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).
Analysis of the projected performance of a proposed streamlined Bentley car.
| Identifier | ExFiles\Box 90\1\ Scan197 | |
| Date | 29th October 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Ev.{Ivan Evernden - coachwork} C. to Bl. Sr. 263 DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork}20/G.29.10.37. STREAMLINE BENTLEY. As requested we have analysed the projected performance of the proposed Bentley Streamlined car, basing our assumptions that the maximum speed of 200 kilos a l'heure (125 M.P.H.) was derived by the Reflexion Method of Wind Tunnel testing, and that it was assumed that of the 140 H.P. at the clutch, 93.5% was available at the road wheels, i.e. 131 H.P. It will be seen from the appendix that when the theoretical or wind tunnel value of K is corrected by proportional analysis between a theoretical and an actual K, for the standard Saloon, results would lead us to believe in a maximum speed of approx. 116.5 M.P.H. (186.5 kilos a l'heure). Since, however, our road tests on the standard Bentley shewed us only 78.4% of the clutch horse power at the road wheels, we suggest that with 140 clutch horse power we may expect only 110 road wheel horse power and a maximum speed of 109.5 M.P.H. (or 175.5 kilos a l'heure). DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} | ||