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- W790300786 abstract "SUMMARY Longitudinal, lateral, and heading equations of rollout motion were derived for an aircraft in a three-point attitude equipped with freely castoring or steerable landing gears and subjected to applied forces. Equilibrium constraints normal to the runway surface and about the aircraft roll and pitch axes were imposed. Transient tire forces from steady-sta-te data were introduced by inserting a time lag between the computed tire yaw angle and the resulting tire force. The planar equations derived were used to describe the position and heading of an aircraft relative to a runway coordinate-axis system. Computed trajectories were compared with those found experimentally for a small-scale landing-gear model traversing a laterally sloping runway with and without nose-gear steering. Correlation with experiment was good. Numerical studies indicated that trajectories were sensitive to the initial transla- tory velocities of the test, tire drag, and angular landing-gear misalinement. The effect of the time lag on the computation of the tire forces, however, was found to be negligible for the trajectories of this paper. INTRODUCTION The landing of an aircraEt in a strong crosswind is a difficult and possibly hazardous operation. Crosswind effects have not been as significant in the past because they have been lessened by airport design considerations such as alining runways in the direction of prevailing winds or providing several runways with dif- ferent headings. However, such consideratiahs are not practical €or all airports; and, in particular, airports envisioned for short take-off and landing (STOL) air- craft operations are expected to offer few choices of runway headings. Such runway alinement restrictions potentially expose the aircraft to higher. crosswinds than those currently encountered. Furthermore, the slow landing speeds of STOL-type aircraft make them especially sensitive to crosswinds. Methods are needed to reduce this sensitivity and increase landing flexibility. Landing-gear systems have been conceived to increase control of the aircraft on the ground in the presence of a crosswind, and tests of some crosswind gear concepts using a small model were reported in reference" @default.
- W790300786 created "2016-06-24" @default.
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- W790300786 date "1982-05-01" @default.
- W790300786 modified "2023-09-27" @default.
- W790300786 title "Planar equations of rollout motion for an aircraft with free or steerable landing gears" @default.
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