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).
Table of pressure readings for 25 HP production governor units.
| Identifier | ExFiles\Box 105\3\ scan0352 | |
| Date | 13th July 1934 | |
| 45520 PRESSURE READINGS FOR PRODUCTION GOVERNOR UNITS, 25 HP. Main Table: | Speed Spindle R.P.M. | Speed Road M.P.H. | Gov. Range lbs/sq.in. | Hand Control Maximum. | Main Release Range. | |----------------------|-------------------|-----------------------|-----------------------|---------------------| | 63 | 10 | 1 | 15 | 25 | | 127 | 20 | 1.75 | 16 | 27 | | 190 | 30 | 3 | 17.5 | 28.5 | | 253 | 40 | 4.5 | 18.5 | 30 | | 316 | 50 | 6 | 20 | 31 | | 380 | 60 | 8 | 22 | 32 | | 443 | 70 | 10.5 | 23 | 34 | Quadrant Notch Table: | Quadrant Notch Range 10 MPH. Notch | Quadrant Notch Range 10 MPH. lbs/sq." | |------------------------------------|---------------------------------------| | Min. | 1 | | 2 | 1 | | 3 | 1.25 | | 4 | 2.5 | | 5 | 5 | | Centre | 7.25 | | 7 | 9.25 | | 8 | 11 | | 9 | 12.5 | | 10 | 14 | | Max. | 15 | These figures were taken on 18-G-IV car using the first 25 HP. Production Unit. N.B. The main release range is taken with the Hand Control Valve solid, so that all the oil has to escape through the Main Release Valve. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} 13.7.34. | ||