1,000-pound Aircraft Mine Mk 13 Mod 0, Magnetic Induction; Mk 13 Mod 3, Magne-tic Induction; Mk 13 Mod 4, Magnetic Induction; and Mk 13 Mod 5, Acoustic

Aircraft Mine Mk 13 Type - Data

Over-all length, inches

Diameter, inches

Case

Tail section

Fins on tail section

Explosive filling

Weight of filing, pounds

Total weight, pounds

Charge/weight ratio

Negative buoyancy, pounds

Fuzing for use as mine

Athwartship

Mine mechanisms

Forward well

After well

Fuzing for use as bomb

Nose fuzes AN-M103, AN-M103A1, M135, M135A1, M136, M136A1, M139, M139A1,
AN-M139A1, M140, M140A1, AN-M140A1, M149, M163, M164, M165, AN-Mk 219 (by using adapter ring and one Auxiliary Booster Mk 1

General: The Aircraft Mine Mk 13 Tpye is designed as a ground influence mine, laid offensively by aircraft from altitudes of 100 to 500 feet in 16 to 75 feet of water (40-100 feet for Mk 13 Mod 5) against surface craft and up to 500 feet against submarines. The Aircraft Mines Mk 13 Mods 0, 3, and 4 are magnetic induction mines using the Search Coil Firing Mechanism M4, while the Mk 13 Mod 5 is an acoustic mine utilizing the Acoustic Firing Mechanism A3.

When the mine is dropped as a bomb, the minimum altitude of release is 1,200 feet to insure pilot safety. Because of the shape of the mine, the standard bomb nose fuze re-quire longer air travel to arm.

Mine construction: The body is a cylindrical steel case with a welded hemispherical nose containing a fuze seat liner which houses an adapter ring and two Auxiliary Boosters Mk 1. The cylindrical tail section is of a smaller diameter and is welded to the body. The dome steel tail cover of the Mk 13 Mod 5 is modified to contain the Microphone MI-2; the rubber diaphragm microphone cover of the Mk 13 Mod 5 is stamped with the word "BRUSH". Horizontal suspension is accomplished by either of three sets of lugs placed 45° apart; each set consists of two standard lugs 14 inches apart.

Color: Black over all.

Remarks: The extender and clock starter are activated by hydrostatic pressure at a depth of 16 feet or greater. The clock delay runs off in 45 minutes to arm the mine.

The Aircraft Mine Mk 13 Mod 3 is a Mk 13 Mod 0 fitted with the Tail Parachute Pack Mk 1.

In the Mk 13 Mod 4, the extender and clock starter are modified for shallow-water planting, allowing the mine to function in then feet of water. In other respects the Mk 13 Mod 4 is identical to the Mk 13 Mod 0.

Figure 275. 1,000-pound Aircraft Mine Mk 13