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).
List of modifications for a 20 HP Chassis after 10,000 miles, specifically for the clutch and footbrakes.
| Identifier | ExFiles\Box 5a\2\ 02-page159 | |
| Date | 10th February 1930 | |
| G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Dept. [crossed out] F.{Mr Friese} Dept. [crossed out] c. Hs.{Lord Ernest Hives - Chair} [crossed out] C. Gs. [crossed out] V58606 BY1/G.10.2.30. 20 HP. CHASSIS. 10,000 MILES. The above car which is due out of here in about a week should be fitted with the following modifications :- 1/- CLUTCH. a/- Spring pressure increased 20% b/- Surfaces increased as much as possible on existing parts. c/- Foot pedal leverage. The stroke of the pedal should be increased 20%, that is, the small lever should be reduced in length to arrive at this end. 2/- FOOTBRAKES. a/- The amount of direct braking to be reduced 25% by reducing the length of the lever on the rear brake differential coupling up to the servo cam. DA.{Bernard Day - Chassis Design} remarks that this will reduce the total braking by 8%. This, however, is to be neglected. b/- Thickening up the Ferodo facings on the rear brake shoes from .312 to .375". This is to be arrived at by reducing the depth of the aluminium shoe by .062", and to keep the strength correct we should increase the thickness of the top flange of the shoe by .075". BY.{R.W. Bailey - Chief Engineer} | ||