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).
Second modification for future work on the 20 HP Bijur clutch system.
| Identifier | ExFiles\Box 40\5\ Scan189 | |
| Date | 14th July 1927 | |
| X. 3587 To Hs.{Lord Ernest Hives - Chair} EFC. from R.{Sir Henry Royce} and E.{Mr Elliott - Chief Engineer} BY.{R.W. Bailey - Chief Engineer} c. to BJ. Wor.{Arthur Wormald - General Works Manager} R4/M14.7.27. 20 HP. RR. BIJUR. The second modification for future work consists of light springs well set up - i.e. low rating and clutch with increased number of plates. The advantages are - (1) Hold-off spring still low pressure and low rating - i.e. 1 to 2 lbs. (2) Pinion cushion spring drive also increased initial friction, can be as low as original, say 5 to 7 lbs., and yet give initial friction of about 2 1/2 times. (3) Clutch proper will be definitely self grabbing, but limited to friction of three faces, plus slight collar generated by 90 lb. springs, which is sufficient for any engine, even cold, and should be 600 lbs. inches on engine, - i.e. 70 lbs.ins. on motor. Motor spindles must be lengthened say .25 for the above, and threaded end increased from 7/16ths. to 1/2, locked by plate washer, which should be done at once: bore up for lubrication. R.{Sir Henry Royce} | ||