Portable testing device for measuring static and dynamic drag fractors

摘要

A portable testing device designed to provide slope compensated static and dynamic drag factors. A test material is mounted on a dragging block which is then placed on the test surface. A cable is attached to the dragging block, passed through a foot held pulley device and attached to a rod which protrudes out of an electronics box. The user pulls on the cable while holding onto handgrips attached to the electronics box. This causes the dragging block to be pulled across the test surface. The strain caused by the forces created by the friction between the test surface and the test material is measured using a strain gauge. This strain is used, along with the weight of the dragging block, to determine the slope compensated drag factors.