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).
Progress report on investigations into the working efficiency of the Lockheed hydraulic brake system.
| Identifier | ExFiles\Box 120\3\ scan0032 | |
| Date | 9th November 1932 | |
| Mr. Boughton Mr. Burdon Mr. Van Vestraut Mr. Rollings Board Room RER/REB. 9.11.32.5. LOCKHEED HYDRAULIC BRAKE CO. LTD. Experimental department. PROGRESS REPORT .. ITEM NO.24. INVESTIGATIONS TO ASCERTAIN THE WORKING EFFICIENCY OF THE LOCKHEED SYSTEM. Test on : 1" Barrel Type Master Cylinder with 1" Wheel Cylinders, arranged as shown on Sketch XP. 126 attached. Object of Test : To ascertain the working efficiency of the Lockheed System. Apparatus : As shown on Sketch XP.126. Testing Procedure : Various pedal loads were applied by means of a spring balance to the pedal pad. Readings were taken on Gauges A and B as it was found that there was no difference in the reading of the Gauges at A and the one coupled to the front of the Master Cylinder. In the case of the first set of figures given below, the test was taken with 12 feet of 1/4" Copper Tubing, and three 16 1/2" Hoses. The efficiencies are shown under two headings: one, that giving the actual efficiency in the first Wheel Cylinder, and the other giving the efficiency of the rear unit operated by the Wheel Cylinder. COLUMN 1 gives the actual loads applied at the pedal. COLUMN 2 gives the effective load on the pedal, using a pedal ratio of 6 to 1, and deducting from this effort the effort given by the spring in the Master Cylinder. This gives an actual effective load as shown in this column. COLUMN 3 shows the theoretical loads per square inch with this effective load applied. COLUMN 4 gives the reading with gauge A in pounds per square inch, this efficiency being given in Column 5. COLUMN 6 shows the gauge reading found on the second gauge and the efficiency in the rear closed cylinder. The second table of figures shows the same tests but with the Hoses removed. I do not think that the Hoses have very much effect upon the figures although the readings are slightly different. These small discrepancies can be attributed to the use of the apparatus involved, such as slight errors in scale pans and gauges. contd..... | ||