Showing papers by "Saab Automobile AB published in 1968"

Numerical lifting-surface theory - Problems and progress.

Abstract: Nomenclature s = semispan t — nondimensional time referred to b/U A — aspect ratio U = reference speed = flight speed B — M — 1 = — 0 w = upwash prescribed by wing motion b = reference length = root semichord X = x — xi c = local semichord Y = y — y\ CL = lift coefficient Z = complex transversal variable = y + iz CM, CN = pitching and yawing moment coefficients, respecx, y, z — nondimensional Cartesian coordinates tively XL, XT = coordinates of the leading and the trailing edge, Cp — pressure coefficient respectively k = reduced frequency = ub/U % = chordwise variable Kp, K(j, = kernel functions relating pressure and upwash and 77 = spanwise variable potential and upwash, respectively

Means for exposing normally covered plate while moving it to exposure situation

Abstract: A specimen plate having a lengthwise slidable cover is placed on a carriage to move therewith into and out of an isolation chamber. A cover holder, movable in and out both relative to the carriage and with it, detachably retains the cover and prevents it from moving with the carriage beyond predetermined limits, so that the specimen plate is slid out of the cover and exposed while moving into the isolation chamber with the carriage, and is slid back into the cover as it is moved out of the isolation chamber.

Adjusting thrust vector of ejection seat rocket motor

Abstract: For adjustment of the direction of its thrust vector, an ejection seat rocket motor is mounted on the ejectable frame element for bodily angular motion, or has an adjustable gas deflector. The seat element, heightwise adjustable on the frame element, has a motion transmitting connection with the rocket motor whereby the thrust vector is maintained in desired relation to the center of gravity of the seat/occupant mass in every position of seat adjustment. At high speeds an airspeed responsive member transiently engages, during ejection, a sensing member associated with said connection, modifying the thrust vector adjustment.

Use of complex cross-flow representation in nonplanar oscillating-surface theory.

Abstract: In the formulation of the nonplanar oscillating-surface problem, a complex variable is introduced instead of the two transversal coordinates. Thereby, a compact relation is obtained between the complex transversal velocity, which replaces the two transversal velocity components, and the chordwise integrals, whose integrands are products of the pressure jump and part of the kernel. A particular approach for numerical evaluation of these integrals is also considered. The remaining spanwise integrals are evaluated through interpolation by the aid of Jacobi polynomials. This interpolation, together with the complex representation, leads to a generalization of the Multhopp procedure. Corresponding integration coefficients are determined by Jacobi's functions of the second kind for complex arguments.

Fluid ejector particularly for cushion levitated devices

Abstract: The nozzle from which primary fluid issues has its axis transverse to a pair of spaced apart wall members. It extends through one of the wall members, in which there are secondary fluid inlet means, and has its mouth spaced from the other wall member so that the latter divergingly deflects the incoming primary fluid.