under water. Known as the 'dip-chick' method, this attack procedure took about 30 seconds to complete.
The M Class were partial double-hulled submarines with the double-hull extending for about 65% of the length of the boat. A surface speed of 15 knots was attained from two Vickers 12-cylinder diesel engines, each of 1200 bhp. Under water, four double-armature-type main motors, generating 400 bhp each, gave a submerged speed of 9 knots. Power for submerged operations was supplied from three battery tanks containing a total of 336 Exide cells.
The Contrasting Lives of M Class Submarines
The guns used by the M boats came from the Majestic Class
