Exactly during WWII The allies built large number of socalled Destroyer escort or DE puposedly built for anti submarine warfare and the size is almost the same as type 56. Theyare small so they can zip in and out from the convoy and hunt the submarine
General description
Full-size
must be able to steam as fast or faster than the fast
such as
and
. This typically requires a speed of 25–35
(46–65 km/h) (dependent upon the era and navy). They must carry
and a smaller caliber of cannon to use against enemy ships, as well as anti-submarine detection equipment and weapons.
A destroyer escort needed only to be able to maneuver relative to a slow convoy (which in World War II would travel at 10 to 12 knots (19 to 22 km/h)), and be able to defend against aircraft and detect, pursue and attack
. These lower requirements greatly reduce the size, cost, and crew required for the destroyer escort. Destroyer escorts were optimized for
, having a tighter turning radius and more specialized armament (such as the forward-firing
mortar) than fleet destroyers. Their much slower speed was not a liability in this context, since
was useless at speeds over 20 knots (37 km/h). Destroyer escorts were also considerably more sea-kindly than
.[
]
General characteristics
Type:
Displacement: 1,360 tons (fully loaded)
Length: 289 ft 6 in (88.2 m) (overall)
Beam: 35 ft (10.7 m)
Draft: 9 ft (2.7 m) (fully loaded)
Propulsion: 4 × GM Model 16-278A diesel engines with electric drive, two propellers of solid manganese bronze 8.5 feet each
Speed: 19 knots (35 km/h; 22 mph) (Many ships were capable of 21–22 knots)
Range: 5,000 mi (4,300 nmi; 8,000 km) at 15 knots (28 km/h; 17 mph)