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).
The average lap speeds of three different Bentley models tested at Brooklands track.
| Identifier | ExFiles\Box 3\4\ 04-page305 | |
| Date | 3rd June 1933 | |
| X41926 To Sg.{Arthur F. Sidgreaves - MD} from Ha/Ra. c. to Mor. c. to Z. c. to Sy. Ha/Ra.4/KT.3.6.33. c. to Da.{Bernard Day - Chassis Design} c. to Hdy.{William Hardy} BENTLEY. BROOKLANDS TESTS. We have now the average of three Bentley cars on Brooklands track. BENTLEY No.1. 4 DOOR SALOON. NORMAL WINGS. 6.6 C/R.{Sir Henry Royce} 11-43 Axle. 88 M.P.H. at 4000 R.P.M. Condition Lap Speed. C.O. Closed. 87 M.P.H. C.O. Open 88.5 M.P.H. (Silver Ghost Type.) BENTLEY No.2. 4 DOOR SALOON. FLARED WINGS. 6.35 C/R.{Sir Henry Royce} 10-41 Axle. 83 M.P.H. at 4000 R.P.M. Condition. Lap Speed. C.O. Closed. 85.13 M.P.H. BENTLEY No.3. CLOSE COUPLED 2 DOOR. FLARED WINGS. 6.6 C/R.{Sir Henry Royce} 10-41 Axle. 83 M.P.H. at 4000 R.P.M. Condition Lap Speed. C.O. Closed. 85.87 M.P.H. C.O. Open 86.12 M.P.H. (New Type). It is clear from these figures that we are between 1 & 2 M.P.H. slower with the lower axle ratio, which, however, gives better acceleration. We have tested the air cleaner and breather that is being fitted to the first fifteen cars and do not lose any maximum speed with it. | ||