Q&A ยท 29:35-30:37

Late warships with reciprocating expansion engines

A Second World War frigate, possibly River class, is the tentative candidate, with a qualification about triple versus multistage expansion.

Question

What was the last warship laid down that served with vertical triple-expansion propulsion?

Short answer

Probably a Second World War frigate such as a River-class ship, although the precise ship and expansion-engine terminology remain qualified.

Notes

A Second World War frigate, possibly a River-class ship, is the tentative candidate for the last warship laid down with reciprocating expansion machinery. The precise identification remains uncertain. The machinery terminology also needs qualification: late quadruple or multistage expansion engines differ from VTE, meaning vertical triple expansion.