Accession Number : ADA112187

Title :   Wet Traction Tests - Marcy Siped Tire.

Descriptive Note : Final rept. Aug 77-Sep 79,


Personal Author(s) : Ulrich,Paul C

PDF Url : ADA112187

Report Date : Feb 1982

Pagination or Media Count : 206

Abstract : The purpose of this program was to laboratory test, track test, and evaluate the improvements in viscous hydroplaning or wet surface traction provided by the Marcy siped aircraft tire treads and to determine if this process compromised the tread integrity of the tires. The results of the high speed dynamometer tests indicated that the tread integrity of the F-4 and F-16 main gear tires were not adversely affected by the Marcy tread sipe configuration that were tested. The results of the F-4 tire wet traction laboratory tests and the KC-135 tire track tests indicated significant improvements in lateral force, developed brake torque, and stopping performance for the 1/4 inch deep by 3/16 inch spacing Marcy siped tire tread configuration when compared to a standard (unsiped) tread design. This improvement in wet traction, however, was reduced to a negligible amount when the sipe depth is reduced by tire wear to depths less than 1/8 inch as demonstrated by the wet portland cement track tests. None of the Marcy sipe configurations, however, prevented dynamic hydroplaning when the tires encountered standing water at high speeds during the track tests.

Descriptors :   *Aircraft tires, *Traction, *Hydroplaning, Failure(Mechanics), Water, Stopping, Adverse conditions, Rain, Ice, Weather, Skidding, High velocity, Wear, Laboratory tests, Cements, Tracks, Static tests, Dynamic tests, Performance(Engineering)

Subject Categories : Aircraft
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE