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Extra resources for Field rocket equipment of the German Army, 1939-1945
When fully assembled the projectile was 144 cm long . The total wl,iqlil varied around 761 Ib (345 kg) . Each rocket was stencilled with its w oi(J111 correct to the nearest 12 Ib (5-436 kg) as this had to be taken into acc(lI"ll when computing ranges. Special range tables were compiled for this purpo,;o. The temperature of the propellant also had to be allowed for, and themJ() meters were issued for this purpose. Extracts from the compiled rang e tnl>l,, :; show the effect of the propellant temperature on the rocket performance .
During World War 2 many new and novel approaches were made into this age-old problem and among these was the use of a delayed action rocket to fire just as the shell's initial velocity was beginning to die away. This principle went into service in the form of the 28 cm Raketen granate 4331 (R Gr 4331) which was fired from the 28 cm K5 (E) railway gun. It increased the gun's not inconsiderable range of 67,800 yards to 93,100 yards-a 37% improvement. The 28 cm R Gr 4331 was a pre-rifled projectile weighing 545% lb.
Previous hollow-charge heads dissipated their energy on striking the plates so that a second weapon was needed to penetrate the armour. The longer nose and design of the Panzer faust 150 bomb overcame this by concentrating the explosive jet and making it more effective. Other changes on the Panzerfaust 150 were increased propellant charges (two) to give a muzzle velocity of 82 metres/second and thus increased range. Another improvement was the addition of an optional fragmentation 58 The early 30 m models were not well received at first by the troops in the field.