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Engine – Armstrong Siddeley Cheetah XV
We are not sure of the mark number of this engine as the nameplate was missing on receipt, but it is typical of all the Cheetah engines built by Armstrong Siddeley. One Cheetah engine was built to mark number VA, of 13.65 litres capacity 326bhp at 2,400rpm and a compression ratio of only 5.2:1. Later mark numbers IX, X and XI were supercharged with higher outputs, and the MkX of 13.65 litres developed 335bhp at 2,425rpm to detail just one engine. At the beginning of the 1939-45 war all efforts were made by the makers to produce the Marks IX and X which were urgently required for the Avro Anson and Airspeed Oxford. The Cheetahs became well known for their good reliability and wearing qualities, and were approved by the Air Ministry to operate for no less than 1,200 hours between overhauls – a record for engines of this type.