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 bonded asbestos plate clutch linings.
| Identifier | WestWitteringFiles\J\February1923\ Scan57 | |
| Date | 29th January 1923 | |
| Messrs Rolls Royce. January 29th, 1923. Copy of Test Results. Taken on Ferodo Bonded Asbestos Plate Clutch Linings. Rolls Royce Size 10.5" O.D. 8.4" I. D.{John DeLooze - Company Secretary} R.P.M. TORQUE. H.P. PRESSURE lbs. C.O.F. TEMPT. REMARKS. 1000 105 ft.lbs.20 " 575 .46 78°F.{Mr Friese} Pick up. " " " 680 .39 380°F.{Mr Friese} " " " " 560 .475 78°F.{Mr Friese} Static (no slip) " " " 640 .416 380°F, " " " " 1000 .266 400°F.{Mr Friese} Full slip sustained. One face of the lining against a M.S. plate. 1000 105 ft.lbs.20 " 620 .429 78°F.{Mr Friese} Pick Up. " " " 720 .369 380°F.{Mr Friese} " " " " 580 .459 78°F.{Mr Friese} Static no slip. " " " 1000 .266 400°F.{Mr Friese} 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. | ||