Took it from wikipedia info:
'From 1939 onwards, torpedoes were carried externally, as were larger bombs, when two hardpoints were fitted under the inner wing.
[12] Theoretically,
two torpedoes could be carried, but the performance and the manoeuvrability of the aircraft were so reduced that usually only one was carried. The SM.79's overall payload of 3,800 kg (8,400 lb) precluded carrying 1,600–1,860 kg (3,530–4,100 lb) of bombs without a noticeable reduction of the fuel load (approximately 2,400 kg (5,300 lb), when full).
[12] The standard torpedo, a 1938
Whitehead design, had a weight of 876 kg (1,931 lb), length of 5.46 m (17.9 ft) and a 170 kg (370 lb) HE warhead. It had a 3 km (1.9 mi) range at 74 km/h (40 kn), and could be launched from a wide range of speeds and altitudes: 40–120 m (130–390 ft) and up to 300 km/h (190 mph) maximum.
[15] It took over ten years to develop effective torpedo-bombing techniques; consequently, with the failure of the
SM.84 (its intended successor) and the lack of power of the
Ca.314, only the SM.79 continued to serve as a torpedo bomber until 1944, despite trials with many types of aircraft, including the
Fiat G.55S.'
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