Line of Sight Director: Difference between revisions
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==Design== | ==Design== | ||
The circular device was fixed on a stand and in many ways resembled the [[Torpedo Director Pattern 2006]], except that the torpedo | The circular device was fixed on a stand and in many ways resembled the [[Torpedo Director Pattern 2006]], except that the torpedo bar (graduated up to 48 knots) could rotate about the fixed outer ring to any angle of torpedo tube training from 0 to 180 degrees green or red and be clamped into position. | ||
The enemy bar was graduated to 40 knots and the sight | The enemy bar was graduated to 40 knots and the sight bar carried a [[Possible Shot Strip|possible shot strip]] for the torpedo and setting in use. A [[Robinson Disc]] permitted enemy inclination to be read clearly, and an half-disc allowed director angle to be read off, 0 to 90 degrees either side of the torpedo bar.<ref>''Annual Report of the Torpedo School, 1915'', p. 59.</ref> | ||
== | By mid 1917, they had been supplied to light cruisers armed with 21-inch torpedoes as well as to destroyers of [[F Class Destroyer (19XX)|F Class]] and later.<ref>''Handbook of Torpedo Control, 1916'', p. 18.</ref> | ||
==Alterations== | |||
[[File:HandbookTorpedoControlPlate12.jpg|thumb|400px| As altered for deflection sighting by mid 1917.<ref>''Handbook of Torpedo Control, 1916'', Plate 12.</ref>]] | [[File:HandbookTorpedoControlPlate12.jpg|thumb|400px| As altered for deflection sighting by mid 1917.<ref>''Handbook of Torpedo Control, 1916'', Plate 12.</ref>]] | ||
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! colspan=2 | Legend for Deflection Sighting Modifications | ! colspan=2 | Legend for Deflection Sighting Modifications | ||
|- | |- | ||
|A||Circular ring fitted to torpedo | |A||Circular ring fitted to torpedo bar | ||
|- | |- | ||
|B||Deflection ring, locks to A | |B||Deflection ring, locks to A | ||
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|C||Spring locking pin to engage B | |C||Spring locking pin to engage B | ||
|- | |- | ||
|D||Sight | |D||Sight bar and 2 sights | ||
|- | |- | ||
|E||Deflection pointer | |E||Deflection pointer | ||
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|G||Deflection limit stops | |G||Deflection limit stops | ||
|- | |- | ||
|H||Torpedo | |H||Torpedo bar | ||
|- | |- | ||
|J||Torpedo training pointer | |J||Torpedo training pointer | ||
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By mid 1917, in conformance with the Royal Navy's change to deflection sighting, these devices were considerably simplified to work by deflection. | By mid 1917, in conformance with the Royal Navy's change to deflection sighting, these devices were considerably simplified to work by deflection. | ||
The enemy bar, the existing sight bar and both discs were removed. The torpedo bar and its rotation clamp remained in place. A circular ring (A) rode on the torpedo | The enemy bar, the existing sight bar and both discs were removed. The torpedo bar and its rotation clamp remained in place. A circular ring (A) rode on the torpedo bar (H) and carried the rest of the mechanism. A deflection ring (B) rode within the circular ring A and could be locked in any of three positions by a spring catch (C), such that a deflection scale suitable for the torpedo speed in use could be read directly from a pointer (E) on the new sight bar (D) in knots deflection, left or right. Stops (G) could limit the deflection (deviation of sight bar from torpedo bar) for use at night. | ||
The user would verify that he had the correct portion of the deflection scale showing and that the deflection ring (B) was locked into place by the spring catch. The sight | The user would verify that he had the correct portion of the deflection scale showing and that the deflection ring (B) was locked into place by the spring catch. The sight bar would be rotated against friction washer (F) to the desired deflection. The torpedo bar would then be rotated until torpedo pointer (J) matched the tube training angle or the departure angle of the tube and the gyro angle in use.<ref>''Handbook of Torpedo Control, 1916'', pp. 25-26, Plate 14.</ref> | ||
<ref>''Handbook of Torpedo Control, 1916'', pp. 25-26, Plate 14.</ref> | |||
==See Also== | ==See Also== | ||
Revision as of 16:23, 1 April 2011
The Line of Sight Director (sometimes "Torpedo Line of Sight Indicator") was designed around 1915, to be located on a fixed stand on the fore bridge of a destroyer or a light cruiser.[2]
Design
The circular device was fixed on a stand and in many ways resembled the Torpedo Director Pattern 2006, except that the torpedo bar (graduated up to 48 knots) could rotate about the fixed outer ring to any angle of torpedo tube training from 0 to 180 degrees green or red and be clamped into position.
The enemy bar was graduated to 40 knots and the sight bar carried a possible shot strip for the torpedo and setting in use. A Robinson Disc permitted enemy inclination to be read clearly, and an half-disc allowed director angle to be read off, 0 to 90 degrees either side of the torpedo bar.[3]
By mid 1917, they had been supplied to light cruisers armed with 21-inch torpedoes as well as to destroyers of F Class and later.[4]
Alterations
| Legend for Deflection Sighting Modifications | |
|---|---|
| A | Circular ring fitted to torpedo bar |
| B | Deflection ring, locks to A |
| C | Spring locking pin to engage B |
| D | Sight bar and 2 sights |
| E | Deflection pointer |
| F | Spring washer nut |
| G | Deflection limit stops |
| H | Torpedo bar |
| J | Torpedo training pointer |
By mid 1917, in conformance with the Royal Navy's change to deflection sighting, these devices were considerably simplified to work by deflection.
The enemy bar, the existing sight bar and both discs were removed. The torpedo bar and its rotation clamp remained in place. A circular ring (A) rode on the torpedo bar (H) and carried the rest of the mechanism. A deflection ring (B) rode within the circular ring A and could be locked in any of three positions by a spring catch (C), such that a deflection scale suitable for the torpedo speed in use could be read directly from a pointer (E) on the new sight bar (D) in knots deflection, left or right. Stops (G) could limit the deflection (deviation of sight bar from torpedo bar) for use at night.
The user would verify that he had the correct portion of the deflection scale showing and that the deflection ring (B) was locked into place by the spring catch. The sight bar would be rotated against friction washer (F) to the desired deflection. The torpedo bar would then be rotated until torpedo pointer (J) matched the tube training angle or the departure angle of the tube and the gyro angle in use.[6]
See Also
Footnotes
- ↑ Annual Report of the Torpedo School, 1915, Plate 10.
- ↑ The Annual Report of the Torpedo School, 1915, p. 59.
- ↑ Annual Report of the Torpedo School, 1915, p. 59.
- ↑ Handbook of Torpedo Control, 1916, p. 18.
- ↑ Handbook of Torpedo Control, 1916, Plate 12.
- ↑ Handbook of Torpedo Control, 1916, pp. 25-26, Plate 14.
Bibliography
