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 plotting the Mechanical Efficiency and Friction Horsepower of a Super Sports Engine against its RPM.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan193 | |
| Date | 25th September 1928 | |
| MECHANICAL EFFICIENCY (SUPER SPORTS ENGINE) ENGINE N° SS{S. Smith}-3 PERCENTAGE MECHANICAL EFFICIENCY 100% 90% 80% 70% R.P.M. OF ENGINE. 1000 1500 2000 2500 MECH. EFFICy FRICTION H.P. HORSE POWER. 30 20 10 0 25-9-28 V432 | ||