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).
Design proposal for a single ratchet after a servo scheme, including a diagram and performance calculations.
| Identifier | WestWitteringFiles\L\April1924-June1924\ Scan75 | |
| Date | 24th April 1924 guessed | |
| v 4 (2) 26 SINGLE RATCHET AFTER SERVO SCHEME. How to neatly & strongly carry them the pawls and spring I leave to you. Both down to balance lever. 2" travel. 3" travel. Possibly thread preferred. 3 pairs of pawls (6). One third pitch. About 3". Bearing may be in either of these 3 positions but must not be able to bind this lever or its boss. To foot pedal - 3" travel. Ratchet teeth on large disc not too fine to be delicate - say 3 per inch = 30 teeth: 3 sets of pawls - 3/90 - 4° per tooth. It may pick up 10 to 15 teeth. The alteration is so simple that the above requires little explanation. If servo takes 90° for fully worn brakes fully on, then even one way probably takes 60° before brakes come on. If we arrange as above foot pedal may jump equal to 15 teeth of 4°, and makes - 36" X π X 10 / 3.6 X 6 = 100 X 22 / 7 X 6 = 2200 / 42 = 4 ft at very slow speed, Road wheel. Back axle ratio. 360/60 Servo ratio. and may be sufficient-ly on in 12". R.{Sir Henry Royce} | ||