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| U.S.N.B.D. - ROCKETS AND FUZES |
| ROCKET HEADS |
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U.S. NAVY |
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With Mk 3 Head |
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OVERALL LENGTH |
30.0 in. |
4.5" BARRAGE |
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TOTAL WEIGHT |
28.7 lbs. | |
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HEAD LENGTH |
13.0 in. | |
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HEAD DIAMETER |
4.5 in. | |
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HEAD WEIGHT |
19.9 lbs. | |
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WALL THICKNESS |
0.25 in. | |
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MOTOR LENGTH |
15.5 in. | |
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MOTOR DIAMETER |
2.25 in. | |
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RANGE |
1000-1100 yds. |
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EXPLOSIVE CHARGE (TNT) |
6.5 lbs. | |
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FUZES |
Mk 137 or Mk 145 |
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USE: |
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The 4.5" Barrage Rocket (BR) is a light demolition rocket intended for launching fron landing boats, amphibious trucks or other vehicles where the recoil of guns or mortars would be objectionable and from portable launchers of one or more rails. This rocket is especially valuable in amphibious landing operations to give the attacking forces fire power during the time between cessation of naval shelling and the time when small arms fire become effective (about 600 yds.) |
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4.5" SERVICE BARRAGE ROCKETS |
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Head |
Filler | Motor | Grain | Fuze | Nominal Verlocity |
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Mk 3 |
TNT | 2.25" Mk 9 | Mk 1 | Mk 137 | 355 ft/sec |
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Mk 5 |
FS, WP | 2.25" Mk 9 | Mk 1 | Mk 137 | |
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Mk 154-3 | 355 ft/sec | |||
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Mk 7* |
FS, WP | 2.25" Mk 9 | Mk 1 | Mk 137 | |
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Mk 154-5 | 355 ft/sec | |||
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Mk 3 |
TNT |
2.25" Mk 9 |
Mk 1 |
Mk 145 |
355 ft/sec |
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The Mk 5 was a CIT Production which is replaced by the BuOrd production Mk 7. |
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| *Mk 7 head is longer, giving overall lenght of 37.0" | |||||
| FS - Sulphur trioxide in chlorosulfonic acid | |||||
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WP - White Phosphorous |
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HEAD CONSTRUCTION: |
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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 end hemispheri-cal and the rear end reduced. About 5.5 lbs. of high explosive can be loaded through a 2-3/4" 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 T.N.T. |
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MOTOR: |
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The motor consists of a seamless steel tube fitted with a nozzle at the aft end and sealed by the adapter to the head at the front. |
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TAIL ASSEMBLY: |
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Two circular shrouds, the same diameter as the body, are attached to supporting fins at the rear of the motor. The two shoruds serve to align the round while on the launcher and to stabilize it in flight. 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 prvent a short circuit to the after (grounded) shroud. |
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PROPELLANT: |
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Single cylindrical grain of ballistite 11" long with 1.7" outer diameter. The ballistite is ignited by black powder fired by an electric squib. The burning continue for about 0.3 seconds, during which time the rocket travels about 60 feet. |
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