Slush drag meters

Claim 1

APPARATUS FOR DETERMINING THE DRAG WHICH WOULD BE EXERTED AT A PREDETERMINED SPEED ON AN AIRCRAFT OR LAND-VEHICLE WHEEL BY SLUSH OR WATER LYING ON A SURFACE ON WHICH SAID WHEEL TRAVELS, SAID APPARATUS COMPRISING A MAIN FRAME, A SUB-FRAME PIVOTED TO SAID MAIN FRAME, A TEST WHEEL, MEANS IN SAID SUB-FRAME ROTABLY MOUNTING SAID TEST WHEEL TO BE DISPLACEABLE HORIZONTALLY RELATIVELY TO SAID SUB-FRAME ON SAID TEST WHEEL ENCOUNTERING WATER OR SLUSH LYING ON A SURFACE OVER WHICH SAID TEST WHEEL IS DRIVEN, A SPRING BIASING SAID TEST WHEEL AGAINST HORIZONTAL DISPLACEMENT THEREOF RELATIVE TO SAID SUB-FRAME, SAID SPRING HAVING A PREDETERMINED RATING, A TRANSDUCER COUPLED TO SAID TEST WHEEL TO MEASURE HORIZONTAL DISPLACEMENT THEREOF WHEN SAID TEST WHEEL TRAVELS OVER A SURFACE ON WHICH WATER OR SLUSH IS LYING, SAID TRANSDUCER COMPRISING A POTENTIOMETER HAVING A SLIDER AND BEING CONNECTED IN AN ELECTRICAL CIRCUIT TO PROVIDE SIGNALS PROPORTIONAL TO THE HORIZONTAL DISPLACEMENT OF SAID TEST WHEEL, MEANS COUPLING SAID SLIDER TO SAID TEST WHEEL, AN INTEGRATING COUNTER CONNECTED TO SAID POTENTIOMETER FOR MEASURING OVER A PREDETERMINED TIME INTERVAL THE AVERAGE HORIZONTAL DISPLACEMENT DUE TO DRAG OF SAID TEST WHEEL, AND MEANS COUPLED TO SAID TEST WHEEL FOR MEASURING OVER SAID PREDETERMINED TIME INTERVAL THE DISTANCE TRAVELLED BY SAID TEST WHEEL.