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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]
  
  


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