FIRST PRINCIPLES OF FLIGHT / AIRCRAFT CONSTRUCTION / NAVIGATION AND METEOROLOGY / AERO-ENGINES / RADIO FOR AEROPLANES. 5 VOLUMES FROM THE "AIR TRAINING SERIES". de Surgeoner, D. Hay

London: Longmans, Green 1.'First Principles of Flight' - 108 pp, 7 1/2" H, new impression September 1941 - b&w illustrations, including sectional diagram of Spitfire on front endpapers. Contents: Introduction; The Atmosphere; Fluid Motion; Aerodynamics; Practical Considerations; Stability; Control; Airscrews; Index. 2. 'Aircraft Construction' - 116 pp, 7 1/2" H, first edition 1942 - many b&w illustrations including double page sectional diagrams of Hurricane (front endpapers), Wellington (rear endpapers) and Spitfire (in main text). Contents: General Considerations; The Aeroplane Structure; The Flying Control System; Materials of Construction; Hydraulic and Pneumatic Systems; Index. 3. 'Navigation and Meteorology' - 108 pp, 7 1/2" H, no date - b&w illustrations. Contents: Preparation; Maps and Charts; Problems of Navigation; Position Fixing; D.R. Navigation; Navigation in Practice; Some Navigational Problems; Instruments; Magnetism and Compasses; Meteorology; Index; Appendix: International Maps Signs. 4. 'Aero Engines' - 110 pp, 7 1/2" H, first edition 1942 - b&w illustrations. Contents: Introductory; The Internal Combustion Engine; Carburation; Supercharging; Ignition; Fuels and Fuel Systems; Lubrication; Engine Construction; Index. 5. 'Radio for Aeroplanes' - 122 pp, 7 1/2" H, no date - b&w illustrations. Contents: Electricity; Magnetism; Alternating Currents; The Alternating Current Circuit; Electromagnetic Waves; The Thermionic Valve; Principles of Transmission; Principles of Reception; Principles of Direction-Finding; Beam Approach; Aircraft Radio Equipment; Index. Each volume has a different colour scheme for the covers, but incorporate the same motif of the side profile of an eagle with wings spread and silhouettes of four airplanes in the background. A sixth book is mentioned on the back of four of these volumes ('How to Fly'), but is not included here. Books are lightly cocked, light browning to edges of text blocks, light edge wear, a few tiny foxing marks on edges of text block of 'Radio for Aeroplanes', tiny bump and tear at bottom of spine of 'Aircraft Construction'. Hard Cover. Good+/No Dust Jackets. Illus. by E. Jeffrey, cover art..