Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Although considered a masterpiece of engine design there were problems with cooling, maintenance, manufacturing and weight. These problems weren't solved during the Dagger's lifetime and went unresolved well into its successor the Napier Sabre's lifetime. The Dagger powered the Hawker Hector army co-operation aircraft and the Handley Page Hereford bomber. The operational usefulness of the Hector was restricted by engine cooling problems, which made it unsuitable for operations in the tropics, and the Hereford was found to be unsuitable for combat because its Dagger VIII engines were noisy and unreliable. The Dagger also found an application in the experimental Martin-Baker MB 2 fighter.

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