1 THE MARK 6 DEPTH CHARGE

1. THE MARK 6 depth charge consists of a 300 pound charge of TNT which is fired by a hydrostatically operated pistol through the usual detonator booster train. The Mark 6 pistol has a depth setting range of 30 to 300 feet.

2 THE MARK 6, MOD, 1

2. THE MARK 6 MOD. 1 depth charge is identical to the Mark 6 except that it is fitted with a Mark 6 Mod. 1 pistol which has a depth setting range of 30 to 600 feet.

3 THE MARK 7

3. THE MARK 7 charge is excatly the same as Mark 6 in all prinicpal parts EXCEPT that it has a larger case and contains 600 pounds of TNT instead 300 pounds.

4 THE MARK 7, MOD, 1

4. THE MARK 7, MOD. 1 charge is the same as Mark 7 EXCEPT that it is fitted with the Mark 6 Mod. 1 pistol.

NOTE: The above identifications will apply no matter what booster extender mecha-nism, booster or other parts are used to make up the completed depth charge as-sembly.

SUMMARY

COMPONENTS OR PARTS

5. The above depth charge are made up of the following components:

(a) Case

(b) Charge

(c) Pistol

(d) Detonator

(e) Booster

(f) Booster Extender Mechanism

6. All of these charges measure 27.626 inches long. They DIFFER in weight and in diame-ter of case as follows:

(a) Mark 6 and Mark 6 Mod. 1 each weigh 420 pounds complete-and are 17.625 inches in diameter.

(b) Mark 7 and Mark 7 Mod. 1 each weigh 765 pounds complete-and are 24.875 inches in diameter.

HOW LAUNCHED

7. The Mark 6 and Mark 6 Mod. 1 charges can be dropped from all present types of U.S. Navy depth charge release tracks-and they can be fired from Mark 1 projectors (Y-Guns) and from Mark 6 or Mark 6 Mod. 1 projectors (K-Guns).

8. The Mark 7 and Mark 7 Mod. 1 charges can be dropped from depth charge release tracks Mark 3, Mark 6, Mark 9 and Mods. They CANNOT be fired from types of projectors in service at this time.