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 comparing acceleration and speed with different car configurations and axle ratios.
| Identifier | Morton\M22\ img042 | |
| Date | 19th July 1917 | |
| Test Condition of Car, No., Compression, Acceleration 10 to 60 MPH top gear, axle ratio 15 X 52, axle ratio 16 X 52, 1/4 mile flying start, axle ratio 15 X 52, axle ratio 16 X 52, Lap Speed, 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", 71.47", 69.66", 69.66" 3. Same as No. 1 cutout open, "liners under cylinder", 23, 28, 74.07", 75.0", 71.15", 68.22" 4. cutout closed, , 25, 32, 69.23", 70.59", 68.22", 68.22" 5. Windscreen up, hood down, cutout open., High, 26, -, 75.0", 72.0", 72.18", 71.15" 6. Same as No. 5, "liners under cylinder", 28, 28, 71.0", 72.0", 70.64", 70.14" 7. Windscreen up and hood up, cutout open., High, 21, 28, 75.0", 73.47", 71.68", 70.14" 8. Same as No. 7., "liners under cylinder", 23, 30, 71.0", 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", 66.85", 61.11" Handwritten: 49 G B Footer: R.R. 199 (1250T) (SD676 19-7-17) MP180865 | ||