Naval Historywith Dr. Alex

Q&A · 2:16:38-2:24:26

K3 and L3 designs as treaty pressure

British 18-inch K3 battlecruisers and L3 battleships would have outclassed existing programmes and intensified Japanese and American pressure for an agreement.

18-inch GunsK3 BattlecruiserL3 BattleshipNaval Arms RaceWashington Naval Treaty
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Question

How would the United States and Japan react if Britain built the 52,000-ton K3 and 51,000-ton L3 designs?

Short answer

Japan would have strong reason to seek a treaty, while the United States would need either a larger building programme or a negotiated limit.

Notes

Choosing the K3 and L3 designs would have left Japan badly out of step with British construction and made a limiting treaty attractive. The United States would face the choice of expanding its own programme or accepting an agreement before the gap widened. Both British designs carried nine 18-inch guns, with the L3 emphasizing battleship protection and the K3 reaching battlecruiser speed. Their heavy armament, angled protection, and scale could influence diplomacy even before keels were laid.