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).
Explaining an attached chart of car engine R.P.M. figures at 60 Miles per Hour.
| Identifier | ExFiles\Box 128\3\ scan0123 | |
| Date | 22th October 1943 | |
| To wjm/CL. from Ev{Ivan Evernden - coachwork}/JD.{J. Draper - Frames} c. to Rm.{William Robotham - Chief Engineer} [Strikethrough] c. to Rm.{William Robotham - Chief Engineer} [Strikethrough] c. to Ev.{Ivan Evernden - coachwork} [Strikethrough] Chassis [Handwritten] EV{Ivan Evernden - coachwork}/JD.{J. Draper - Frames}7/JH.22.10.43. Car Engine R.P.M.'s. at 60 Miles per Hour. On the attached chart we give the engine R.P.M. figures at 60 M.P.H. of the cars you requested us to do a short time back. Column 4 on the chart shews the measured rolling circle supplied by yourself. Column 5, shews the same static rolling radius taken from standard tyre charts. (r) Column 6 shews the rolling radius at 30 M.P.H. taken from standard tyre charts. Column 7 shews the estimated rolling circle at 60 M.P.H. We suggest that Column 10 is the most accurate figure to take. This information supplements the information issued under cover of memo. EV{Ivan Evernden - coachwork}/JD.{J. Draper - Frames}2/GAB.27.9.43. Ev{Ivan Evernden - coachwork}/JD.{J. Draper - Frames} [Signature] | ||