Used in: 4.5-inch Rocket Head Mk 7 and Mk 10 (Smoke)

Overall dimensions and weight of fuze:

Length

Diameter (maximum)

Body threads

Weight

Applicable specification: OS 3577

General arrangement drawing:

423844 (Mod 0)

423847 (Mod 2)

423848 (Mod 3)

Sketch list of drawnings & specs:

109411 (Mod 0)

165110 (Mod 2)

165074 (Mod 3)

Explosive components:

Detonator Mk 23 housed in shutter.

Booster lead-in housed in lead-in disc.

Burster charge (approximately 65 grams of tetryl)

General. Nose Fuze Mk 154 Mod 0, Mod 2, or Mod 3, is identical with Fuze Mk 137 ex-cept a tetryl filled burster tube replaces the booster.

The mods of the fuze differ as follows:

1. Fuze Mk 154 Mod 0 consists of a Fuze Mk 137 Mod 1 with a 14.06-inch long tetryl filled burster tube (0.630-inch diameter) which is rigidly attached to the fuze body.

2. Fuze Mk 154 Mod 1 – Never assigned.

3. Fuze Mk 154 Mod 2 consists of a Fuze Mk 137 Mod 2 with a 14.06-inch tetryl filled burster tube which is rigidly attached to the fuze body.

4. Fuze Mk 154 Mod 3 consists of a Fuze Mk 137 Mod 2 with a 14.06-inch tetryl filled burster tube. Its attachment to the fuze body is such that a certain degree of flexibility is obtained. This is accomplished by a steel retaining collar brazed to the upper end of the burster tube. A rubber gasket is inserted between the burster tube collar and the adapter. Between the wall of the burster tube and the inside wall of the adapter a clear-ance of approximately 0.03 inches exists. This flexibility aids in the assembly of the long fuze into the rocket head burster well when the burster tube is not perfectly concentric with the fuze body threads.

Use. Nose Fuzes Mk 154 Mods 0, 2, and 3 are used in the 4.5-inch Smoke Fin Stabili-zed Surface Rockets (Complete Rounds) Mk 4 Mod 0, Mod 1, and Mod 2 (see OP 1415). These fuzes are designed to detonate a tetryl filled burster tube and distribute the smoke filler of the rocket head on impact with the surface of the ground or water.

Functioning mechanism. (See Fuze Mk 137)

Figure 15 – Nose Fuze Mk 154 Mod 3, External View, Full Size (approximately)
except for Burster Tube Length.

Arming. (Same as Fuze Mk 137).

Firing. (Same as Fuze Mk 137).

Figure 16 – Nose Fuze Mk 154 Mod 3, Cross Section View,
Unarmed Position

Figure 17 – Nose Fuze Mk 154 Mod 3, Cross Section View,
Armed Position

Acceptance test data. Completely live loaded fuzes are selected from each product-ion lot and are installed in 4.5-inch "FS" loaded rocket heads assembled with 2.25-inch Rocket Motors Mk 9 and fired at 45 degrees quadrant angle. Half of the fuzed rounds are fired for ground impact and the other half for water impact. A 90% high order functioning is considered satisfactory. Any premature shall be cause for rejection of the lot.

Same as Fuze Mk 137.

Same as Fuze Mk 137.

No auxiliary booster is present or required in smoke filled rocket heads receiving the Fuze Mk 154. All other installation instructions as related for Fuze Mk 137 are applicable for Fuze Mk 154.

Packing. Fuze are individually packed in hermetically sealed cans. Twenty-four fuzes are packed in a box 23.3 inches by 15 inches by 19.2 inches which represents a total of 3.9 cu. ft. and a total weight of 83 pounds.

Marking. The fuze is marked or stamped to show the letters NF, the mark, mod, and lot number, the manufacturer's initials or symbol, the date of manufacture, the initials or symbol of the loading facility, the month and year of loading, the anchor stamp, and the inspector's initials.