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).
Performance data and specifications for 'DENSA' linings, including pressure tables and friction coefficients.
| Identifier | ExFiles\Box 141\3\ scan0155 | |
| Date | 30th January 1933 guessed | |
| "DENSA" Linings will give a long useful life when used with pressures not greater than 170 lbs/sq.in. When dissipating 1.3 H.P. per sq. in. of surface area the following table gives the pressures required with different speeds. Average co-efficient of friction .37. Speed in ft/min. Pressure in lbs/sq. in. 500 180* 1000 120 1500 80 2000 60 2500 46 3000 40 3500 35 4000 30 *Pro rata this should be 240 lbs/sq.in. but the co-efficient of friction increases slightly with lower speeds. The above figures were obtained with a dry Brake Drum. If the drum is immersed in water or oil due allowance must be made, for the co-efficient of friction will be lowered. Co-efficient of friction in water .2 - .3 " " " oil .02 - .08 "DENSA" Lining is very popular for Clutch Rings, and can be supplied in this form of any dimensions. The principal Road Transport Company in this Country uses "DENSA" Brake Linings exclusively on all its vehicles. This firm has in service 100-ton lorries which are the most powerful vehicles employed by any Transport Company, and the service of "DENSA" for this work has been found to give, after prolonged and exhaustive tests, better service as regards braking efficiency and durability than any other Lining employed. | ||