M15 1915
| Name | No | Builder | Laid down | Launched | Comp | Fate |
| M15 | Gray, Tees | 3/1915 | 28/4/1915 | 6/1915 | sunk 11/11/1917 | |
| M16 | Gray, Tees | 3/1915 | 3/5/1915 | 6/1915 | sold 1/1920 | |
| M17 | Gray, Tees | 3/1915 | 12/5/1915 | 7/1915 | sold 5/1920 | |
| M18 | Gray, Tees | 3/1915 | 15/5/1915 | 7/1915 | sold 1/1920 | |
| M19 | Raylton Dixon, Tees | 3/1915 | 4/5/1915 | 6/1915 | sold 5/1920 | |
| M20 | Raylton Dixon, Tees | 3/1915 | 11/5/1915 | 7/1915 | sold 1/1920 | |
| M21 | Raylton Dixon, Tees | 3/1915 | 27/5/1915 | 7/1915 | sunk 20/10/1918 | |
| M22; 12/1925 - Medea | Raylton Dixon, Tees | 3/1915 | 10/6/1915 | 8/1915 | minelayer 1920, sold for BU 12/1938 | |
| M23 | Raylton Dixon, Tees | 3/1915 | 17/6/1915 | 7/1915 | RNVR drillship Claymore 11/1919, BU 1959 | |
| M24 | Raylton Dixon, Tees | 3/1915 | 9/8/1915 | 10/1915 | sold 1/1920 | |
| M25 | Raylton Dixon, Tees | 3/1915 | 24/7/1915 | 9/1915 | scuttled 16/9/1919 | |
| M26 | Raylton Dixon, Tees | 3/1915 | 24/8/1915 | 10/1915 | sold 1/1920 | |
| M27 | Raylton Dixon, Tees | 3/1915 | 8/9/1915 | 11/1915 | scuttled 16/9/1919 | |
| M28 | Raylton Dixon, Tees | 3/1915 | 28/6/1915 | 8/1915 | sunk 20/1/1918 |
|
Displacement normal, t |
540 |
|
Displacement full, t |
650 |
|
Length, m |
54.0 |
|
Breadth, m |
9.4 |
|
Draught, m |
2.0 - 2.1 |
|
No of shafts |
M15 - 17, 21, 22: 2 M18 - 20, 23 - 28: 4 |
|
Machinery |
M15 - 17, 21, 22: VTE, 2 boilers M18 - 20, 23, 25, 28: 4-cyl. Bolinder semi-diesels M24: 4-cyl. Campbell paraffin engines M26, 27: 2-cyl. Bolinder semi-diesels |
|
Power, h. p. |
M15 - 17: 800 M18 - 20, 23 - 25, 28: 640 M21: 600 M22: 650 M26: 480 M27: 560 |
|
Max speed, kn |
M15 - 17: 11 M18 - 28: 9 |
|
Fuel, t |
45 oil |
|
Armour, mm |
turret: 152 |
|
Armament |
M15 - 18: 1 x 1 - 234/47 BL Mk X, 1 x 1 - 76/50 QF Mk I, 1 x 1 - 57/40 Hotchkiss AA M19 - 28: 1 x 1 - 234/32 BL Mk VI, 1 x 1 - 76/50 QF Mk I, 1 x 1 - 57/40 Hotchkiss AA |
|
Complement |
69 |
Ship project history: Monitors were armed with old 243mm guns from mainly Edgar class cruisers
Protection: information will be added.
Modernizations: M15 and M16 received their 234mm guns at Malta in 7/1915
early 1916, M24, M25: - 1 x 1 - 234/32; + 1 x 1 - 190/50 BL Mk III
early 1916, M26, M27: - 1 x 1 - 234/32; + 1 x 1 - 152/40 QF Mk I or Mk II
later M26: - 1 x 1 - 152/40; + 1 x 1 - 190/50 BL Mk III
later M27: - 1 x 1 - 152/40; + 1 x 1 - 152/45 BL Mk VII
1916 - 1918, M16: - 1 x 1 - 76/50, 1 x 1 - 57/40; + 1 x 1 - 76/45 QF Mk I HA
1916 - 1918, M18, M19, M20, M22: - 1 x 1 - 76/50; + 1 x 1 - 76/45 QF Mk I HA
1916 - 1918, M21, M25: - 1 x 1 - 57/40; + 1 x 1 - 76/45 QF Mk I HA
1916 - 1918, M23, M24, M26, M27: - 1 x 1 - 57/40; + 1 x 1 - 76/45 QF Mk I HA, 2 x 1 - 40/39 pompom
1917, M21, M23: - 1 x 1 - 234/32; + 1 x 1 - 190/50 BL Mk III
1919, M23: - 2 x 1 - 40/39; + 2 x 1 - 47/50 Vickers AA
1919, M24, M26: - 1 x 1 - 76/50; + 1 x 1 - 76/45 QF Mk I HA
1919, M25: + 2 x 1 - 47/50 Vickers AA
1919, M27: - 1 x 1 - 152/45, 1 x 1 - 76/50; + 1 x 3 - 102/45 BL Mk IX, 1 x 1 - 76/45 QF Mk I HA
Naval service: M15 was torpedoed by submarine UC38 in Mediterranean, M21 was mined in La Manche, M25 and M27 were blown up and scuttled by own crews in Dvina River in Northern Russia because evacuation was unavailable, M28 sunk by gunfire of cruisers Goeben and Breslau near Imbros (Aegean).
M16 1915
M23 1918
© Ivan Gogin, 2008-09