Instruments=== | ||
[[File:FireControlInstruments1909Plate52.jpg|thumb|300px|'''Fire Control Circuits''' | [[File:FireControlInstruments1909Plate52.jpg|thumb|300px|'''Fire Control Circuits'''{{HFCI1909|Plate 52}} ]] | ||
By 1909, both in this class were outfitted with the latest [[Vickers F.T.P. Fire Control Instruments]] (Mark I in ''Boadicea'', Mark II in ''Bellona''), marking a new wrinkle in equipment by replacing the Barr and Stroud equipment that had taken hold shortly after 1906. The equipment was fitted as follows: | By 1909, both in this class were outfitted with the latest [[Vickers F.T.P. Fire Control Instruments]] (Mark I in ''Boadicea'', Mark II in ''Bellona''), marking a new wrinkle in equipment by replacing the Barr and Stroud equipment that had taken hold shortly after 1906. The equipment was fitted as follows:{{HFCI1909|pp. 57, 60}}{{ARTS1909|p. 148}} | ||
* Range Transmitters: 3 | * Range Transmitters: 3 | ||
* Deflection Transmitters: 3 | * Deflection Transmitters: 3 | ||
| Line 86: | Line 72: | ||
* Vickers Fire Gongs: 6 with 3 keys | * Vickers Fire Gongs: 6 with 3 keys | ||
None of the ships had ''Target Visible'' or ''Gun Ready'' signals. | None of the ships had ''Target Visible'' or ''Gun Ready'' signals.{{HFCI1914|p. 11}} | ||
==Alterations== | ==Alterations== | ||
By November 1918 the two ships along with the two ''Blonde'' class scouts were fitted with rails for 66 mines. The torpedo tubes and guns removed when the mines were shipped could be placed back aboard with enough notice. | By November 1918 the two ships along with the two ''Blonde'' class scouts were fitted with rails for 66 mines. The torpedo tubes and guns removed when the mines were shipped could be placed back aboard with enough notice.{{ARTSMining1917-18|p. 11. Plate 7}} | ||
==See Also== | ==See Also== | ||
{{WP|http://en.wikipedia.org/wiki/Boadicea_class_cruiser}} | |||
==Footnotes== | ==Footnotes== | ||
Revision as of 15:54, 23 September 2012
The two scout cruisers of the Boadicea Class were completed by 1910.
Armament
Guns
This section sourced from The Sight Manual, 1916.[1]
The six 4-in guns were 4-in B.L. Mark VII guns on P IV mountings.
The mounting could elevate to 15 degrees and depress to 10 degrees, but though its sight could match the 15 degree elevation, the range dial was only graduated to 8,500 yards (8.5 degrees) at 2,225 fps. This might have been in obeisance to the Admiralty's stated desire that giving a long-ranged gun to a light cruiser is a guarantee that it will go get in a gunfight and abandon its scouting duties.[Inference][Citation needed]
The gear-worked sights, the first F.T.P. models to be introduced, had a range gearing contant of 42.95 and spiral-reading range dials for 2850 fps, 1-in aiming rifle and .303-in aiming rifle. MV could be corrected (downward only) 200 fps by adjustable scale plate.
The deflection gearing constant was 61.7 with 1 knot equal to 2.74 arc minutes, corresponding to 2824 fps at 3500 yards. Drift was corrected by inclining the sight 2 degrees.
The layer's sight line was 16.8 inches above the bore, and 15 inches left. The trainer's lines were 16.8 inches above and 14.9 inches right.
The sight lacked a "C" corrector. A number of temperature scale plates corresponding to MVs varying by 25 fps could be shipped with an index facing the actual M.V..
Open sights do not seem to be in the drawing.
Control Groups
In 1909, these were described as being similar to the Gem class, but the forecastle and poop guns could be controlled as separate groups or attached to the nearest broadside group on either side. The middle line guns could be connected to whichever side was desired.[3]
Directors
Main Battery
Secondary Battery
Torpedo Control
In 1907, Boadicea (and perhaps Bellona), Swift and the River class destroyers were to be equipped with Fore Bridge Firing Gear.[4]
Transmitting Stations
Dreyer Table
These ships had no fire control tables.[5]
Fire Control Instruments
By 1909, both in this class were outfitted with the latest Vickers F.T.P. Fire Control Instruments (Mark I in Boadicea, Mark II in Bellona), marking a new wrinkle in equipment by replacing the Barr and Stroud equipment that had taken hold shortly after 1906. The equipment was fitted as follows:[7][8]
- Range Transmitters: 3
- Deflection Transmitters: 3
- Range Receivers: 6
- Deflection Receivers: 6
- C.O.S.: 1
- Vickers Fire Gongs: 6 with 3 keys
None of the ships had Target Visible or Gun Ready signals.[9]
Alterations
By November 1918 the two ships along with the two Blonde class scouts were fitted with rails for 66 mines. The torpedo tubes and guns removed when the mines were shipped could be placed back aboard with enough notice.[10]
See Also
Footnotes
- ↑ The Sight Manual. 1916. pp. 7, 87, 108, Plate 40.
- ↑ Handbook for Fire Control Instruments, 1909. Plate 54.
- ↑ Handbook for Fire Control Instruments, 1909. pp. 51-52.
- ↑ Annual Report of the Torpedo School, 1907. p. 31. Its design was detailed in Annual Report of the Torpedo School, 1906, p. 28.
- ↑ Handbook of Captain F. C. Dreyer's Fire Control Tables, 1918. p. 3.
- ↑ Handbook for Fire Control Instruments, 1909. Plate 52.
- ↑ Handbook for Fire Control Instruments, 1909. pp. 57, 60.
- ↑ Annual Report of the Torpedo School, 1909. p. 148.
- ↑ Handbook for Fire Control Instruments, 1914. p. 11.
- ↑ Annual Report of the Torpedo School, Mining Appendix, 1917-18. p. 11. Plate 7.
Bibliography
- Admiralty, Gunnery Branch (1910). Handbook for Fire Control Instruments, 1909. Copy No. 173 is Ja 345a at Admiralty Library, Portsmouth, United Kingdom.
- Admiralty, Gunnery Branch (1918). Handbook of Captain F. C. Dreyer's Fire Control Tables, 1918. C.B. 1456. Copy No. 10 at Admiralty Library, Portsmouth, United Kingdom.
| Boadicea Class Scout Cruiser | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Boadicea Group | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Boadicea | Bellona | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Blonde Group | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Blonde | Blanche | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Active Group | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Active | Amphion | Fearless | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| <– | Sentinel Class | Minor Cruisers (UK) | Bristol Class | –> | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
