Tyre Tests and Interpretation of Experimental Data

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Abstract
The test techniques and associated equipment developed for use of the Air Force-Cornell Tire Tester have permitted road tests yielding unique data on the cornering characteristics of pneumatic tyres. Account is given of tests performed for the Dunlop Tire and Rubber Corporation, involving variations of inflation pressure (18 to 45 lb. per sq. in.), camber (±30 deg.), and steer (±30 deg.); these angular ranges are unprecedented. The tyres were nominally 5.00, 6.00, and 7.00 by 16 section, of normal construction but smooth and round to eliminate effects deriving from tread pattern. The ensuing data analysis was based upon familiarity with aircraft derivative notation, the advantages of which are described, and upon simple tyre theory, which is outlined in an appendix. The outstanding conclusions, from a practical standpoint, are (1) that camber thrust strongly affects the static stability of the typical automobile; (2) that the motor cycle operates with negligible slip angle below 35-deg. tilt, whereas above 35-deg. tilt appreciable slip angle must be developed; (3) that a plot of pneumatic trail against side force has great value because of its linearity and ready significance; and (4) that tyre theory should be utilized to permit rational, concise interpretations of empirical data.

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