The required maximum speed of 34 knots (63 km/h; 39 mph) meant that the minimum length had to grow from the original 217 m (712 ft) to 229.5 m (753 ft). It also meant that the beam could be a minimum of 25 m (82 ft)—unless diesel engines, like those used in the Deutschland's, were desired; they would increase the beam by 2 m (6.6 ft). Unfortunately for the designers, the widened beam meant that an even longer hull was needed to maintain hydrodynamic efficiency.