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).
Comparison table of performance metrics for various car models, including Rolls-Royce and competitors.
| Identifier | ExFiles\Box 97\1\ scan0220 | |
| Date | 15th August 1938 | |
| HDO CAR. | TOTAL WT. 2 PASS: | ROAD WHEEL HP. AT MAX. LAP SPEED. | MAX. LAP SPEED. | WEIGHT ON FRONT WHEELS TONS. | FRONTAL AREA OF CAR SQ. FT. | WINDAGE TRACTIVE RE M.P.H. OF C FACTOR C | C FRONTAL AREA OR SPECIFIC WIND RESISTANCE. | ROAD WHEEL H.P. TO LAP @ 80 M.P.H. P.III CLOSE-COUPLED. | 2.7 | 127.5 | 91 | 1.2 | 28.8 | .059 | .00205 | 86.5 WRAITH CLOSE COUPLED | 2.05 | 65 | 74 | .95 | 27.2 | .055 | .002 | 81 B.III ✓ | 1.84 | 90 | 87.2 | .9 | 24.06 | .047 | .00195 | 69.8 PACKARD | 1.72 | 72 | 81 | .8 | 26.4 | .047 | .00178 | 69.2 OLDSMOBILE | 1.70 | 57.5 | 77 | .8 | 25.6 | .043 | .00168 | 64.5 FORD V.8 | 1.51 | 58 | 81.6 | .75 | 23.80 | .036 | .00150 | 55 PAULIN | 1.70 | 96 * | 97 * | .8 | 24.5 | .033 | .00134 | 51 *Tentative figures. WWash / R.15.8.38. | ||