TM 9-1985-6; Types N, N-1, N-2 and N-3 - Mechanical Impact Tail Fuzes

ITALIAN AND FRENCH EXPLOSIVE ORDNANCE

Chapter 2

ITALIAN BOMB FUZES

Types N, N-1, N-2 and N-3 - Mechanical Impact Tail Fuzes

Data

Bombs used in	N - 15-kg S.A.P.
	N-1 - 24-kg G.P.-H.E.
	N-2 - 31-kg S.A.P.
	N-3 - 40-kg G.P.-H.E.
Fuzed used with	Alone
Over-all length	N - Unknown
	N-1 - 10.6 in.
	N-2 - 11 in.
	N-3 - 12.7 in.
Over-all length of vanes	N - Unknown
	N-1 - 1.3 in.
	N-2 - 2 in.
	N-3 - 1.8 in.

Description

These fuzes are nearly similar in outside appearance and have the same type of opera-tion. The type N-3 has a twin firing pin and detonator, the others have onla one. The fuzes are mainly brass, except for steel tube locking balls and creep spring. These fuzes have two safety pin. One locks the striker during shipping, and the other passes through the arming spindle and tube to prevent the vanes from rotating. The two steel balls are prevented from moving inwards by the arming spindle. Type N-3 has a keyway which prevents the striker from turning and keeps the firing pin in line with the detonator.

Operation

The lower safety pin is removed when the bomb is loaded in the plane. When the bomb drops, the upper safety pin is withdrawn, allowing the vanes to rotate. The arming spind-le threads through the brass collar and rises past the steel balls. The balls move inwards, freeing the striker, which now rests on the creep spring. On impact, the firing pin or pins hit the detonator or detonators.

Figure 56
Types N, N-1, N-2 and N-3 - Mechanical Impact Tail Fuzes