Progress report on investigations to ascertain the working efficiency of the Lockheed hydraulic brake system.
| Identifier | ExFiles\Box 120\3\ scan0033 | |
| Date | 9th November 1932 | |
| RER/REB. 9.11.32. - 2 - LOCKHEED HYDRAULIC BRAKE CO. LTD. PROGRESS REPORT .. ITEM NO.24. INVESTIGATIONS TO ASCERTAIN THE WORKING EFFICIENCY OF THE LOCKHEED SYSTEM. Contd.... | Pedal load lbs. | Effective load with pedal ratio & account of spring lbs. | 1" Cyl. Theoretical load lbs./in2. | Gauge A lbs/in2 | Efficiency | Gauge B lbs/in2 | Efficiency | |---|---|---|---|---|---|---| | 50 lbs. | 300- 9 =291 | 370 | 330 | 89.2 % | 300 | 82.1 % | | 100 " | 600-10 =590 | 752 | 660 | 87.8 % | 630 | 83.8 % | | 150 " | 900-12 1/2=888 1/2 | 1130 | 980 | 86.7 % | 940 | 83.2 % | - With three Hoses - | 50 lbs. | 300- 9 =291 | 370 | 335 | 90.5 % | 305 | 82.5 % | | 100 " | 600-10 =590 | 752 | 666 | 88.5 % | 634 | 84.5 % | | 150 " | 900-12 1/2=888 1/2 | 1130 | 993 | 88.0 % | 953 | 84.5 % | - Without three Hoses - Conclusion : The loss of efficiency is attributable to two causes: the actual frictional loss at the fulcrum pin, and the pin connecting the Master Cylinder Piston. This, using a co-efficient of friction of .1, and in the case under review, a 3/4" pin 1" long, as the fulcrum pin, and a 5/16" pin 7/8" long for the Master Cylinder Piston, gives a total loss of 4 per cent. The difference between this loss and the total loss is accounted for by the friction of the cups on the walls, and also a small amount of energy absorbed by the gauges. Action taken : Report issued to :- Mr. Boughton Mr. Burdon Mr. Van Vestraut Board Room ------------------ooo---------------- | ||
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).