Difference between revisions of "Boadicea Class Cruiser (1908)"
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Revision as of 14:26, 16 August 2012
The two scout cruisers of the Boadicea Class were completed by 1910.
| Name | Builder | Laid Down | Launched | Commissioned | Fate |
|---|---|---|---|---|---|
| Bellona | Pembroke Royal Dockyard | 5 June, 1908 | 20 March, 1909 | February, 1910 | Sold 9 May, 1921 |
| Boadicea | Pembroke Royal Dockyard | 1 June, 1907 | 14 May, 1908 | June, 1909 | Sold 13 July, 1926 |
Armament
Guns
This section sourced from The Sight Manual, 1916.[1]
The six 4-in guns were 4-in BL 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 FTP 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 MV.
Open sights do not seem to be in the drawing.
Torpedoes
Fire Control
Rangefinders
Evershed Bearing Indicators
Gunnery Control
Control Positions
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 ARTS 1906, p. 28.
- ↑ absent from list in Handbook of Capt. F.C. Dreyer's Fire Control Tables, 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.
- ↑ Admiralty. Annual Report of the Torpedo School Mining Appendix, 1917-1918, 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.
- Template:BibUKDreyerTableHandbook1918
