Division J Applied Airfoil Theory.- Editor’s Preface.- I. General properties of the wing.- II. Properties of typical profiles.- III. Airfoils or Wings of Finite Span.- IV. Unsymmetrical and Non-Steady Types of Motion.- Division K Airplane Body (Non-Lifting System) Drag and Influence on Lifting System.- Editor’s Preface.- I. Drag of the Body.- II. Parasitic Resistances.- III. Influence of the Airplane Body on the Wings.- Division L Airplane Propellers.- Editor’s Preface.- I. Airscrew Theory.- II. The Axial Momentum Theory.- III. The General Momentum Theory.- IV. Propeller Efficiency.- V. The Blade Element Theory.- VI. The Vortex Theory.- VII. Propellers of Highest Efficiency.- VIII. Body and Wing Interference.- IX. The Experimental Study of Propellers.- X. Helicopter Airscrews.- XI. Windmills and Fans.- XII. Miscellaneous Airscrew Problems.- Division M Influence of the Propeller on Other Parts of the Airplane Structure.- Preface.- I. Development of Theoretical Aspects of the Problem.- II. Applications of Theory and Experimental Results.