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§ 86.529-98 Road load force and inertia weight determination.
(a)
(1) Road load as a function of speed is given by the following equation:
(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
| Loaded vehicle mass (kg) | Equivalent inertial mass (kg) | Force coefficients | Force at 65 km/h (nt) | 70 to 60 km/h coastdown calibration times | |||
|---|---|---|---|---|---|---|---|
| A (nt) | C (nt/(km/h) 2) | Target time (sec) | Allowable tolerance | ||||
| Longest time (sec) | Shortest time (sec) | ||||||
| 95–105 | 100 | 0.0 | .0224 | 94.8 | 2.95 | 3.1 | 2.8 |
| 106–115 | 110 | 0.82 | .0227 | 96.8 | 3.18 | 3.3 | 3.0 |
| 116–125 | 120 | 1.70 | .0230 | 98.8 | 3.39 | 3.6 | 3.2 |
| 126–135 | 130 | 2.57 | .0233 | 100.9 | 3.60 | 3.8 | 3.4 |
| 136–145 | 140 | 3.44 | .0235 | 102.9 | 3.80 | 4.0 | 3.6 |
| 146–155 | 150 | 4.32 | .0238 | 104.9 | 3.99 | 4.2 | 3.8 |
| 156–165 | 160 | 5.19 | .0241 | 107.0 | 4.10 | 4.4 | 4.0 |
| 166–175 | 170 | 6.06 | .0244 | 109.0 | 4.36 | 4.6 | 4.2 |
| 176–185 | 180 | 6.94 | .0246 | 111.0 | 4.53 | 4.7 | 4.3 |
| 186–195 | 190 | 7.81 | .0249 | 113.1 | 4.69 | 4.9 | 4.5 |
| 196–205 | 200 | 8.69 | .0252 | 115.1 | 4.85 | 5.1 | 4.6 |
| 206–215 | 210 | 9.56 | .0255 | 117.1 | 5.00 | 5.2 | 4.8 |
| 216–225 | 220 | 10.43 | .0257 | 119.2 | 5.15 | 5.4 | 4.9 |
| 226–235 | 230 | 11.31 | .0260 | 121.2 | 5.30 | 5.5 | 5.1 |
| 236–245 | 240 | 12.18 | .0263 | 123.2 | 5.43 | 5.7 | 5.2 |
| 246–255 | 250 | 13.06 | .0266 | 125.3 | 5.57 | 5.8 | 5.4 |
| 256–265 | 260 | 13.93 | .0268 | 127.3 | 5.70 | 5.9 | 5.5 |
| 266–275 | 270 | 14.80 | .0271 | 129.3 | 5.82 | 6.1 | 5.6 |
| 276–285 | 280 | 15.68 | .0274 | 131.4 | 5.95 | 6.2 | 5.7 |
| 286–295 | 290 | 16.55 | .0277 | 133.4 | 6.06 | 6.3 | 5.8 |
| 296–305 | 300 | 17.43 | .0279 | 135.4 | 6.18 | 6.4 | 6.0 |
| 306–315 | 310 | 18.30 | .0282 | 137.5 | 6.29 | 6.5 | 6.1 |
| 316–325 | 320 | 19.17 | .0285 | 139.5 | 6.40 | 6.6 | 6.2 |
| 326–335 | 330 | 20.05 | .0288 | 141.6 | 6.50 | 6.7 | 6.3 |
| 336–345 | 340 | 20.92 | .0290 | 143.6 | 6.60 | 6.8 | 6.4 |
| 346–355 | 350 | 21.80 | .0293 | 145.6 | 6.70 | 6.9 | 6.5 |
| 356–365 | 360 | 22.67 | .0296 | 147.7 | 6.80 | 7.0 | 6.6 |
| 366–375 | 370 | 23.54 | .0299 | 149.7 | 6.89 | 7.1 | 6.7 |
| 376–385 | 380 | 24.42 | .0301 | 151.7 | 6.98 | 7.2 | 6.8 |
| 386–395 | 390 | 25.29 | .0304 | 153.8 | 7.07 | 7.3 | 6.9 |
| 396–405 | 400 | 26.17 | .0307 | 155.8 | 7.16 | 7.4 | 6.9 |
| 406–415 | 410 | 27.04 | .0310 | 157.8 | 7.24 | 7.5 | 7.0 |
| 416–425 | 420 | 27.91 | .0312 | 159.9 | 7.33 | 7.6 | 7.1 |
| 426–435 | 430 | 28.79 | .0315 | 161.9 | 7.41 | 7.6 | 7.2 |
| 436–445 | 440 | 29.66 | .0317 | 163.7 | 7.49 | 7.7 | 7.3 |
| 446–455 | 450 | 30.54 | .0318 | 164.9 | 7.61 | 7.8 | 7.4 |
| 456–465 | 460 | 31.41 | .0319 | 166.0 | 7.73 | 8.0 | 7.5 |
| 466–475 | 470 | 32.28 | .0319 | 167.1 | 7.84 | 8.1 | 7.6 |
| 476–485 | 480 | 33.16 | .0320 | 168.3 | 7.95 | 8.2 | 7.7 |
| 486–495 | 490 | 34.03 | .0320 | 169.4 | 8.06 | 8.3 | 7.8 |
| 496–505 | 500 | 34.90 | .0321 | 170.5 | 8.17 | 8.4 | 7.9 |
| 506–515 | 510 | 35.78 | .0322 | 171.7 | 8.28 | 8.5 | 8.0 |
| 516–525 | 520 | 36.65 | .0322 | 172.8 | 8.39 | 8.6 | 8.2 |
| 526–535 | 530 | 37.53 | .0323 | 173.9 | 8.49 | 8.7 | 8.3 |
| 536–545 | 540 | 38.40 | .0323 | 175.1 | 8.60 | 8.8 | 8.4 |
| 546–555 | 550 | 39.27 | .0324 | 176.2 | 8.70 | 9.0 | 8.5 |
| 556–565 | 560 | 40.15 | .0325 | 177.3 | 8.80 | 9.1 | 8.6 |
| 566–575 | 570 | 41.02 | .0325 | 178.5 | 8.90 | 9.2 | 8.7 |
| 576–585 | 580 | 41.90 | .0326 | 179.6 | 9.00 | 9.3 | 8.8 |
| 586–595 | 590 | 42.77 | .0327 | 180.8 | 9.10 | 9.4 | 8.9 |
| 596–605 | 600 | 43.64 | .0327 | 181.9 | 9.19 | 9.5 | 8.9 |
| 606–615 | 610 | 44.52 | .0328 | 183.0 | 9.29 | 9.5 | 9.0 |
| 616–625 | 620 | 45.39 | .0328 | 184.2 | 9.38 | 9.6 | 9.1 |
| 626–635 | 630 | 46.27 | .0329 | 185.3 | 9.47 | 9.7 | 9.2 |
| 636–645 | 640 | 47.14 | .0330 | 186.4 | 9.56 | 9.8 | 9.3 |
| 646–655 | 650 | 48.01 | .0330 | 187.6 | 9.65 | 9.9 | 9.4 |
| 656–665 | 660 | 48.89 | .0331 | 188.7 | 9.74 | 10.0 | 9.5 |
| 666–675 | 670 | 49.76 | .0332 | 189.8 | 9.83 | 10.1 | 9.6 |
| 676–685 | 680 | 50.64 | .0332 | 191.0 | 9.92 | 10.2 | 9.7 |
| 686–695 | 690 | 51.51 | .0333 | 192.1 | 10.01 | 10.3 | 9.8 |
| 696–705 | 700 | 52.38 | .0333 | 193.2 | 10.09 | 10.4 | 9.8 |
| 706–715 | 710 | 53.26 | .0334 | 194.4 | 10.17 | 10.4 | 9.9 |
| 716–725 | 720 | 54.13 | .0335 | 195.5 | 10.26 | 10.5 | 10.0 |
| 726–735 | 730 | 55.01 | .0335 | 196.6 | 10.34 | 10.6 | 10.1 |
| 736–745 | 740 | 55.88 | .0336 | 197.8 | 10.42 | 10.7 | 10.2 |
| 746–755 | 750 | 56.75 | .0336 | 198.9 | 10.50 | 10.8 | 10.2 |
| 756–765 | 760 | 57.63 | .0337 | 200.1 | 10.58 | 10.9 | 10.3 |
| 766–775 | 770 | 58.50 | .0338 | 201.2 | 10.66 | 10.9 | 10.3 |
| 776–785 | 780 | 59.38 | .0338 | 203.3 | 10.74 | 11.0 | 10.4 |
| 786–795 | 790 | 60.25 | .0339 | 204.5 | 10.82 | 11.1 | 10.5 |
| 796–805 | 800 | 61.12 | .0339 | 205.6 | 10.91 | 11.2 | 10.6 |
| 806–815 | 810 | 62.00 | .0340 | 206.7 | 10.99 | 11.3 | 10.7 |
| 816–825 | 820 | 62.87 | .0341 | 207.9 | 11.07 | 11.4 | 10.8 |
| 826–835 | 830 | 63.75 | .0341 | 209.0 | 11.15 | 11.5 | 10.8 |
| 836–845 | 840 | 64.62 | .0342 | 210.1 | 11.24 | 11.5 | 10.9 |
| 846–855 | 850 | 65.49 | .0343 | 211.3 | 11.32 | 11.6 | 11.0 |
| 856–865 | 860 | 66.37 | .0343 | 212.4 | 11.40 | 11.7 | 11.1 |
| 866–873 | 870 | 67.24 | .0344 | 213.5 | 11.48 | 11.8 | 11.2 |