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).
Standardisation of parts document for the Front Brake Damper (Gordon-Armstrong Hydraulic Damper).
| Identifier | ExFiles\Box 171\5\ img078 | |
| Date | 15th November 1938 | |
| RR 755A (10H) (49998) 19/10/37 C.E.Co. LS COMPLETED DATE 28.4.39. WRAITH 25/30 H.P. STANDARDISATION OF PARTS Date Issued 15.11.38 Sheet No. W.15. Drg. No. SCD.805. L.O.P.S. Description: FRONT BRAKE DAMPER. (Gordon-Armstrong Hydraulic Damper) Purpose: To provide a more consistant way of preventing brake thumps and to simplify the brake system. Brief Report and Remarks: Fitted to 25.G.VI and 29.G.VI and will be fitted to Mx{John H Maddocks - Chief Proving Officer}'s. car 27.G.VI. An identical damper has run in France on 8.B.V. (which has done 11,000 miles so far) thus proving its endurance. The damper is actually designed for the more arduous duty of suspension damping. The damper replaces the brake idler lever on the engine, the swinging arm friction damper, and the servo-reverse link rubber. When recommended for Introduction: 1st. car in 'C' series. Report References: By Rm{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design} Mx{John H Maddocks - Chief Proving Officer} Old Parts - Material £3.19.5, Labour £3.8.3, Burden £5.19.6, Total £13.7.2 New Parts - Material £4.1.3, Labour £3.5.10, Burden £5.15.3, Total £13.2.4 Decrease in Cost £0.4.10. G/RL 13/1/39. Production Position and Comments: Cost of Tools £16.0.0. The Gordon Armstrong Hydraulic Front Brake Damper to prevent brake thumps and simplify the brake system has been instructed for the 1st. chassis in 'C' series and involves scrapping parts surplus to 'A' and 'B' series, value £0.10.0d. A tool cost of £16.0.0d. is involved but there is a decrease in Factory cost of 4/10d. per chassis. The combined cost of tools and surplus parts value £16.10.0d. will thus be recovered after producing 68 chassis, i.e. at the 68th. chassis in 'g' series. RHC{R. H. Coverley - Production Engineer} Authorisation to Proceed. Signature: Sg.{Arthur F. Sidgreaves - MD} Date: 26/4/39 Signature: Hs.{Lord Ernest Hives - Chair} Date: 26/4/39 Introduce on the 1st Chassis in C Series. | ||