(a)(1) Road load as a function of speed is given by the following equation: F = A + CV\2\
(1) Road load as a function of speed is given by the following equation: F = A + CV\2\
(2) The values for coefficients A and C and the test inertia are given in Figure F98-9 of this section. Velocity V is in km/h and force (F) is in newtons. The forces given by the equation in paragraph (a)(1) of this section shall be simulated to the best ability of the equipment being used.
(b) The inertia given in Figure F98-9 shall be used. Motorcycles with loaded vehicle mass outside these limits shall be tested at an equivalent inertial mass and road load force specified by the Administrator. Figure F98-9 follows:
Figure F98-9--------------------------------------------------------------------------------------------------------------------------------------------------------
Force coefficients 70 to 60 km/h coastdown calibration
--------------------------- times
Equivalent --------------------------------------
Loaded vehicle mass (kg) inertial Force at 65 Allowable tolerance
mass (kg) A (nt) C (nt/(km/ km/h (nt) Target time -------------------------
h)\2\) (Sec. Longest Shortest
time (Sec. time (sec)--------------------------------------------------------------------------------------------------------------------------------------------------------95-105...................................................... 100 0.0 .0224 94.8 2.95 3.1 2.8106-115..................................................... 110 0.82 .0227 96.8 3.18 3.3 3.0116-125..................................................... 120 1.70 .0230 98.8 3.39 3.6 3.2126-135..................................................... 130 2.57 .0233 100.9 3.60 3.8 3.4136-145..................................................... 140 3.44 .0235 102.9 3.80 4.0 3.6146-155..................................................... 150 4.32 .0238 104.9 3.99 4.2 3.8156-165..................................................... 160 5.19 .0241 107.0 4.10 4.4 4.0166-175..................................................... 170 6.06 .0244 109.0 4.36 4.6 4.2176-185..................................................... 180 6.94 .0246 111.0 4.53 4.7 4.3186-195..................................................... 190 7.81 .0249 113.1 4.69 4.9 4.5196-205..................................................... 200 8.69 .0252 115.1 4.85 5.1 4.6206-215..................................................... 210 9.56 .0255 117.1 5.00 5.2 4.8216-225..................................................... 220 10.43 .0257 119.2 5.15 5.4 4.9226-235..................................................... 230 11.31 .0260 121.2 5.30 5.5 5.1236-245..................................................... 240 12.18 .0263 123.2 5.43 5.7 5.2246-255..................................................... 250 13.06 .0266 125.3 5.57 5.8 5.4256-265..................................................... 260 13.93 .0268 127.3 5.70 5.9 5.5266-275..................................................... 270 14.80 .0271 129.3 5.82 6.1 5.6276-285..................................................... 280 15.68 .0274 131.4 5.95 6.2 5.7286-295..................................................... 290 16.55 .0277 133.4 6.06 6.3 5.8296-305..................................................... 300 17.43 .0279 135.4 6.18 6.4 6.0306-315..................................................... 310 18.30 .0282 137.5 6.29 6.5 6.1316-325..................................................... 320 19.17 .0285 139.5 6.40 6.6 6.2326-335..................................................... 330 20.05 .0288 141.6 6.50 6.7 6.3336-345..................................................... 340 20.92 .0290 143.6 6.60 6.8 6.4346-355..................................................... 350 21.80 .0293 145.6 6.70 6.9 6.5356-365..................................................... 360 22.67 .0296 147.7 6.80 7.0 6.6366-375..................................................... 370 23.54 .0299 149.7 6.89 7.1 6.7
376-385..................................................... 380 24.42 .0301 151.7 6.98 7.2 6.8386-395..................................................... 390 25.29 .0304 153.8 7.07 7.3 6.9396-405..................................................... 400 26.17 .0307 155.8 7.16 7.4 6.9406-415..................................................... 410 27.04 .0310 157.8 7.24 7.5 7.0416-425..................................................... 420 27.91 .0312 159.9 7.33 7.6 7.1426-435..................................................... 430 28.79 .0315 161.9 7.41 7.6 7.2436-445..................................................... 440 29.66 .0317 163.7 7.49 7.7 7.3446-455..................................................... 450 30.54 .0318 164.9 7.61 7.8 7.4456-465..................................................... 460 31.41 .0319 166.0 7.73 8.0 7.5466-475..................................................... 470 32.28 .0319 167.1 7.84 8.1 7.6476-485..................................................... 480 33.16 .0320 168.3 7.95 8.2 7.7486-495..................................................... 490 34.03 .0320 169.4 8.06 8.3 7.8496-505..................................................... 500 34.90 .0321 170.5 8.17 8.4 7.9506-515..................................................... 510 35.78 .0322 171.7 8.28 8.5 8.0516-525..................................................... 520 36.65 .0322 172.8 8.39 8.6 8.2526-535..................................................... 530 37.53 .0323 173.9 8.49 8.7 8.3536-545..................................................... 540 38.40 .0323 175.1 8.60 8.8 8.4546-555..................................................... 550 39.27 .0324 176.2 8.70 9.0 8.5556-565..................................................... 560 40.15 .0325 177.3 8.80 9.1 8.6566-575..................................................... 570 41.02 .0325 178.5 8.90 9.2 8.7576-585..................................................... 580 41.90 .0326 179.6 9.00 9.3 8.8586-595..................................................... 590 42.77 .0327 180.8 9.10 9.4 8.9596-605..................................................... 600 43.64 .0327 181.9 9.19 9.5 8.9606-615..................................................... 610 44.52 .0328 183.0 9.29 9.5 9.0616-625..................................................... 620 45.39 .0328 184.2 9.38 9.6 9.1626-635..................................................... 630 46.27 .0329 185.3 9.47 9.7 9.2636-645..................................................... 640 47.14 .0330 186.4 9.56 9.8 9.3646-655..................................................... 650 48.01 .0330 187.6 9.65 9.9 9.4656-665..................................................... 660 48.89 .0331 188.7 9.74 10.0 9.5666-675..................................................... 670 49.76 .0332 189.8 9.83 10.1 9.6676-685..................................................... 680 50.64 .0332 191.0 9.92 10.2 9.7686-695..................................................... 690 51.51 .0333 192.1 10.01 10.3 9.8696-705..................................................... 700 52.38 .0333 193.2 10.09 10.4 9.8706-715..................................................... 710 53.26 .0334 194.4 10.17 10.4 9.9716-725..................................................... 720 54.13 .0335 195.5 10.26 10.5 10.0726-735..................................................... 730 55.01 .0335 196.6 10.34 10.6 10.1736-745..................................................... 740 55.88 .0336 197.8 10.42 10.7 10.2746-755..................................................... 750 56.75 .0336 198.9 10.50 10.8 10.2756-765..................................................... 760 57.63 .0337 200.1 10.58 10.9 10.3766-775..................................................... 770 58.50 .0338 201.2 10.66 10.9 10.3776-785..................................................... 780 59.38 .0338 203.3 10.74 11.0 10.4786-795..................................................... 790 60.25 .0339 204.5 10.82 11.1 10.5796-805..................................................... 800 61.12 .0339 205.6 10.91 11.2 10.6806-815..................................................... 810 62.00 .0340 206.7 10.99 11.3 10.7816-825..................................................... 820 62.87 .0341 207.9 11.07 11.4 10.8826-835..................................................... 830 63.75 .0341 209.0 11.15 11.5 10.8836-845..................................................... 840 64.62 .0342 210.1 11.24 11.5 10.9846-855..................................................... 850 65.49 .0343 211.3 11.32 11.6 11.0856-865..................................................... 860 66.37 .0343 212.4 11.40 11.7 11.1866-873..................................................... 870 67.24 .0344 213.5 11.48 11.8 11.2--------------------------------------------------------------------------------------------------------------------------------------------------------
(c) The dynamometer shall be adjusted to reproduce the specified road load as determined by the most recent calibration. Alternatively, the actual vehicle road load can be measured and duplicated:
(1) Make at least 5 replicate coastdowns in each direction from 70 to 60 km/h on a smooth, level track under balanced wind conditions. The driver must have a mass of 80 [10 kg and be in the normal driving position. Record the coastdown time.
(2) Average the coastdown times. Adjust the dynamometer load so that the coastdown time is duplicated with the vehicle and driver on the dynamometer.
(3) Alternate procedures may be used if approved in advance by the Administrator. [63 FR 11849, Mar. 11, 1998, as amended at 80 FR 9104, Feb. 19, 2015]