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).
Data table showing calculations for Test No. 2.
| Identifier | ExFiles\Box 75\3\ scan0217 | |
| Date | 31th December 1924 | |
| Test No. 2 | Contd. (Go) (CALCULATIONS) Extra on load. Volts. Amperes. | Armature resistance (Ohms). | Ohmic Volts limit. | Back E.M.F. | Power delivered. Watts. (H.P.) | % Slip. | Engine speed. 2.05 | 2.70 | .760 | 1.44 | 60.45 | 163.3 | .219 1.33 | 3.62 | .367 | .72 | 86.75 | 314.0 | .421 3.07 | 4.99 | .615 | 1.21 | 109.79 | 548.0 | .735 3.07 | 7.35 | .418 | .86 | 136.22 | 1,000 | 1.34 3.69 | 8.95 | .412 | .865 | 161.58 | 1,445 | 1.94 | ||