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).
Feedback on a car's adopted braking scheme, including pedal pressure, servo, safety, production parts, and steering.
| Identifier | ExFiles\Box 73\1\ scan0180 | |
| Date | 5th June 1924 | |
| 49910 SECRET. To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c.c. to CJ. BJ. c.c. to RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} c.c. to E.{Mr Elliott - Chief Engineer} PN.{Mr Northey} EP.{G. Eric Platford - Chief Quality Engineer} RE. CAR WITH ADOPTED SCHEME OF BRAKING. PEDAL PRESSURE. The car and brakes appear very satisfactory. If at all wrong the pedal pressure required is too light. OIL ON SERVO. Hancock informs me that the effectiveness of the servo is not easily spoilt by oil. Such a test might be carried further. SAFETY AND proportionate BRAKING. The brakes appear very safe and I definitely prefer skidding the back wheels first, the proportions obtained from your test of 1.5 rear to 1 front, being almost exactly my suggested amounts of 8 & 5, which equals 1.6 to 1. PRODUCTION PARTS. I am extremely pleased with the appearance of the parts around the servo as they seem efficient, light and inexpensive, all being good pieces to make. A slight increased clearance should be obtained between balance lever bolt and the outer suspension link, and between gearbox bridge and nearest boss on servo. STEERING. Regarding the steering I was pleasantly surprised to find this so light and free as from shocks. I should have feared that the control was insufficiently rigid for high speed but am assured by Hancock that no disadvantages was experienced. It therefore shews that to avoid road shocks the nearest way is the low rating buffer springs in the longitudinal tube (the little back lash observed can be avoided). Hancock says that the trouble the heavy steering is due to difficulty of lubrication of the vertical pivot pins. This car was good after its fairly contd:- | ||