Power curve graph for Engine No. SS 15, showing brake horse power vs RPM for an exhaust heated hot-spot system.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan104 | |
| Date | 22th October 1929 | |
| POWER CURVE (EXHAUST HEATED HOT-SPOT) ENGINE No. SS {S. Smith} 15 STANDARD INDUCTION SYSTEM EXCEPT FOR HOT-SPOT CAR TYPE SILENCER HOT-SPOT EXHAUSTS INTO ATMOSPHERE BRAKE HORSE POWER STD. WATER HEATED HOT-SPOT HOT SPOT TEMP* *THESE TEMPERATURES REACH A HIGHER VALUE THAN OBTAINABLE ON THE ROAD, DUE TO LACK OF COOLING BY FAN AND ALSO DUE TO A GREATER CIRCULATION THRO' HOT-SPOT OCCASIONED BY EXHAUSTING DIRECTLY INTO ATMOSPHERE INSTEAD OF FISHTAIL PIPE R.P.M. OF ENGINE HOT-SPOT TEMPERATURE (CENTIGRADE) RM {William Robotham - Chief Engineer} 22.10-29 | ||
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).