L9 1920
L23 1939
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| L9 | Denny, Dumbarton | 10.1916 | 29.1.1918 | 5.1918 | sold 6.1927 | ||
| L10 | Denny, Dumbarton | 2.1917 | 24.1.1918 | 6.1918 | sunk 30.10.1918 | ||
| L11 | Vickers, Barrow | 1.1917 | 26.2.1918 | 6.1918 | sold 2.1932 | ||
| L12 | Vickers, Barrow | 1.1917 | 16.3.1918 | 6.1918 | sold 2.1932 | ||
| L14 | Vickers, Barrow | 1.1917 | 10.6.1918 | 10.1918 | sold 5.1934 | ||
| L15 | Fairfield, Govan | 11.1916 | 16.1.1918 | 3/1918 | sold 2.1932 | ||
| L16 | Fairfield, Govan | 11.1916 | 9.4.1918 | 5/1918 | sold 2.1934 | ||
| L17 | Vickers, Barrow | 1/1917 | 13.5.1918 | 9/1918 | sold 2.1934 | ||
| L18 | Vickers, Barrow | 6/1917 | 21.11.1918 | 5/1919 | sold 10.1936 | ||
| L19 | Vickers, Barrow | 7/1917 | 4.2.1919 | 8/1919 | sold 4.1937 | ||
| L20 | Vickers, Barrow | 7.1917 | 23.9.1918 | 1.1919 | sold 1.1935 | ||
| L21 | Vickers, Barrow | 9/1917 | 11.10.1919 | 10/1920 | sold 2.1939 | ||
| L22 | Vickers, Barrow | 11.1917 | 25.10.1919 | 6.1921 | sold 8.1935 | ||
| L23 | 23L, N23 | Vickers, Barrow / Chatham DYd | 8.1917 | 1.7.1919 | 10.1924 | foundered under tow for BU 5.1946 | |
| L24 | Vickers, Barrow | 2.1918 | 19.2.1919 | 2.1920 | collision 14.1.1924 | ||
| L25 | Vickers, Barrow | 2.1918 | 13.2.1919 | 7.1920 | sold 1935 | ||
| L26 | 26L, N26 | Vickers, Barrow / Portsmouth DYd | 1.1918 | 29.5.1919 | 10.1926 | scuttled 9.1946 | |
| L27 | 27L, N27 | Vickers, Barrow / Sheerness DYd | 1.1918 | 14.6.1919 | 3.1926 | sunk as target 25.9.1945 | |
| L28 | Vickers, Barrow | 1918 | --- | --- | cancelled 1919 | ||
| L29 | Vickers, Barrow | 1918 | --- | --- | cancelled 1919 | ||
| L30 | Vickers, Barrow | 1918 | --- | --- | cancelled 1919 | ||
| L31 | Vickers, Barrow | 1918 | --- | --- | cancelled 1919 | ||
| L32 | Vickers, Barrow | 1918 | 23.8.1919 | --- | cancelled 1919, BU 3.1920 | ||
| L33 | Swan Hunter, Wallsend | 9/1917 | 29.5.1919 | 12/1919 | sold 2.1932 | ||
| L34 | Pembroke DYd | 1918 | --- | --- | cancelled 1919 | ||
| L35 | Pembroke DYd | 1918 | --- | --- | cancelled 1919 |
|
Displacement standard, t |
|
|
Displacement normal, t |
890 / 1080 |
|
Length, m |
72.7 |
|
Breadth, m |
7.15 |
|
Draught, m |
4.04 |
|
No of shafts |
2 |
|
Machinery |
2 Vickers diesels / 2 electric motors |
|
Power, h. p. |
2400 / 1600 |
|
Max speed, kts |
17 / 10.5 |
|
Fuel, t |
diesel oil 78 |
|
Endurance, nm(kts) |
3800(10) / 75(4) |
|
Armament |
L9, L16, L18 - 24, L26, 27: 1 x 1 - 102/40 QF Mk IV, 4 - 533 TT (bow, 8), 2 - 450 TT (beam, 2) L10: 1 x 1 - 102/41 QF Mk VII, 4 - 533 TT (bow, 8), 2 - 450 TT (beam, 2) L11, L14, L17: 1 x 1 - 102/40 QF Mk IV, 4 - 533 TT (bow, 8), 16 mines L12: 1 x 1 - 102/41 QF Mk VII, 4 - 533 TT (bow, 8), 16 mines L15: 1 x 1 - 76/45 20cwt QF Mk II, 4 - 533 TT (bow, 8), 2 - 450 TT (beam, 2) L25: 1 x 1 - 102/40 QF Mk IV, 4 - 533 TT (bow, 8), 14 mines L33: 1 x 1 - 102/45 QF Mk XII, 4 - 533 TT (bow, 8), 2 - 450 TT (beam, 2) |
| Electronic equipment | presumably L23, 26, 27: type 113C sonar |
|
Complement |
38 |
| Diving depth operational, m | 50 |
Project history: War experience demanded a heavier bow salvo, and so the second batch of 'L' class was given 4 533mm TT, although the beam 450mm were retained to avoid having to enlarge the hull. The lead boat L9 was ordered in August 1916, followed by L10-35 in December (excluding the 'unlucky' L13). Although it was planned to build L36-49 later, orders were not placed. Five boats were completed as minelayers, along the lines of the 'E' class, with vertical mine-chutes in the saddle tanks. From L12 onwards the 102mm gun was raised to the bridge deck level, where it was served by an enclosed access trunk. This arrangement was intended to permit the 'L's to engage a U-boat out of torpedo-range, with the boat trimmed down. They were a great improvement over the 'E' class, particularly in accommodation. Seven were cancelled in 1918-19.
The main alterations were dictated by the change to 533mm TT. The pressure hull was lengthened by 2.3m and a water-tight bulkhead was added abaft the bow TT to separate the tube compartment from the forward torpedo room. From L18 onwards 78t fuel was carried, an improvement which was retro-fitted to the earlier 'L' class and L9-17. No spare torpedoes were carried for the beam TT.
Modernizations: late 1920s, some survived: + type 113C sonar1942-1944, survived: + type 268W or type 291W radar
1.1946, L23, L26: 1 x 1 - 102/40 P Mk IX, 4 - 533 TT, 2 - 450 TT, type 286W or type 291W radar, type 113C sonar
Naval service: L10 was sunk 24.1.1918 by German destroyers off the Texel. L24 was lost 14.1.1924 as result of collision with battleship Resolution off Portland. Three survived to the end of the Second World War on training duties.
L20
© Ivan Gogin, 2008-15