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).
Lap speed and time test results from Brooklands with different equipment setups.
| Identifier | ExFiles\Box 155\1\ scan0090 | |
| Date | 1st June 1933 | |
| Files. x788 Hd.{Mr Hayward/Mr Huddy} 1.6.33. 3.B.IV. - BROOKLANDS. R.R.Petrol Pump. Air Silencer fitted. Axle ratio 10 x 41. 83. M.P.H. at 4000 R.P.M. Lap Speeds & Times. Cut out closed 1 - 57.6 secs. 84.70 M.P.H. 1 - 56 secs. 85.87 M.P.H. Cut out Open. 1 - 56.2 secs 85.72 M.P.H. 1 - 56 secs 85.87 M.P.H. 1 - 55 secs 86.62 M.P.H. --- As above with no air silencer fitted:- Cut out closed - Not taken. Cut out open 1 - 56.4 secs. 85.57 M.P.H. 1 - 55.2 secs. 86.46 M.P.H. 1 - 55.4 secs. 86.32 M.P.H. --- S.U. Petrol pumps fitted No air silencer :- Cut out closed 1 - 55.2 secs. 86.43 M.P.H. Cut out open. 1 - 56.6 secs. 85.43 M.P.H. 1 - 56 85.87 M.P.H. 1 - 54.8 86.77 M.P.H. --- Air temp 21.5°C.. Water temp. 80°C. Harrison narrow type rad. fitted. Speedometer reads 2 m.p.h. slow at 70 m.p.h. 4000 R.P.M. on Rev. counter = 86.5 M.P.H. on speedo. G.H. Whyman. | ||