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).
Speed tests for Chassis 2.B.IV on the Brooklands track with various engine and body configurations.
| Identifier | ExFiles\Box 155\1\ scan0083 | |
| Date | 17th May 1933 | |
| FILES ONLY. X488 To Sg.{Arthur F. Sidgreaves - MD} from Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} c. to Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}1/KT.17.5.33. CHASSIS 2.B.IV. ON BROOKLANDS TRACK. We have taken the second Bentley car to Brooklands to test out the effect on maximum speed of the twin hot spot feed and the single centre feed from the cylinder head to the hot spot. In addition a value was obtained for the 40/50 air intake silencer which was fitted to this car temporarily and also for the front wings which are the flared type. The following are the results obtained. (A). Lap Speeds. (1) Twin Hot Spot Feed - Air Silencer On - 83.07 m.p.h. (2) " " " " - Air Silencer Off - 84.12 m.p.h. (3) Single Hot Spot Feed - Air Silencer Off - 85.13 m.p.h. (4) Single Hot Spot Feed - Air Silencer Off, No Front Wings - 89.09 m.p.h. (B). Flying Half Mile Speeds. (1) Twin Hot Spot Feed - Air Silencer On - 83.91 m.p.h. (2) " " " " - Air Silencer Off - 84.3 m.p.h. (3) Single Hot Spot Feed - Air Silencer Off - 85.71 m.p.h. (4) Single Hot Spot Feed - Air Silencer Off, No Front Wings - 90.91 m.p.h. N.B. All the above figures are the average of three readings in each case. If we take the lap speed times as a truer basis of comparison than the half mile times we find that (1) The air silencer reduces the lap speed by 1.05 m.p.h. (2) The single hot spot feed is better than the double feed to the extent of 1.01 m.p.h. (3) The front wings reduce the maximum speed by 3.64 m.p.h. | ||