Why Oklahoma's game speed prompts a check of her bulges

Why is Oklahoma limited to 19 knots in the game when 21 knots is expected?

Added bulges without an engine upgrade are proposed as the explanation, and the later inspection identifies bulges on the game's Oklahoma.

Oklahoma's 19-knot game speed prompts an objection that she should make 21 knots. Added bulges without an accompanying engine upgrade are proposed as a way to lose speed. The later examination tries to identify the represented fit from its open 5-inch gun mounts and hull shape. After some confusion with Texas, Oklahoma is described as bulged, supporting that explanation for the slower game model.