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).
Test results for Ferodo Bonden Asbestos plate clutch linings against different plate materials.
| Identifier | WestWitteringFiles\J\February1923\ Scan54 | |
| Date | 30th January 1923 guessed | |
| Copy of Test Results. Taken on Ferodo Bonden Asbestos Plate Clutch Linings. Rolls-Royce Size 10.5" O.D. 8.4" I.D. | R.P.M. | Torque. | H.P. | Pressure lbs. | C.O.F. | Temp. | Remarks. | |---|---|---|---|---|---|---| | 1000 | 105 ft.lbs. | 20 | 575 | .46 | 78°F | Pick up. | | " | " | " | 680 | .39 | 380°F | " | | " | " | " | 560 | .475 | 78°F | Static - no slip. | | " | " | " | 640 | .416 | 380°F | " | | " | " | " | 1000 | .266 | 400°F | Full slip sustained. | One face of the lining against a M.S. plate. -------------------- | | | | 620 | .429 | 78°F | Pick up. | |---|---|---|---|---|---|---| | " | " | " | 720 | .369 | 380°F | " | | " | " | " | 580 | .459 | 78°F | Static - no slip | | " | " | " | 1000 | .266 | 400°F | Full slip sustained. | One face of the lining against a Tyzack hardened and tempered plate. -------------------- The above results are the best and worst obtained at low and high temperatures. Note. With two pairs of friction surfaces 500 + 100 lbs. should always be in excess of the requirements to absorb the full expressed power of the engine and bring it to rest quickly. -------------------- | ||