TM 1-320 Airship Aerodynamics 1941-02-11 Prepared under direction of the Chief of the Air Corps Table of Contents Paragraph Page Section I. General. Paragraph Definition of aerodynamics 1 Purpose and scope 2 Importance 3 Glossary of terms 4 Types of airships 6 Aerodynamic forces 6 II. Resistance. Fluid resistance 7 Shape coefficients 8 Coefficient of skin friction 9 Resistance of streamlined body 10 Prismatic coefficient 11 Index of form efficiency 12 Illustrative resistance problem 13 Scale effect 14 Resistance of completely rigged airship 13 Deceleration test 16 III. Power requirements. Power required to OTercoine airship resistance 17 Results of various speed trials 18 Burgess formula for horsepower 19 Speed developed by given horsepower 20 Summary 21 IV. Stability. Variation of pressure distribution on airship hull 22 Specific stability and center of gravity of airship 23 Center of buoyancy 24 Description of major axis of airship 25 Types of stability 26 Forces and moments acting on airship 27 Damping moment 28 Longitudinal stability 29 Directional stability 30 Lateral stability 31 Summary 32