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).
Tests of various hand pumps for Phantom III hydraulic jacks.
| Identifier | ExFiles\Box 139\1\ scan0179 | |
| Date | 24th June 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} X1166 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}12/KW.24.6.36. Phantom III Hydraulic Jacks. We have now carried out tests on the various hand pumps submitted by Sessions' for test. The results are as follow, shown compared to previous information: | Identification | Piston dia. | Type | Piston clearance | Max. Press. | No. of strokes to raise front of car. | | :--- | :--- | :--- | :--- | :--- | :--- | | 36-EX | 3/4" | Port | .0004" | 3000 | | | Production May 1936 | 9/16" | Valve | | 5000 | | | **Experimental Pumps** | | | | | | | No. 1 | 3/4" | Port | .0002" | 3100 | 218 | | No. 2 | 3/4" | Valve | .0001" | 3100 | 173 | | No. 2 modified | 3/4" | Valve | .0006" | 2200 | 176 | | No. 3 Release Valve | 9/16" | Valve | | 2300 | 315 | | No. 4 Low Press. | 9/16" | Valve | .0017" | 2100 | 425 | We have already recommended the 3/4" port type pump for production, owing to having had most experience with this on 36-EX. The number of strokes required with the 9/16" pump we can now say is excessive. The slight advantages that might be gained by a valve pump would we think be outweighed by the increased freedom from troubles with the port arrangement. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||