SECTION I. INTERNAL-COMBUSTION ENGINE PRINCIPLES 1-7 1-7 II. CLASSIFICATION AND DESCRIPTION OF AIRCRAFT ENGINES 8-14 8-16 III. DESCRIPTION AND CONSTRUCTION OF ENGINE UNITS 15-33 17-49 IV. IN-LINE AIRCRAFT ENGINES 34-38 50-53 V. X-TYPE AIRCRAFT ENGINES 39-43 54-62 VI. OPPOSED- OR FLAT-TYPE AIRCRAFT ENGINES 44-18 63-66 VII. RADIAL AIRCRAFT ENGINES 49-53 67-74 VIII. ENGINE MOUNTS 54-56 75-76 IX STORAGE AND SHIPMENT 57-63 7