Standardisation document for a modification to the tyre tread pattern to improve grip.
| Identifier | ExFiles\Box 65\2\ scan0338 | |
| Date | 7th October 1930 | |
| RR 755 (10H) (3-7-30) BM. 6/2571. STANDARDISATION of CHASSIS PARTS. Description of Parts: MODIFICATION TO TREAD PATTERN ON TYRES. Origin: To improve grip on the road. Experimental Test Report: This pattern tread is similar to the present except it has transverse grooves in the tread. Road Test Report: Run approx 5000 on London Trials cars. Run 1,000 miles on expl. cars. Date: 7.10.30. X No: 4050 Ch. No: 7820 Drawing No: 5820 Parts List: A Scrap and replace at all costs, including Chassis already delivered to Customers. B Scrap and replace on Chassis in Works. C Scrap and replace on all Chassis not yet handed to test. D Use existing stock Alteration effective on future Chassis. [Stamped across the document: PHANTOM II ON 20/25 H.P. CHASSIS.] P.II / 20/25 HP Weight of Old Part. Weight of New Part. Difference per Car. Cost of Old Part. £13.17.7d. / £12.7.6d. Cost of New Part. £13.17.7d. / £12.7.6d. Difference per Car. £ Nil. / £ Nil. Cost of Parts in Works which will be scrapped if commenced on:- Series.........£....... Series.........£....... Series.........£....... Signature from Cost Dept. that above is correct. G {Mr Griffiths - Chief Accountant / Mr Gnapp} /S/D. 8.11.30. G.10.11.30. W.R. INITIAL | DATE | REMARKS SG. {Arthur F. Sidgreaves - MD} | 11.11.30 | Agreed Sg. {Arthur F. Sidgreaves - MD} R. {Sir Henry Royce} | 20.10.30 | Agreed FHR. WOR. {Arthur Wormald - General Works Manager} | 4.11.30 | Agreed Wor. {Arthur Wormald - General Works Manager} C. | | Agreed C. RG. {Mr Rowledge} | 5.11.30 | Agreed Rg. {Mr Rowledge} DA. {Bernard Day - Chassis Design} | 10.10.30 | Agreed Da. {Bernard Day - Chassis Design} BY. {R.W. Bailey - Chief Engineer} | 8.10.30 | Agreed By. {R.W. Bailey - Chief Engineer} EP. {G. Eric Platford - Chief Quality Engineer} | 9.10.30 | Agreed EP. {G. Eric Platford - Chief Quality Engineer} E. {Mr Elliott - Chief Engineer} | 10.10.30 | Agreed AE. PN. {Mr Northey} | 10.10.30 | Agreed as an alternative to the buttress. PN. {Mr Northey} HS. {Lord Ernest Hives - Chair} | | Agreed. | ||
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).