The gun was mounted longitudinally in the fuselage centreline, at a depressed angle, and had a powerful recoil, which the 27 tonne (30 ton) airframe was able to absorb. The amount of ammunition that could be carried was around 50-60 rounds for the main gun, as well as up to three standard torpedoes or two radio-guided torpedoes (a secret weapon which was never used in combat), and for the defensive wing and fuselage turrets. The 102 mm (4 in) gun was intended to be fitted with a ballistic sight with an analogue computer, and a six or 12 round mechanical loader.