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).
Test data sheet recording car performance, including acceleration, flying start, and lap speeds under various conditions.
| Identifier | ExFiles\Box 183\M22\ img042 | |
| Date | 19th July 1917 | |
| 49 G.B Test No. | Condition of car | Compression | Acceleration 10 to 60 MPH top gear | 1/4 mile Flying start. | Lap speed. ---|---|---|---|---|--- | | | axle ratio. 15 x 52 | axle ratio. 16 x 52 | axle ratio. 15 x 52 | axle ratio. 16 x 52 | axle ratio. 15 x 52 | axle ratio. 16 x 52 1. | Hood down, screen down, cutout open. | High | 20 secs. | 26 secs. | 78.26 MPH. | 78.26 MPH. | 73.24MPH. | 73.24 MPH. 2. | Same as no.1 cutout closed. | High | 23 " | 29 " | 70.59 " | 73.47 " | 69.66 " | 68.69 " 3. | Same as no.1 cutout open. | "liners under cylinder | 23 " | 28 " | 74.07 " | 75.0 " | 72.16 " | 71.15 " 4. | Same as no.1 cutout closed. | "liners under cylinder | 23 " | 32 " | 69.23 " | 70.59 " | 68.22 " | 68.22 " 5. | Windscreen up, hood down, cutout open. | High | -- | 26 " | 75.0 " | 75.0 " | 72.18 " | 71.15 " 6. | Same as No.5. | "liners under cylinder | -- | 28 " | 75.0 " | 72.0 " | 70.64 " | 70.14 " 7. | Windscreen and hood up, cutout open. | High | 21 " | 28 " | 75.0 " | 73.47 " | 71.66 " | 70.14 " 8. | Same as No. 7. | "liners under cylinder | 23 " | 30 " | 72.0 " | 72.0 " | 70.64 " | 69.66 " 9. | Same as No. 7 cutout closed. | High | 24 " | 30 " | 69.23 " | 72.0 " | 69.30 " | 66.39 " 10. | Same as No. 7 cutout closed. | "liners under cylinder | 25 " | 32 " | 69.23 " | 69.23 " | 66.65 " | 65.10 " Footer: R.R. 199 (2501) (SD076) 19-7-17) MP18065 | ||