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126Vehicle gear 1st 1st 2nd 2nd 3rd 3rd 4th 4th 5th 5thOverall gear ratio 13.66 13.66 7.18 7.18 4.73 4.73 3.45 3.45 2.9 2.9Motor torque 12.294 6.462 4.257 3.105 2.61multiplier,equation (12)RPM multiplier, 165.56 87.02 57.33 41.81 35.15equation (13)Current in amps, Motor Motor Motor Wheel Vehicle Wheel Vehicle Wheel Vehicle Wheel Vehicle Wheel Vehicletorque in ft-lbs, Current Torque RPM Torque Speed Torque Speed Torque Speed Torque Speed Torque Speedvehicle speedin mph100 10 7750 122.94 46.81 64.62 89.06 42.57 135.19 31.05 185.34 26.10 220.50125 15 6400 184.41 38.66 96.93 73.54 63.86 111.64 46.58 153.06 39.15 182.09150 20 5000 245.88 30.20 129.24 57.46 85.14 87.22 62.10 119.58 52.20 142.26170 25 4600 307.35 27.78 161.55 52.86 106.43 80.24 77.63 110.01 65.25 130.88190 30 4100 368.82 24.76 193.86 47.11 127.71 71.52 93.15 98.05 78.30 116.65210 35 3900 430.29 23.56 226.17 44.82 149.00 68.03 108.68 93.27 91.35 110.96230 40 3700 491.76 22.35 258.48 42.52 170.28 64.54 124.20 88.49 104.40 105.27250 45 3500 553.23 21.14 290.79 40.22 191.57 61.05 139.73 83.70 117.45 99.58270 50 3400 614.70 20.54 323.10 39.07 212.85 59.31 155.25 81.31 130.50 96.73290 55 3350 676.17 20.23 355.41 38.50 234.14 58.44 170.78 80.12 143.55 95.31305 60 3250 737.64 19.63 387.72 37.35 255.42 56.69 186.30 77.73 156.60 92.47320 65 3150 799.11 19.03 420.03 36.20 276.71 54.95 201.83 75.33 169.65 89.62335 70 3050 860.58 18.42 452.34 35.05 297.99 53.20 217.35 72.94 182.70 86.78355 75 3000 922.05 18.12 484.65 34.47 319.28 52.33 232.88 71.75 195.75 85.35370 80 2950 983.52 17.82 516.96 33.90 340.56 51.46 248.40 70.55 208.80 83.93390 85 2900 1045.0 17.52 549.27 33.33 361.85 50.59 263.93 69.35 221.85 82.51405 90 2850 1106.5 17.21 581.58 32.75 383.13 49.71 279.45 68.16 234.90 81.09420 95 2800 1167.9 16.91 613.89 32.18 404.42 48.84 294.98 66.96 247.95 79.66440 100 2750 1229.4 16.61 646.20 31.60 425.70 47.97 310.50 65.77 261.00 78.24*Values computed for 1987 Ford Ranger pickup; tires = P185/75R14; revolutions/mile = 808; overall drivetrain efficiency = 0.90; dc series tractionmotor is Advanced DC Motors Model FBI-4001; battery pack is 120 volts; equation (12) is T wheel= T motor/(overall gear ratio x overall drivetrainefficiency); equation (13) is Speed vehicle= RPM motorx 60)/(overall gear ratio x revolutions/mile).Ta b l e 5-11 Torque Available Worksheet for 120-V olt DC Series Motor P owered 1987 F ord Ranger Pickup at Different Motor Speeds and Gear Ratios