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 a chassis part, changing the piston design to use five narrow rings instead of three narrow and one wide.
| Identifier | ExFiles\Box 172\1\ img102 | |
| Date | 6th April 1927 | |
| RR 785 REVISED (10M) (DE 649 9-12-26) BM. 2/1187 ORIGINAL COMPLETED 25.5.27 STANDARDISATION of CHASSIS PARTS. Date 6.4.27 X No. 5040 Drawing No. Part List Description of Parts. "PISTON WITH 5 NARROW RINGS - INSTEAD OF 3 NARROW AND ONE WIDE AS AT PRESENT." Origin. To improve design. Experimental Test Report. The present standard piston on 20 HP. has 3 rings .100" wide and one .187" wide. The proposal is to fit 5 rings .100" wide - this can be done without altering position of the top ring. See drg. E.53955. Road Test Report. Fitted to 9-G-111 - run 8600 miles. Fitted to 11-G-111 - run 3700 miles. These are an improvement as regards gas tightness and reduce the tendency for ring to squeak. [Green Stamp: 20. H.P. CHASSIS] Weight of Old Part. Weight of New Part. Difference per Car. Cost of Old Part. £2. 4. 6d. Cost of New Part. £2. 10. 1d. Difference per Car. £ 5. 7d. increase. Signature from Cost Dept. that above is correct. My/Rb.{R. Bowen} 12.4.27. A Scrap and replace at all costs, including Chassis already delivered to Customers. B Scrap and replace on Chassis in Works. C Scrap present stock and replace on all Chassis not yet handed to test. D Use existing stock Alteration effective on future Chassis. Cost of Parts in Works which will be scrapped if commenced on :- Series.........£....... Series.........£....... Series.........£....... INITIAL | DATE | REMARKS BJ. | 25.5.27 | Agreed. B.Johnson. R.{Sir Henry Royce} | 11/4/27 | Agreed F H RoyceSir Henry Royce WOR.{Arthur Wormald - General Works Manager} | 6.4.27 | Agreed. Wor.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} | 13.4.27 | Agreed. Rg.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 8.4.27 | Agreed. DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 7.4.27 | Agreed. BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 17.4.27 | Agreed. EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 11/4/27 | Agreed A Rowbotham PN.{Mr Northey} | | CWB. | 5.5.27 | Agreed. CWB. HS.{Lord Ernest Hives - Chair} | 6.4.27 | Agreed. E.Hives. | ||