OCR Text |
Show Power Required to Run Cars on Road Surfaces The North Carolina State Highway commission has a specially equipped truck for measuring the power required re-quired to operate vehicles at various speeds and on different road surfaces. Test runs made on a race track, at 15 miles per hour, showed the following results : 10:30 horsepower when the surface was wet and slippery. 9:30 horsepower when the surface was partially dried. 8:50 horsepower when the surface was nearly dry and somewl'at rough. 6:17" horsepower when the surface was in the best of condition, dry and fairly smooth. Tests to determine the effect of speed upon horse power were made when the track was in the best condition. con-dition. These tests showed the following fol-lowing lesults: At a speed of 2 miles per hour, 0:67 horsepower. At a speed of 6 miles per hour, 1:40 horsepower. At a speed of 10 miles per hour, 3:10 horsepower. At a speed of IB miles per hour, 6:17 horsepower. At a speed of 20 miles per hour, 8:10 horsepower. At a speed of 25 miles per hour, 12:45 horsepower. At a speed of 30 miles per hour, 19:00 horsepower. The North Carolina commission proposes pro-poses to continue the tests for a year or more, to determine the comparative compara-tive horse power required at all seasons sea-sons and in all weather on different types of road surface. |