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Technical Paper

26 X 6.6 Radial-Belted Aircraft Tire Performance

1991-09-01
912157
Preliminary results from testing of 26 X 6.6 radial-belted and bias-ply aircraft tires at NASA Langley's Aircraft Landing Dynamics Facility (ALDF) are reviewed. These tire tests are part of a larger, on going joint NASA/FAA/Industry Surface Traction and Radial Tire (START) Program involving three different tire sizes. The 26 X 6.6 tire size evaluation includes cornering performance tests throughout the aircraft ground operational speed range for both dry and wet runway surfaces. Static test results to define 26 X 6.6 tire vertical stiffness properties are also presented and discussed.
Technical Paper

Fore-and-Aft Stiffness and Damping Characteristics of 30 × 11.5 −14.5, Type VIII, Bias-Ply and Radial-Belted Aircraft Tires

1988-10-01
881357
An investigation was conducted to determine the fore and aft elastic response characteristics and footprint geometrical properties of 30 × 11.5 −14.5, Type VIII, bias-ply and radial-belted aircraft tires. Stiffness and damping characteristics of each tire were obtained from load-deflection curves generated from static tests. Tire footprints were obtained for various vertical loads, and geometrical measurements were obtained from the resulting silhouettes. Results of this investigation show considerable differences in stiffness and damping characteristics between the bias-ply and radial-belted tire designs. Footprint geometrical data indicate that footprint aspect ratio effects may interfere with improved hydroplaning potential associated with the radial-belted tire operating at higher inflation pressures. Tire-wheel slippage problems encountered when testing the radial-belted tire design required special attention.
Technical Paper

Shuttle Orbiter Arrestment System Studies

1988-10-01
881361
Scale model studies of the Shuttle Orbiter Arrestment System have been completed. The system was tested with a 1/27.5 scale model at the NASA Langley Research Center and a 1/8 scale model at All American Engineering Company. The purpose of these studies was to determine the proper net arrestment system configuration to bring the Orbiter to a safe stop in the event of a runway overrun with minimal damage. Tests were conducted for centerline engagements and off-center engagements at simulated speeds up to 95 knots full scale. The results of these studies defined the net-orbiter interaction, corrections to prevent underwing engagements, corrections necessary to prevent net entanglement in the main gear, the dynamics of off-centerline engagements, and the maximum number of vertical straps that might become entangled with the nose gear.
Technical Paper

Braking, Steering, and Wear Performance of Radial-Belted and Bias-Ply Aircraft Tires

1992-04-01
921036
Preliminary braking, steering, and tread wear performance results from testing of 26 x 6.6 and 40 x 14 radial-belted and bias-ply aircraft tires at NASA Langley's Aircraft Landing Dynamics Facility (ALDF) are reviewed. These tire tests are part of a larger, ongoing joint NASA/FAA/Industry Surface Traction And Radial Tire (START) Program involving these two different tire sizes as well as an H46 x 18-20 tire size which has not yet been evaluated. Both dry and wet surface conditions were evaluated on two different test surfaces - nongrooved Portland cement concrete and specially constructed, hexagonal-shaped concrete paver blocks. Use of paver blocks at airport facilities has been limited to ramp and taxiway areas and the industry needs a tire friction evaluation of this paving material prior to additional airport pavement installations.
Technical Paper

Static Mechanical Properties of 30 × 11.5-14.5, Type VII, Aircraft Tires of Bias-Ply and Radial-Belted Design

1987-10-01
871868
An investigation was conducted to determine the static mechanical characteristics of 30 × 11.5 - 14.5 bias-ply and radial aircraft tires. The tires were subjected to vertical and lateral loads and mass moment of inertia tests were conducted. Static load deflection curves, spring rates, hysteresis losses, and inertia data are presented along with a discussion of the advantages and disadvantages of one tire over the other.
Technical Paper

Cornering and Wear Characteristics of the Space Shuttle Orbiter Nose-Gear Tire

1989-09-01
892347
Tests of the Space Shuttle Orbiter nose-gear tire have been completed at NASA Langley's Aircraft Landing Dynamics Facility. The purpose of these tests was to determine the cornering and wear characteristics of the Space Shuttle Orbiter nose-gear tire under realistic operating conditions. The tire was tested on a simulated Kennedy Space Center runway surface at speeds from 100 to 180 kts. The results of these tests defined the cornering characteristics which included side forces and associated side force friction coefficient over a range of yaw angles from 0° to 12°. Wear characteristics were defined by tire tread and cord wear over a yaw angle range of 0° to 4° under dry and wet runway conditions. Wear characteristics were also defined for a 15 kt crosswind landing with two blown right main-gear tires and nose-gear steering engaged.
Technical Paper

Aircraft Radial-Belted Tire Evaluation

1990-09-01
901913
An overview is given of the ongoing joint NASA/FAA/Industry Surface Traction And Radial Tire (START) Program being conducted at NASA Langley's Aircraft Landing Dynamics Facility (ALDF). The START Program involves tests using three different tire sizes to evaluate tire rolling resistance, braking, and cornering performance throughout the aircraft ground operational speed range for both dry and wet runway surfaces. Preliminary results from recent 40 x 14 size bias-ply, radial-belted, and H-type aircraft tire tests are discussed. The paper concludes with a summary of the current program status and planned ALDF test schedule.
Technical Paper

Aircraft Landing Dynamics Facility, A Unique Facility with New Capabilities

1985-10-01
851938
The Aircraft Landing Dynamics Facility (ALDF), formerly called the Landing Loads Track, is described. The paper gives a historical overview of the original NASA Langley Research Center Landing Loads Track and discusses the unique features of this national test facility. Comparisions are made between the original track characteristics and the new capabilities of the Aircraft Landing Dynamics Facility following the recently completed facility update. Details of the new propulsion and arresting gear systems are presented along with the novel features of the new high-speed carriage. The data acquisition system is described and the paper concludes with a review of future test programs.
Technical Paper

Comparison of 30X11.5 - 14.5 Bias-ply and Radial-belted Tire Characteristics

1992-10-01
922012
An investigation at NASA Langley Research Center was conducted to determine the static and dynamic mechanical characteristics of 30X11.5-14.5, Type VIII, bias-ply and radial-belted aircraft tires. The tire characteristics were determined by application of vertical and fore-and-aft loads. The results of the study are presented to show static load deflection curves, hysteresis losses, and stiffness and damping characteristics of each tire type tested. The advantages and disadvantages of each type of tire are also given.
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