Method for Predicting the Rolling Resistance of Aircraft Tires in Dry Snow

Abstract

A method for predicting the rolling resistance of aircraft tires rolling in dry snow is described. Knowledge about the rolling resistance on a snow-covered surface is required when complying with aircraft certie cation and operational rules, which account for runway surface conditions. In addition to the rules, the Joint Aviation Authorities have issued Advisory Material Joint (AMJ) 25X1591, a document providing information, guidelines, and recommendations for calculating the rolling resistance of aircraft tires in dry snow. The analytical method presented in AMJ 25X1591 gives unsatisfactory results when compared to experimental data. A new method is presented for predicting the rolling resistance due to snow. This new method and the AMJ method are validated by comparing the results of both methods for single tires and full-scale aircraft with available experiments. In general, a much better agreement with experimental data is found for the new method than for the AMJ method.