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 of Mechanical Efficiency and Friction Horsepower versus RPM for Engine No SS-3.
| Identifier | ExFiles\Box 65a\2\ scan0065 | |
| Date | 25th September 1928 | |
| MECHANICAL EFFICIENCY (SUPER SPORTS ENGINE) ENGINE No SS{S. Smith}-3 PERCENTAGE MECHANICAL EFFICIENCY 100% 90% 80% 70% MECH. EFFIC'Y FRICTION H.P. R.P.M. OF ENGINE 1000 1500 2000 2500 HORSE POWER 30 20 10 0 25-9-28 V432 RR (logo) | ||