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| U.S. EXPLOSIVE ORDNANCE |
| PART 2 - ROCKET AND ROCKET FUZES |
| Chapter 5 - ROCKET BODIES |
| Section 4 - NAVY ROCKETS |
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4.5-inch B.R. |
| With Head Mk 3 | |
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Over-all length, inches |
30.0 |
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Total weight, pounds |
28.7 |
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Head length, inches |
13.0 |
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Head weight, pounds |
19.9 |
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Wall thickness, inch |
0.25 |
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Motor length, inches |
15.5 |
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Motor diameter, inches |
2.25 |
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Range, yards |
1,000 - 1,100 |
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TNT charge, pounds |
6.5 |
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Fuze |
Mk 137 or Mk 145 |
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4.5-inch B.R. Assemblies |
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Head |
Filler |
Fuze |
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Mk 3 |
TNT |
Mk 137 |
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Mk 5 |
F.S., W.P. | Mk 137 | ||
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Mk 154 Mod 3 |
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Mk 7* |
F.S., W.P. |
Mk 137 |
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| Mk 154 Mod 3 | ||||
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Mk 3 |
TNT |
Mk 145 |
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Mk 10 |
P.W.P. |
Mk 154 Mod 3 |
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Mk 11 |
TNT |
Mk 137 |
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General: The 4.5-inch barrage rocket is a light demolition rocket intended for laun-ching from landing boats, from amphibious trucks, or from portable launchers of one or more rails. |
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Head: The head and motor are coupled by means of a threaded adapter, and the fuze screws into the nose of the head. The head is cylindrical, the forward and hemis-pherical and the rear end reduced. About 6.5 pounds of high explosive can be loaded through a 2¾-inch hole in the rear, which is sealed later with a motor adapter. The fuze liner, in the nose of the head, contains a booster charge of granular TNT. |
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Tail assembly: Two circular shrouds, the same diameter as the body, are attached to supporting fins at the rear of the motor. Two wires brought out through the powder grain and the nozzle connect to the two shrouds. The forward shroud is insulated from the rest of the rocket to prevent a short circuit to the after grounded shroud. |
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Propellant: The propellant consists of a single cylindrcial grain of ballistite 11 inches long, with a 1.7-inch outer diameter. |
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Figure 130. 4.5-inch B.R. (Head Mk 3) |
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Figure 131. 4.5-inch B.R. (Head Mk 10) |
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