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).
Graph showing the Mechanical Efficiency and Friction Horsepower of the Super Sports Engine No SS-3 against RPM.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan094 | |
| Date | 25th September 1928 | |
| MECHANICAL EFFICIENCY (SUPER SPORTS ENGINE). ENGINE No SS{S. Smith}-3. PERCENTAGE MECHANICAL EFFICIENCY. 100%. 90%. 80%. 70%. Mech. Efficy. Friction H.P. R.P.M. OF ENGINE. 1000. 1500. 2000. 2500. HORSE POWER. 30. 20. 10. 0. | ||