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).
Costs, development, and design changes for Armstrong Dampers.
| Identifier | ExFiles\Box 152\2\ scan0093 | |
| Date | 2nd November 1937 | |
| ARMSTRONG DAMPERS. 2.11.37. Re: HPS. {Horace Percy Smith - Experimental Factory Mgr} 3/VS. {J. Vickers} 28.10.37. 1200 hours at 2/- an hour means £120. The project of Armstrong Dampers was to save £10 per chassis on the Bentley. The latest Armstrong Damper bought out saves £9/10/- per chassis. RHC {R. H. Coverley - Production Engineer} 's estimate for the Armstrong Damper produced in our Works saves £7 per chassis. This means that the £120 development cost would be paid in 17 chassis. The only machining we have done on Armstrong Dampers is for Bentley III. -------- Out of the 48 damper castings supplied to Armstrongs the first 8 were not of the latest type, and the next 8 were returned to us, as they were faulty castings. The following changes have taken place since delivery of the first damper:- (1) Orifice restriction to valve type. (2) Mild steel shafts to nickel steel. (3) Zinc base casings to alum. (4) Large diameter shafts. (5) Bushes for bearings. (6) Split inter lever allowing shafts to be detachable. (7) Stronger links. (8) 6 different designs of valve assemblies. ---------- | ||