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).
Performance data table for four production carburetters at various RPMs.
| Identifier | ExFiles\Box 7\4\ X 608 Carburetter-page32 | |
| Date | 9th June 1938 guessed | |
| 060 MAIN 030 BYEPASS. 060 MAIN 036 BYEPASS. R.P.M. LOAD PTS/HR. AIR°C. LOAD PTS/HR AIR°C. 4000 43.3 48.5 36 43.3 49.3 33 3000 62 46 35 62.4 48 35 2000 74 36 36 74.5 36.5 35. 1000 80.6 20 37 79.7 20.2 38. 500 71.6 11.5 36 68.1 10.9 37 No. 5440T. No. 5431T 4000 43.3 49 32 43.3 50.2 35 2000 72 35.8 35 72.5 36 37 1000 75.8 20 37 76.2 20 39 No. 5437T 4000 43.3 48.4 35 43.6 50 34. 2000 71.5 35.3 36 72.5 36 36 1000 79 20 40 79.5 20.5 38 No. 5436T 4000 43.7 48.5 35 44.5 49.6 35 2000 72.3 35.5 36 73.6 36.5 36 1000 78.7 20.5 38 79.5 21 38. Four carburetters out of the first batch for production. | ||