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).
Test results for recession valve deceleration with governor speed reduction.
| Identifier | ExFiles\Box 151\2\ scan0063 | |
| Date | 11th April 1933 guessed | |
| RECESSION VALVE DECELERATION TESTS. (1) GOVERNOR SPEED REDUCED FROM 80 to 30 M.P.H. Table 1: Headers: Damper Speed R.P.M. | Time Secs. 80 to 30 M.P.H. Column Group 1: Without Recession Valve. Sub-columns: Governor. | Damper. | Time lag Gov. to Damper. Column Group 2: Ball Valve .015" Dia.Release Vent Sub-columns: Governor. | Damper. | Time lag Gov. to Damper. Data: 90 | 3 | 11 | 8 | 3 | 10 | 7 180 | 3 | 15 | 12 | 3 | 15 | 12 360 | 3 | 15 | 12 | 3 | 15 | 12 (2) GOVERNOR SPEED REDUCED FROM 80 M.P.H. to NIL. Table 2: Headers: Damper Speed R.P.M. | Time Secs. Column Group 1: Without Recession Valve. Sub-columns: Gov. 80 MPH. to Nil. | Damper 80 to 30 MPH. | Time Lag Gov. to Damper. Column Group 2: Ball Valve .015" Dia.Release Vent Sub-columns: Gov. 80 MPH. to Nil. | Damper 80 to 30 MPH. | Time lag Gov. to Damper. Data: 90 | 3 | 6 | 3 | 3 | 7 | 4 180 | 3 | 6 | 3 | 3 | 8 | 5 360 | 3 | 6 | 3 | 3 | 8 | 5 "Compressor Oil" was used throughout the system. Damper temp. approx. 50°C. Hw/W.Bell. | ||