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Note: This is a sub-section of Avro
Heavy bomber powered by two Rolls-Royce Vulture engines.
The weight of the aircraft increased beyond that originally conceived, and engine output was below expectations. Thus the aircraft was underpowered, making it vulnerable on bombing raids. Worse, the engines were prone to failure.
For an outstanding detailed account of the aircraft and its history, see 'Avro Manchester' by Robert Kirby