| Name | No | Builder | Laid down | Launched | Comp | Fate |
| M29, 12/1925 - Medusa | Harland & Wolff, Belfast | 3/1915 | 22/5/1915 | 6/1915 | minelayer 1/1925, repair ship Talbot 1941, sold for BU 1/9/1946 | |
| M30 | Harland & Wolff, Belfast | 3/1915 | 23/6/1915 | 7/1915 | sunk 14/5/1916 | |
| M31, 12/1925 - Melpomene | Harland & Wolff, Belfast | 3/1915 | 24/6/1915 | 7/1915 | minelayer 1/1921, torpedo instruction vessel 9/1939, BU 1948 | |
| M32 | Workman Clark, Belfast | 3/1915 | 22/5/1915 | 6/1915 | sold 1/1920 | |
| M33, 12/1925 - Minerva | Workman Clark, Belfast | 3/1915 | 22/5/1915 | 6/1915 | minelayer 2/1925, boom defence workshop 11/1943, hulk C23 1944, afloat 1985 |
|
Displacement normal, t |
355 |
|
Displacement full, t |
580 |
|
Length, m |
54.0 |
|
Breadth, m |
9.4 |
|
Draught, m |
1.8 |
|
No of shafts |
2 |
|
Machinery |
VTE |
|
Power, h. p. |
400 |
|
Max speed, kn |
9 |
|
Fuel, t |
45 oil |
|
Armour, mm |
gun shields: 152 |
|
Armament |
2 x 1 - 152/45 BL Mk XII, 1 x 1 - 57/40 Hotchkiss AA |
|
Complement |
72 |
Ship project history: The last 5 small monitors had new 152mm guns removed from aft casemates of Queen ELizabeth class battleships.
Protection: information will be added.
Modernizations: 1919, M31, M33: - 1 x 1 - 57/40; + 1 x 1 - 76/45 QF MkI HA
Naval service: M30 was sunk by Turkish coastal batteries off Smyrna.
M29 1915
Medusa
© Ivan Gogin, 2009