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 and typed analysis comparing specific fuel consumption against brake mean effective pressure for various engine heating systems.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan91 | |
| Date | 14th January 1926 guessed | |
| contd :- -11- Graph Text: 750. R.P.M. AIR TEMP 33 To 40°C BAROMETER 754 M.M. Y-Axis: Pts / B.H.P / Hour. X-Axis: B.M.E.P. lbs/□" Plot Lines: WATER HEATED, SUPERHEATED, STD EXH HEATED. Annotation: GAIN IN ECONOMY (MAX) By STD HOT SPOT. Annotation: MAX B.H.P. Typed Text: in the maximum B.M.E.P. with either system but that the specific consumption at the point of maximum B.M.E.P. is considerably less with the standard system than with the water heated system. About .55 pts/B.HP/hr. gives maximum torque with the standard hot spot whereas .64 pts/B.HP/hr. is the corresponding figure with the water hot spot. The superheated system falls between these two with a value of approx. .660. The specific consumption for the superheater water system is practically the same with .532 pts/HP/hr. but the min. consumption for the standard system contd :- | ||