Mark 39 torpedo explained

Mark 39 torpedo
Origin:United States
Type:ASW Homing torpedo
Is Ranged:yes
Is Explosive:yes
Is Missile:yes
Service:1946-1956
Used By:United States Navy
Designer:Vitro Corporation
Ordnance Research Laboratory, Pennsylvania State University
Manufacturer:Philco
Design Date:1946
Weight:1725 pounds
Length:133 inches
Diameter:19 inches
Range:1300 yards
(26-minute search duration)
Filling:Mk 39 Mod 0, HBX
Filling Weight:130 pounds
Detonation:Mk 19 Mod 10 contact exploder
Engine:Electric
Speed:15.5 knots
Guidance:Wire
Launch Platform:Submarines

The Mark 39 torpedo was the first homing torpedo in United States Navy service to use a trailing wire for mid-course guidance through the submarine's fire control system. The Mark 39 was a Mark 27 Mod 4 torpedo converted for development of wire guidance techniques, which were eventually incorporated into the Mark 37 Mod 1 and the Mark 45. Due to this development, the Mark 39 was considered obsolete and the remaining inventory was scrapped.