Due to stringent anti-noise regulations, it has been proposed to replace the gas turbine en- gine is the classic crime-fighting machine shown in Figure 1 with an internal combustion engine and five-speed manual transmission. The characteristics of the candidate engine are provided in Figure 2. Following standard design practices, determine the gear ratio of each of the five gears as well as the ratio of the final drive, assuming direct drive in the gearbox in the highest gear. Also calculate the speed at which the power required to overcome rolling resistance equals the power required to overcome aerodynamic resistance in still air. Basic vehicle characteristics are provided in Table 1. Also, note the conversions 1 ft lb; = 1.356 Nm and 1 hp = 0.7355 kW. Figure 1: 1966 Batmobile. Table 1: Vehicle parameters. Parameter layout total weight wheelbase tire rolling radius maximum design speed rolling resistance coefficient total driveline efficiency assumed density of air aerodynamic drag coefficient Value front engine / rear drive 2495 kg 3.2 m 0.19 m 200 km/h 0.017 88% 1.23 kg/m 0.45 MECH 4006 CORRECTED TORQUE, LB-FT 340- 320 300 280 260- 240- 220 200- 180 100 Midterm Exam - October, 2019 295LB FT @3000 RPM TORQUE POWER -240 220 -200 180 9 CORRECTED POWER, BHP 120 -100 80 60 140 -40 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 5200 5600 ENGINE SPEED. RPM Figure 2: Internal combustion engine characteristics.