[2] This electrically-propelled torpedo was 125 inches (3.175 m) long and weighed 1174 pounds (534 kg).

[2] The torpedo employed a passive acoustic guidance system and was intended for both submarine and surface targets.

[2] Nicknamed "Cutie" [3] by submarine crews, the Mark 27 entered service in 1943 as a defensive weapon.

[2] The Mark 27 was essentially a Mark 24 mine which had been modified for submarine launching in a 21-inch (53 cm) submerged torpedo tube by the addition of 1" (25 mm) wooden guide studs mounted on the torpedo's outer shell.

[1] Fully compatible with electrical setting fire control systems through the use of the standard 65-pin umbilical cable, this weapon was in service on submarines for about ten years.