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Handley Page Halifax bomber. ntroduction of 1,390 hp (1,040 kW) Merlin XX engines and a twin .303 in (7.7 mm) dorsal turret instead of waist guns resulted in the B Mk II Series I Halifax. The Mk II Series I (Special) achieved improved performance by removing the nose and dorsal turrets. The Mk II Series IA had a moulded Perspex nose (the standard for future Halifax variants), a four-gun Defiant-type dorsal turret, Merlin 22 engines and larger, trapezoidal-shaped vertical tail surfaces.
Beam gunners inside a Handley Page Halifax. Because of the large gunport openings, the interior of the Halifax could become numbingly cold, especially at 20,000 feet. Gunners wore special electrically heated flight suits which were plugged directly into the aircraft's electrical system. The leads can be seen running over the forward gunner's shoulder.