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).
Comparative table of wind resistance and performance data for various car models.
| Identifier | ExFiles\Box 161\1\ scan0177 | |
| Date | 15th August 1938 | |
| Wind Resistance, 1380 CAR. TOTAL WT. 2 PASS: ROAD WHEEL H.P. AT MAX. LAP SPEED. MAX. LAP SPEED. FRONTAL AREA OF CAR SQ/FEET. C FRONTAL AREA OR SPECIFIC WIND RESIST: ROAD WHEEL H.P. TO LAP @ 80 M.P.H. P.III Close Coupled | 2.7 | 127.5 | 91 | 28.8 | .00205 | 86.5 WRAITH Close Coupled | 2.05 | 65 | 74 | 27.2 | .002 | 81 B.III | 1.84 | 90 | 87.2 | 24.06 | .00195 | 69.8 PACKARD. | 1.72 | 72 | 81 | 26.4 | .00178 | 69.2 OLDSMOBILE | 1.70 | 57.5 | 77 | 25.6 | .00168 | 64.5 FORD Vee 8. | 1.51 | 58 | 81.6 | 23.80 | .00150 | 55 PAULIN | 1.70 | 90* | 97* | 24.5 | .00134 | 51 *Tentative figures. Rm{William Robotham - Chief Engineer}6/R.15.8.38. | ||