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).
The performance and issues with a hydraulic pump, jacks, and brackets after 10,000 miles of testing.
| Identifier | ExFiles\Box 139\2\ scan0247 | |
| Date | 14th May 1935 | |
| -2- Hs{Lord Ernest Hives - Chair}/Bwg.{J. C. Bowring}6/KW.14.5.35. 5-B-IV Hydraulic Pump. Previous to the commencement of the 10,000 miles, we experienced the following trouble. Having jacked the car up, the release valve jambed, so that it was impossible to lower the car without loosening the pipe line unions and so allow the fluid to escape. This was traced to an error in design which allowed the valve to lock on its seating, and has since been rectified. Jacks, front and rear. Have so far proved satisfactory. Jack Brackets. Rear, so far satisfactory. Front, in two instances these brackets have fractured and we are making immediate arrangements for the strengthening of these. Pipe Lines. Steel pipes and Lockheed flexes - no trouble. Summing up, we would say that we have not had a complete "Jackall" system to withstand our tests for any length of time, but they are much more reliable now than when we first tried them out. We must await the completion of the 10,000 miles on 5-B-IV before passing further reports. Da.{Bernard Day - Chassis Design} is successfully applying hydraulic Jacks to the SpectreCodename for Phantom III chassis, the scheme being at a fairly advanced stage. Hs{Lord Ernest Hives - Chair}/J.Bowering. | ||