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).
Battery, ignition plug, and instrument performance, with acceleration test results for different tyres.
| Identifier | ExFiles\Box 82\2\ scan0139 | |
| Date | 1st August 1934 guessed | |
| - 8 - BATTERY. We have had no failure of supply from the battery. Water evaporation has been rather more than usual; .77 of a pint has been added during the latter mileage. The anchorage of the battery box has given no trouble. IGNITION PLUGS KLG.7652. WITH PHILCO SUPRESSORS FITTED. The plug points do not show any excessive burning, the gap having only increased by .002". The copper disc and the top of the insulation of the center electrode has become pitted and burnt, but with these conditions we have not had any failure of the plugs. INSTRUMENTS LIGHTENED TYPE TO RR.sch.552. The speedometer trip righted itself and has been operating satisfactorily for the latter part of the mileage. The revolution counter is still sluggish between zero and 600 revolutions. ACCELERATION TESTS. AXLE RATIO 11.41 DUNLOP "SILENT" TYRES 6x18. M.{Mr Moon / Mr Moore} P. H.{Arthur M. Hanbury - Head Complaints} SECONDS. 10 to 20 4.0 20 " 30 4.1 30 " 40 4.3 40 " 50 4.5 50 " 60 5.6 60 " 70 7.7 70 " 80 10.4 Standing start through gears to 80.... 42.7 ACCELERATION TESTS. AXLE RATIO 11.41 INDIA "SILENT" TYRES 5.50x18. 10 to 20 4.- 20 " 30 3.4 30 " 40 3.4 40 " 50 4.5 50 " 60 4.4 60 " 70 6.5 70 " 80 11.- [Handwritten note: 19.7] Standing start through gears to 80 MPH...31.2 | ||