Naval Historywith Dr. Alex

Q&A · 2:11:46-2:12:30

Why cross-connected shafts do not replace propulsion redundancy

Cross-connecting machinery can provide options, but a failed drive train may still require shutdown and leave the ship dependent on too few shafts.

Damage ControlMaintenanceNaval ArchitecturePropeller ShaftsPropulsionQueen Elizabeth Class Aircraft Carriers
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Question

Can carrier propeller shafts be cross-connected so that either engine set drives both?

Short answer

Only partly; cross-connection helps, but a failed drive may still need shutdown, so additional complete shafts provide better redundancy.

Notes

A carrier may be able to cross-connect machinery so that either engine set drives both propellers, but each shaft still depends on equipment in its own drive path. A fault may require that drive to be shut down even if power can be routed elsewhere in theory. Cross-connection is useful as an option but should not be the sole answer to failure. Three shafts would retain two complete working paths while one is isolated or maintained.