german type viic/41 submarines were preceded by the heavier type viic submarines. "u-1304" had a displacement of when at the surface and while submerged. she had a total length of , a pressure hull length of , an overall beam of , a height of , and a draught of . the submarine was powered by two germaniawerft f46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two aeg gu 460/8-276 double-acting electric motors producing a total of for use while submerged. she had two shafts and two propellers. the boat was capable of operating at depths of up to .