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 and improve design.
| Identifier | ExFiles\Box 6\1\ 01-page165 | |
| Date | 24th April 1929 | |
| AD. 752 REVISED (10m) [n.d. 777 - 20 - 2 - 28] - 50" C.L.Y. X 5010 Completed 29/5/29. STANDARDISATION of CHASSIS PARTS. Date 24.4.29 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 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. [STAMP: Received 28 APR 1929] [STAMP: WORKS ARCHIVES] Weight of Old Part: Weight of New Part: Difference per Car: Cost of Old Part: £45- - Cost of New Part: £45-17-1 Difference per Car: £0-17-1 increase. Neto. Signature from Cost Dept. that above is correct. GRL 24/4/29. GRL 29/5/29 [Right Column] X No. 5010 Drawing No. Part List 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. Cost of Parts in Works which will be scrapped if commenced on :- Series.........£....... Series.........£....... Series.........£....... [Approval Table] INITIAL | DATE | REMARKS EX SE. | 28.5.29 | Agreed Sq. 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} | | C.WK | 29.5.29 | Agreed. C. HS.{Lord Ernest Hives - Chair} | 24.4.29 | Agreed. Hs.{Lord Ernest Hives - Chair} | ||