Redesign of a petrol pump from sylphon tubes to a fabric diaphragm due to cost.
| Identifier | ExFiles\Box 17\5\ Scan073 | |
| Date | 4th May 1931 | |
| Hs. {Lord Ernest Hives - Chair} } FROM R & E. {Mr Elliott - Chief Engineer} Ev. {Ivan Evernden - coachwork} } c. Sg. {Arthur F. Sidgreaves - MD} Wor. {Arthur Wormald - General Works Manager} c. HV. RHC. {R. H. Coverley - Production Engineer} X7460 RL/M4.5.31. PETROL PUMP. X.7460 X.5460 X.2677. In consequence of the high cost of sylphon tubes we have altered our pump design to a fabric diaphragm, hoping that it will prove quite reliable for 2 or 3 years, and our design is simpler than A.C., which has a curious drag link of unnecessary complication. It is especially designed to suit P.2. engine and will be arranged in perhaps a better position in J.1 and 3. For a long time I have favoured a pump instead of the autovac, which is now more complicated and costly. The pump giving a constant head and a large reserve of capacity has made the problem still simpler and more satisfactory. We will work at these designs until they are as efficient in cost/value as others, and the Works will say whether they will make or buy. If they can make at say cost to buy, plus 25%, and contribute something towards charges, say 150% on time and 20% on material, then it would be better for Derby to make. All purchased parts or materials should carry 20% of charges for buying etc. R. {Sir Henry Royce} | ||
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).