Showing papers on "Landing gear published in 1969"

Tire parameters for landing-gear shimmy studies.

Abstract: This paper discusses a tire-test machine, similar to a free-castering landing gear, which allows the determination of tire parameters necessary for accurate prediction of shimmy stability of landing gears. An adequate set of tire parameters is shown to be fei, lateral tire-spring rate; CL, lateral viscous-damping coefficient; C, coefficient of yaw; Ci, yaw time constant; and /Zi, tire torsional spring constant, ki and CL are determined from standing tire-deflection and die-away tests. The rolling tire-test machine is used to determine values for C, Ci, and fJL under simulated high-speed and low-speed taxi runs. Results for two different tires are given (18 X 5.5, 14-ply and 49 X 17, 26-ply). The importance of accurate tire data is demonstrated by showing how stability maps of a typical landing gear vary with changes in tire parameters.

Helicopter skid antenna

Abstract: The struts which are disposed perpendicular to the roll axis of a helicopter for supporting the landing skids thereof are insulated from the helicopter fuselage. One of the struts has an antenna feed at its center, whereby the entire landing gear assembly functions as a folded dipole antenna or a loop antenna, depending on the operating frequency.

Landing gear gravel and water deflector

Abstract: A gravel and water deflector plate for preventing gravel and water, which is energized into motion during operation of the landing gear, from damaging other airplane parts. The plate is mounted in a horizontal plane and surrounds the wheel adjacent the ground or runway. The plate extends in all horizontal directions from the wheel for distances which are sufficient to intercept the upthrown gravel trajectories. In addition, the deflector plate may be a separate operational element or may also be utilized as a closing door for the landing gear well during flight.

Longitudinally movable landing gear for trailers and the like

Abstract: The landing gear for a container chassis frame is movable to and from ground-engaged position and when the bogies for the wheels are to be shifted to different positions on coupled and uncoupled frames, the landing gear may also be shifted to conform to the new position of the wheels.

Landing gear for semitrailers and the like

Abstract: A landing gear for supporting the forward end of a semitrailer and the like after the prime mover or tractor has been removed. The landing gear comprises a pair of support members mounted on opposite sides of the forward end of the trailer and comprising a scissorlike construction which forms a triangular ground supporting portion which can then be collapsed and folded underneath the trailer when not in use.

Airplane retractable landing gear

Abstract: The main landing gear for an airplane includes a pair of retractable wheels The wheels are retracted by hand operation of a lever The landing gear mechanism also includes a pair of air cylinders and a release device which is operated to release the cylinders when the wheels are lowered in water

Flight Planning and Conduct of the X-15A-2 Envelope Expansion Program

Abstract: : After having been extensively damaged during an emergency landing on its thirty-first flight (November 9, 1962), the X-15-2 aircraft was rebuilt and modifications were incorporated to increase the vehicle performance capability to allow flight testing of a hypersonic ramjet engine. The increased performance was derived from additional propellants contained in two external drop tanks. The modified propellant system with the external tanks was satisfactorily developed on a ground test stand and performed adequately during flight. The ablative material developed to protect the aircraft against temperatures exceeding the original aircraft design appeared to perform satisfactorily on the two fully coated flights flown. On the last flight of this aircraft, the vehicle achieved a maximum Mach number of 6.7.

Computer Programs for the Prediction of Aircraft Take-Off Performance on Clay and Sand Airfields

Abstract: : A prediction method for determining wheel sinkage, landing gear drag and takeoff performance on clay and sandy airfields is described. Three computer programs are presented along with computed results of c-141 and C-5 takeoff performance on clay and sand fields of varying soil strengths.

A Steerable Landing Gear for Vehicles with Main Gear Skids

Abstract: Steerable landing gear system consisting of freely castoring corotating wheel nose gear, tiltable axle and main gear skids for lifting body spacecraft

Aircraft Landing Gear-Soils Interaction and Flotation Criteria, Phase 2

Abstract: : The determination of aircraft flotation performance and operations capability on semi- and unprepared soil runways is a critical factor in developing forward area airfields in limited warfare situations. This investigation, which is a part of a continuing effort, was directed at defining landing gear-soil interaction and developing the flotation criteria to permit comparative evaluation of the relative merits of various landing gear configurations.