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 test results table for acceleration, flying start, and lap speeds under various car configurations.
| Identifier | ExFiles\Box 49\1\ Scan183 | |
| Date | 19th July 1927 | |
| C.P.L. 6.28 Acceleration. Test No., Condition of Car., Compression., 10 to 60 MPH. top gear axle ratio 15 x 52, 10 to 60 MPH. top gear axle ratio 16 x 52, ¼ mile flying start. axle ratio 15 x 52, ¼ mile flying start. axle ratio 16 x 52, Lap speed. Axle ratio 15 x 52, Lap speed. Axle ratio 16 x 52 1., Hood down, screen down, cutout open., High, 20 secs., 26 secs., 78.26 MPH., 78.26 MPH., 73.24 MPH., 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, 1/8" liners under cylinder., 23", 28", 74.07", 75.0", 72.18", 72.18" 4., Same as No.1 cutout closed. Y, ", 25", 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., 1/8" 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., 1/8" 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., 1/8" liners under cylinder., 25", 32", 69.23", 69.23", 66.85", 65.10" R.R. 199 (SDT) (SD6) 19-7-27 / M.P.18985 | ||