From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance calculations for two vehicle tests, including horsepower, tractive resistance, and windage.
| Identifier | ExFiles\Box 90a\2\ Scan190 | |
| Date | 22th June 1934 | |
| Appendix, (2) EV.{Ivan Evernden - coachwork}1/KW.22.6.34. R-35-AE. Test 2. Road Wheel H.P. = 92.5 at 4150 R.P.M. & 86 M.P.H. Axle ratio 4.1 to 1; Projected Area 15.000 sq. ft. Const. T.R. at 30 lbs/ton = 42 lbs. H.P. at 90 M.P.H. due to Const. T.R. = (42 x 90) / 375 = 10.00 H.P. T.R. due to windage = (92.5 x 375) / 90 = 344 lbs. T.R. at 100 M.P.H. = (344 x 100²) / 90² = 425 lbs. K = 344 / (15.0 x 90²) = .00283 R-23-AE. Streamline Saloon (Test 6). Road Wheel H.P. = 92.5 at 4150 R.P.M. & 94.5 M.P.H. Axle ratio = 3.73 to 1; Projected Area 19.025 sq.ft. Const. T.R. at 30 lbs. per ton; wgt. 2 up = 1.6 tons. H.P. due to const. T.R. at 95 M.P.H. = (30 x 1.6 x 95) / 375 = 12.15 H.P. T.R. due to windage = (80.35 x 375) / 95 = 318 lbs. Windage at 100 M.P.H. = (318 x 100²) / 95² = 352 lbs. K = 318 / (19.025 x 95²) = .001845. | ||