BE 150 SS 97
Project #2
Assuming an automobile has the transmission studied in The Gearbox project, a
differential gear ratio of 37:13, and P165/80R13 tires, what is the engine RPM at
65 mph in high gear.
RESULT : Wheel Radius = 11.7 "Diameter = 23.4 " Circumference = 73.5 " = 6.13 ' Car Moves = 65 mi/hr = 95.33 ft/s = 5720 ft/min. 1 sec = 15.56 rev/s = 933.7 rev/min (rpm) Transmission ratio = 1:1 ; in forth gear Engine rpm : 37/13 * 933.7 = 2657.52 rev/min (rpm) |