L3 is described as a 51,100-ton battleship and K3 as a 52,000-ton battlecruiser, both carrying 18-inch guns. The drawings show sixteen 6-inch guns in eight twin turrets, six single anti-aircraft guns tentatively identified as 4.7-inch, four multiple-barrel pom-poms and two large torpedo tubes. L3's quoted machinery output is 70,000 shaft horsepower for 25 knots. K3 requires 144,000 shaft horsepower for 30 knots. That comparison explains why reducing one of these designs to treaty displacement involves a substantial machinery and speed choice alongside the gun and armour reductions.
Notable Point · 30:51-33:24
L3 and K3 shared armament but required very different power
The L3 battleship and K3 battlecruiser studies paired similar weapons with a large increase in machinery power for five extra knots.