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).
Brooklands test results showing mean lap speeds with various car alterations.
| Identifier | ExFiles\Box 29\3\ Scan177 | |
| Date | 8th September 1927 | |
| contd :- -4- (1) Cycle type front guards = 2 m.p.h. (2) Clutch HP. increased by 30.4/5 m.p.h. From various records such as that of Renault, a streamline saloon would perhaps give slightly more speed due to reduction in eddies behind the wind screen. Apart from this, we are now up against the question of frontal area which of course has steadily been increasing. BROOKLANDS TESTS 8.9.27. Standard condition : Comp. ratio 4.95 to 1, turbulent head, alum, engine, sports tail, undershield, special wings, cutout open, RR. carb., double valve springs, valve open 110 lbs. - closed 77 lbs. | Car condition. | Mean lap | | Alteration from standard. | speed. MPH. | |-----------------------------|---------------| | Standard. | 87.9 | | 16-tooth axle. | 86.5 + | | Balloon tyres. | 87.9 | | Plain bonnet. | 86.9 | | Hood up. | 84.8 | | Cutout closed. | 84.6 | | Tail removed. | 85.4 | | Undershield removed. | 87.4 | | Front wings removed. | 91.2 | | 10-EX old body and wings. | 80.5 | | Normal touring car. | 76.51 | + See memo. remarks. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||