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 to overcome vibrations.
| Identifier | ExFiles\Box 172\1\ img148 | |
| Date | 24th April 1929 | |
| RR 755 REVISED (10H) (D.C. 777 - 29 - 2 - 28) M C.LTD COMPLETED 29. 5. 29 STANDARDISATION of CHASSIS PARTS. Date 24. 4. 29 Description of Parts. 20 HP. STIFFER CRANKSHAFT. Drawing No. X No. 5010 Part List Origin. To overcome vibrations and improve design. Experimental Test Report. This crankshaft is approx. 50% stiffer than present standard and has larger bearing areas. The pin size has been increased from 1.5" to 1.75" and journal size from 2.000" 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. 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. £ 45. 4. 1 Weight of New Part. Cost of New Part. £ 45. 17. 1 Wor.{Arthur Wormald - General Works Manager} EWT. Difference per Car. Difference per Car. £ 0. 13. 0 increase. Signature from Cost Dept. that above is correct. G/Hb.{C. E. Harcombe} 24. 5. 29. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Cost of Parts in Works which will be scrapped if commenced on :- Series........£....... Series........£....... Series........£....... INITIAL | DATE | REMARKS EXC Sg.{Arthur F. Sidgreaves - MD} | 28. 5. 29 | Agreed. Sg.{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce} | 8/5/29 | Agreed HFR 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} C (WEX struck out) | 29.5.29 | Agreed. C. Hs.{Lord Ernest Hives - Chair} | 24.4.29 | Agreed. Hs.{Lord Ernest Hives - Chair} | ||