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).
Suggested design for a 3rd speed brake system, with a self-servo one-direction brake.
| Identifier | WestWitteringFiles\U\2January1930-September1930\ Scan034 | |
| Date | 10th February 1930 guessed | |
| SUGGESTED BRAKE DESIGN IF 3rd. SPEED HAS BRAKE ONLY (NO PAWLS.) LOOKING FROM ENGINE. SKETCH 3. Self servo one direction brake for 3rd. speed. With or without flexible joint here. Balanced brake for half or full engine torque. | ||