One offensive weapons upgrade in 1943 for the Bf 109G — and also used for the Fw 190A — was one that mounted the Werfer-Granate 21 heavy caliber rocket weapon system with one launching tube under each wing panel. The rockets, fitted with a massive 40.8 kg (90 lbs) warhead, were aimed via the standard Revi reflector sights, and were spin-stabilized in flight. In emergency, the tubes could be jettisoned via a small explosive charge. Intended as a “stand-off” weapon, fired from a distance of 1,200 meters and outside the effective range of the formations defensive guns, it was employed against Allied bomber formations, the Wfr. Gr. 21 rocket was unofficially known as the BR 21 (Bordrakete 21 cm) for the Bf 109G-5, G-6 and G-14.
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