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).
Performance data for vehicle 12-GIV at Brooklands, comparing S.U. and Standard carburettors.
Identifier | ExFiles\Box 29\3\ Scan341 | |
Date | 13th August 1931 | |
To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from F.Dodd. Y788. 13.8.31 X.788. X.1487. X.7080. 12-GIV AT BROOKLANDS. S.U. Carburetter - louvred bonnet (cut out closed). | Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap mile Time | 1/2 Lap mile Speed MPH. | |---|---|---|---|---|---| | 21° | 75° | 2-12 | 75.12 | 24 secs. | 73.17 | | 21° | 75° | 2-12 | 75.23 | 24 " | 75 | S.U. Carburetter - louvred bonnet (cut out open). | Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap Mile Time | 1/2 Lap mile Speed MPH. | |---|---|---|---|---|---| | 20.5° | 70° | 2-10 | 76.27 | 23.4 | 76.92 | | 20.5° | 73° | 2-10 | 76.62 | 23.4 | 76.92 | Standard Carburetter - louvred bonnet (cut out closed). | Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap Mile Time | 1/2 Lap mile Speed MPH. | |---|---|---|---|---|---| | 19.5° | 73° | 2-18 | 71.97 | 24 secs. | 75 | | 19.5° | 72° | 2-17 | 72.49 | 23 " | 75 | | 19.5° | 72° | 2.17 | 72.49 | | | Standard Carburetter - louvred bonnet (cut out open). | Air Temp. | Water Temp. | Lap Time | Lap Speed MPH. | 1/2 Lap Mile Time | 1/2 Lap mile Speed MPH. | |---|---|---|---|---|---| | 19.5° | 73° | 2-15 | 73.35 | 23 secs. | 77.25 | | 19.5° | 73° | 2-15 | 73.45 | 23 " | 77.25 | | ||