Test report detailing performance metrics and track conditions after changing tyres.
| Identifier | ExFiles\Box 160\3\ scan0114 | |
| Date | 26th January 1939 guessed | |
| ( 2 ) Changed to 5.50 x 18" Dunlop Racing tyres at 45 lbs/sq" Standard conditions 172.437 K.P.H. 107.19 M.P.H. Overdrive { Max. 3700 r.p.m. { Min. 3600 r.p.m. Oil pressure 28 lbs/sq" Oil temperature 115°c Oil temperature rose to 125°c after 3 more laps at the same speed 172.437 K.P.H. 107.19 M.P.H. This temperature is too high to attempt one hour non stop run. The ignition timing will be re-set to T.D.C. TRACK CONDITIONS. Air temperature 4°c Wind 9 metres per second Barometer....... 730.9 Humidity figure of 100 All speeds are actual without correction. ---------- Rm {William Robotham - Chief Engineer} /GR. {George Ratcliffe} [Signature] | ||
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).