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).
Specifications for friction devices on 20 HP pivots, for models with and without front wheel brakes.
| Identifier | ExFiles\Box 106\3\ scan0015 | |
| Date | 1st August 1925 | |
| C O P Y. Hs{Lord Ernest Hives - Chair}/CAP/LG20. 8. 25. PARTICULARS OF FRICTION DEVICES ON 20 HP. PIVOTS. G.11. PIVOTS (NO FRONT WHEEL BRAKES). No. of friction washers keyed to pivot pin = 3 " " " " " stub axle = 2 " " floating friction washers = 1 No. of pairs of effective friction surfaces = 5 per pivot. Total effective friction area (per pivot) = 4.566 sq.in. Effective radius = .552" ------------------- G.111. PIVOTS )FRONT WHEEL BRAKES). No. of friction washers (floating) = 1 No. of pairs of effective friction surfaces = 1 per pivot. Total effective friction area 1.080 sq.in.} Production Effective radius .495" } G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 51848 ------------------- Hs{Lord Ernest Hives - Chair}/CAP. | ||