OP 1664 - U.S. Explosive Ordnance (Vol. 1); Part 1 - Projectiles, Propellants, and Projectile Fuzes; Chapter 3 - Projectile Fuzes; Section 6 - Base Fuzes for Projectiles: Base Detonating Fuze Mk 39 Mod 0 (Obsolete)

U.S. EXPLOSIVE ORDNANCE

PART 1 - PROJECTILES, PROPELLANT,
AND PROECTILE FUZES

Chapter 3 - PROJECTILE FUZES

Section 6 - BASE FUZES FOR PROJECTILES

Base Detonating Fuze Mk 39 Mod 0 (Obsolete)

Projectiles used in

8"/55 H.C.
12"/50 H.C.
14"/45/50 H.C.
16"/45/50 H.C.

This fuze is a modified Base Detonating Fuze Mk 28, the only change being that the springs behind the detents have been made weaker. It is a Mk 28 with the detent springs of a Mk 21. The reason for this change was as follows. At long ranges in major-caliber guns, there was not sufficient centrifugal force to keep the fuze in an armed condition. It was formerly designated the Base Detonating Fuze Mk 28 Sp. and was identified by a green stripe around the body, but this has been replaced by the new Mark number.

This fuze is being replaced by the Base Detonating Fuze Mk 48.