Magnetic & variations - Aircraft laid

 

♦ Mk 13

Mk 13 was an aircraft-laid magnetic mine, delivered without a parachute. This mine could also be used as a bomb. Total weight was 1048 lb, including 640 lb of TNT, or 1118 lb, including 710 lb of Torpex explosive. Mods 1 and 2 were redesignated Mk 26 Mods 0 and 1 (which was not produced); Mod 3 (with a parachute) was not issued; Mod 4 was designed for shallow water. Mod 5 (990 lb, including 640 lb of TNT, or 1060 lb, including 710 lb of TNT) had an acoustic exploder. Mod 6 (1020 lb, including 640 lb of TNT, or 1090 lb, including 710 lb of TPX) had an acoustic exploder and was fitted with a parachute.

Mk 36 might be considered a development of Mk 13, via Mk 26. Prior to development of the Mk 52 series, Mks 13/36 were the primary U.S. lightweight aircraft-laid bottom mines, and Mk 25 was the primary heavy equivalent. All were exported to U.S. allies postwar.

♦ Mk 25

 

The standard U.S. World War II aircraft-laid bottom mine was exported postwar, and it was used during the Vietnam War. It is no longer in U.S. service (Mod 0 withdrawn in 1970, Mod 2 withdrawn in 1974). Weight was 2000 lb total (1234 lb of TPX or 1200 lb of HBX). Dimensions: 22.4 x 87.2-93 in (depending on flight gear), i.e., roughly the size of the contemporary aerial torpedo Mk 13. In 1980 new flight gear was being issued to permit this mine to be carried at high speeds. Mod 1 was acoustic, Mod 2 pressure/magnetic.

Inert, Drill Mine - The Hunting Mine Mk 25 is a recoverable, inert-loaded shape. It is planted in the water by surface craft solely to help mine countermeasures personnel develop their mine hunting skills and techniques.

The flight gear (shown below) is omitted when the mine is surface planted and is only shown to illustrate how a fully assembled Mine Mk 25 appeared when it was once dropped from aircraft. The mine does not contain explosives or target detecting/actuating mechanisms and, therefore, is ballasted internally with concrete to maintain its necessary negative buoyancy and bottom stability. The mine’s case is painted either white with orange stripes or orange with white stripes.
 

♦ Mk 36

 

Mk 36 was an air-laid bottom mine with a flat slanted nose for optimum underwater trajectory. Mods 0 and 1 were magnetic (induction) mines,- Mod 2 was LF acoustic, and Mod 3 was pres-sure/magnetic. Magnetic version weights: 940 lb (including 570 lb TNT]" or 1008 lb (including 638 lb TPX). Mod 2: 1024 lb (including 570 lb TNT) or 1082 lb (including 638 lb TPX). This mine was exported postwar to allied navies. This mine is no longer in U.S. service (Mods 1 and 3 were withdrawn in 1974, and Mod 2 in 1970).

Inert, Drill Mine - The Hunting Mine Mk 36 is a recoverable, inert-loaded shape that is also planted by surface craft solely to help mine countermeasures personnel develop their mine hunting skills and techniques. In many ways, it is simply a smaller version of the Mine Mk 25.

The mine weighs approximately 1,000 pounds with its tail cover. The flight gear (shown below) is omitted when the mine is surface planted and is only shown to illustrate how a fully assembled Mine Mk 36 appeared when it was once dropped from aircraft. The mine does not contain explosives or target detecting/actuating mechanisms and, therefore, is ballasted internally with concrete to maintain its necessary negative buoyancy and bottom stability. The mine’s case is painted either white with orange stripes or orange with white stripes.

 

 



MINE INDEX PAGE

BACK TO MINEMAN MEMORIES

Derick S. Hartshorn - 2009-present
Last Modified: