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 40/50 HP. Dynamo 28 slot armature to improve silence and commutation.
| Identifier | ExFiles\Box 68\4\ scan0043 | |
| Date | 20th July 1928 | |
| RR 755 REVISED (10H) (D.C. 777 - 29 - 2 - 28) MS C. LTD X8672 COMPLETED 2.10.28 STANDARDISATION of CHASSIS PARTS. Description of Parts. 40/50 HP. DYNAMO - 28 SLOT ARMATURE. Origin. Further improvement to the silence and commutation of the machine. Experimental Test Report. As previously reported we are practically free from magnetic noise with the present std. 29 slot armature used with the narrower brush, larger air gap, machine. Tests shew however that a further small improvement is realised by the use of a 28 slot armature, the appearance of which, compared with std., is the same. The use of this arm: cured Test Dept. cases of magnetic noise on the old type wide brush machine. Road Test Report. Run 7211 miles on 12-EX. " 5806 " " 9-EX. It is considered unnecessary to complete 10,000 miles on the machine before standardisation is effected. Weight of Old Part. Cost of Old Part. £4-4-6 Weight of New Part. Cost of New Part. £4-4-6 Difference per Car. Difference per Car. £ None Signature from Cost Dept. that above is correct. G.R.W. 1/10/28 [Right Side Panel] X No. 8672 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. 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 BJ. | 2.10-28 | agreed R.{Sir Henry Royce} | 25.7.28 | Agreed. | FHR. WOR.{Arthur Wormald - General Works Manager} | 23.7.28 | Agreed. | Wor.{Arthur Wormald - General Works Manager} RG.{Mr Rowledge} | 24.7.28 | Agreed. | RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 23.7.28 | Agreed. | DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 9.8.28 | Agreed. | BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 24.7.28 | Agreed. | EP.{G. Eric Platford - Chief Quality Engineer} E.{Mr Elliott - Chief Engineer} | 25.7.28 | Agreed. | E.{Mr Elliott - Chief Engineer} PN.{Mr Northey} | 25.7.28 | Agreed. | PN.{Mr Northey} CWB. | 21.7.28 | Agreed. | CWB. HS.{Lord Ernest Hives - Chair} | 20.7.28 | Agreed. | Hs.{Lord Ernest Hives - Chair} | ||