The 21 cm Nebelwerfer 42 rocket had a longer range ( 7,850 metres ( 8,580 yd ) ) and a simpler design than the smaller 15 cm rocket .
Nebelwerfer 42 rocket was introduced in 1942 .
The 21 cm Nebelwerfer 42 rocket , which was introduced in 1942 , had a longer range ( 7,850 metres ( 8,580 yd ) ) and a simpler design than the smaller 15 cm rocket .