This 15 cm Nebelwerfer, formerly known as the Nebelwerfer d, is a six-barreled, breech-loading weapon firing gas, smoke and high-explosive projectiles. The four-foot barrels are not rifled, but have within them three straight guide rails about 1/3 inch deep. The projectile rotates in flight, however, due to the set of the gas jets. There is no breech mechanism, but each barrel has a kind of spring-operated latch to retain the ammunition in position after loading.
The rocket type projectiles are fired electrically by remote control at the rate of one ripple of six rounds in 90 seconds. They are always discharged from the projector in the following barrel order: 1, 4, 6, 2, 3, 5. This is a fixed firing order calculated to prevent the projector from being overturned by blast.
Due to extremely great dispersion, targets of limited area are not engaged.
The carriage is two-wheeled and has a split trail. Fire is directed by forward observers, telescopic observers, and surveying on targets. Each battery has an observer and a fire control officer.
SPECIFICATIONS
| Caliber | 150 mm (5.9 ins.) | |
| Length of barrels | 51 ins. | |
| Rate of fire | 6 rds. per 90 secs. | |
| Range | ||
| 45° | 7,723 yds. | |
| 30° | 7,018 yds. | |
| 6 1/2° | 2,710 yds. | |
| Ammunition | H.E. Shell, Smoke Shell, C.W. Shell | |
| Weight | 1,195 lb. | |
| Traverse | 30° | |
| Elevation | 44° | |
| Velocity | 1,120 f/s |
German: p. 352