172-0

Nose

Air

Impulse
instantaneous

This is a VT fuze. Used in 5.0" Mk 1 Mod 1 heads for air and ground.

44-1

Nose

Centrifugal
Force

By gas pressure from nose fuze, instantaneous

This is an auxiliary detonating fuze used in 5.0" Mk 10 head with nose fuze Mk 30-3. Fuze is similar to Mk 44 Navy Auxi-liary Detonationg projectile fuze.

44-2

Nose

Centrifugal
Force

By gas pressure from nose fuze, instantaneous

This is an auxiliary Detonating fuze used in 5.0" Mk 7 head with nose fuze Mk 100. The Mk 44-2 differs from the Mk 44-1 in that the hole is drilled through the closing disc and a thin copper disc is used for sealing.

M4A2

Nose

Armed by set-back and creep

Aircraft: In-stantaneous or .015 sec. delay. Ground: In-stantaneous or .1 sec. delay.

Used in 4.5" Rocket heads, M8 and Mods.

M81

Nose

Fuze arms by setback and creep; the booster by cen-trifugal force

Instantaneous or .05 sec. de-lay

Used in 4.5" (M16 head) spin stabilized rockets. Fuze con-sists of M4A2 with M21A1 booster staked in place; the M24 booster may be used as an alternate.

T5

Nose

Air

Impule, instantaneous

This is a VT fuze used in 4.5" (M8 and Mods heads) fin sta-bilized rockets for plane to plane, plane to ground, and plane to water firing. Fuze has self destruction unit to operate in 3 to 6 seconds.

T6

Nose

Air

Impulse, instantaneous

This is a VT fuze used in 4.5" (M8 and Mods heads) fin sta-bilized rockets for ground to ground firing. Fuze differs from T5 in use, arming delay, & has no self destruction unit.

M21A1 (boos-ter)

Nose

Centrifugal
Force

Initiated by action of fuze, instantaneous

Termed a booster by the Army but action is similar to a Navy Auxiliary Detonating Fuze. Booster is staked in the P.D. M4A2 fuze to form the P.D. M81 fuze.

M24 (boos-ter)

Nose

Centrifugal
Force

Initiated by action or fuze, instantaneous

Designed to be used as an al-ternate for the M21A1 booster. See above.