Why did the Royal Navy not adopt the Velox boiler after testing it?
Short answerThe remembered objections are complexity, large space demands, and disappointing practical power density.
NotesComplexity and poor power density are the recalled reasons for the Royal Navy's decision against wider use of the Velox boiler. The Navy did test the system. Although it promised high output, it occupied considerable space inside the hull. That combination made the practical installation less attractive, though the explanation is offered from memory without detailed trial figures.