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 performance curves for a Hispano car, showing heat flow, horsepower, and fuel consumption against engine RPM.
| Identifier | ExFiles\Box 22\1\ Scan204 | |
| Date | 1st October 1924 | |
| CURVE No. I. HEAT FLOW TO JACKET WATER. HISPANO CAR. THE FIGURES FOR HT FLOW ARE THE MAXIMUM WE HAVE RECORDED FOR THIS ENGINE AND ARE TAKEN FOR THE WEAKEST MIXTURE THAT WILL JUST MAINTAIN MAX. TORQUE. PERCENTAGE HT FLOW B.T.U.S PER MIN ENGINE R.P.M. PET. CON IN PTS/HOUR & H.P. AT ROAD WHEELS. HT. TO JACKET WATER AS %AGE OF FUEL ENERGY HORSE POWER AT ROAD WHEELS PET. CONSUMPTION PTS/HOUR HT. FLOW TO JACKET WATER | ||