Test running log for Whittle W.1 engine, prefaced by a note 'Engine W1X. Received from B.T-H. Co., Rugby, and installed on cradle in Test House No. 2, Power Jets, Lutterworth, 11th. December 1940'. The log covers comprises details of test runs and subsequent inspections, modifications and repairs, with a total running time of over 63 hours.
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