Naval Historywith Dr. Alex

Q&A · 29:19-31:33

Repairability versus protection in battleship armor belts

An internal belt may offer a marginal protective advantage, but King George V's external belt is much easier to replace after repeated hits weaken a plate.

Damage ControlKing George V Class Battleships (1939)Naval ArmourNaval GunneryWarship Design
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Question

Is an internal armor belt preferable to the external belt used by the King George V class?

Short answer

Internal belts may be marginally stronger initially, but an external belt is much easier to repair after cumulative shell damage.

Notes

An internal armor belt can provide slightly better protection on the first encounter, but repairing damage buried inside the hull is difficult. An external belt can be removed and replaced alongside a pier, returning the ship to full protection more quickly. Armor performance is cumulative rather than a sequence of isolated penetration tests. Several hits close together can crack, distort, and weaken a plate until a later shell penetrates, so repairability after concentrated fire is an operational advantage.