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 20 HP stiffer crankshaft.
Identifier | ExFiles\Box 137\4\ scan0008 | |
Date | 24th April 1929 | |
RR 755 REVISED (10H) (D.C. 777-29-2-28) MC C.LTD X634 COMPLETE 25.10.29 STANDARDISATION of CHASSIS PARTS. Date 24.4.29 X No. 5010 Drawing No. X634 Part List Description of Parts: 20 HP. STIFFER CRANKSHAFT. Origin: To overcome vibrations and improve design. Experimental Test Report: This crankshaft is approx. 50% stiffer than present standard and has larger bearing area. The pin size has been increased from 1.5" to 1.75" and journal size from 2.00" to 2.125". Road Test Report: Run 12,000 miles on 14-G4. Run 7,800 miles on 12-G4. [ ] A Scrap and replace at all costs, including Chassis already delivered to Customers. [ ] B Scrap and replace on Chassis in Works. [X] C Scrap present stock and replace on all Chassis not yet handed to test. [ ] D Use existing stock Alteration effective on future Chassis. Weight of Old Part. Cost of Old Part: £ 43. 4. 1 Weight of New Part. Cost of New Part: £ 43. 17. 1 Difference per Car. Difference per Car: £ 0. 13. 0 increase. Signature from Cost Dept. that above is correct: C/AHD. 24.5.29. C. Cost of Parts in Works which will be scrapped if commenced on :- Series.........£........ Series.........£........ Series.........£........ APPROVALS TABLE: INITIAL | DATE | REMARKS Sg.{Arthur F. Sidgreaves - MD} Sg.{Arthur F. Sidgreaves - MD} | 28.5.29 | Agreed. Sg.{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce} | 8.5.29 | Agreed. FHR. WOR.{Arthur Wormald - General Works Manager} | | RG.{Mr Rowledge} | 30.4.29 | Agreed. RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 27.4.29 | Agreed. Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 25.4.29 | Agreed. BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 29.4.29 | Agreed. EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 26.4.29 | Agreed. E.{Mr Elliott - Chief Engineer} PN.{Mr Northey} | 24.5.29 | Agreed. PN.{Mr Northey} CWB. | 29.5.29 | Agreed. C. Hs.{Lord Ernest Hives - Chair} | 24.4.29 | Agreed. Hs.{Lord Ernest Hives - Chair} [WATERMARK: G.O. HP CHASSIS] | ||