Original RAF Air Ministry Air Publication AP1287 (2nd edition, Sept 1928) Lynx IV Aero Engine descriptive handbook Published January 1929. The  Armstrong Siddeley seven cylinder  Lynx IV radial aero engine  as fitted to a number of aircraft including the Avro 504N, Avro Tutor, Avro 626. Great condition with hard covers this manual has many photos, diagrams and tables covering all aspects of this radial engine. £75