By W. F. Durand (auth.), William Frederick Durand (eds.)
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Additional resources for Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics
Cular cross sections, it will be exact enough to take the factor k' of the equivalent ellipsoid. For other cases, this factor, then denoted by le', must be multiplied by'Yj, the inertia factor of the cross section, or by its average value over the length. 1) where 'Yj refers to the direction in which the cross sections are moving when rotating. 6. Nose Pressure. The knowledge of the pressure distribution near the bow of airships is of particular importance, especially for ships of the semi-rigid or non-rigid type, because the pressure there reaches its maximum and minimum values, and thus determines the rigidity and strength of the bow stiffening to be provided.
With increasing elongation, the coefficient of additional apparent volume of the ellipsoid decreases towards zero, but only very slowly. 1)] if the maximum diameter is kept constant. The elongation ratio of modern airship hulls is not very different from the ratio alb = 5. The front end is a little blunter than the bow of the equivalent elliptical shape, the rear end somewhat more sharply tapered. Since the volume of apparent additional mass is only a fraction of the hull's own volume, there is no urgent necessity for its precise value.
2) By way of some small increment of lift due to reaction with the wings and representing a partial extension of the wing vortex system about the fuselage 1 . (3) Increase of skin drag and turbulence effects due to action of the propeller, both by way of the increased axial and the rotary components of velocity in the propeller wake. (4) Some small increment of drag due to negative pressure gradient in the propeller wake. The propulsive system, or briefly the propeller will be subject to interference: (1) By way of a slowing down of the inflow air velocity due to the retarding action of the fuselage and wings (or nacelle and wings) immediately behind it, thus producing an increase of thrust, other conditions the same.
Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics by W. F. Durand (auth.), William Frederick Durand (eds.)