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 tractive resistance figures for a 1935 Standard Bentley Park Ward Saloon.
| Identifier | ExFiles\Box 84\3\ scan0117 | |
| Date | 6th March 1939 | |
| 204t 1380 To Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}.. from Ev.{Ivan Evernden - coachwork} c. Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/Swinden, c. By.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}9/N.6.3.39. Re: Standard Bentley, 1935. Std. Park Ward Saloon 181.CW. We have analysed the figures relating to the tractive resistance of the above car as produced by measured retardation. The approximation - Tr{Capt. F. W. Turner - Finance} = (46 + .0413V^2) lbs. is not too bad up to 75 M.P.H. but goes very wrong if extended to 95 M.P.H. From the appendix it will be seen that assuming 34 lbs ins^2 as tyre pressure and Andreau's figures for the resistance, one gets figures for the windage drag up to 75 M.P.H. which give an almost constant K.{Mr Kilner} of .00163. This agrees very closely with our old tests on the I.B.4. saloon, which if Andreau's tyre drag be applied give a K.{Mr Kilner} of .00175. Ev.{Ivan Evernden - coachwork} | ||