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 lower gear back axle, changing the ratio from 16 x 52 to 15 x 52.
| Identifier | ExFiles\Box 171\3\ img058 | |
| Date | 20th August 1920 | |
| R.R. 785 (S H) (S.A. 325. 25-2-15) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 6961. ORIGINAL COMPLETE 8.9.20 STANDARDISATION of CHASSIS PARTS. Date 20.8.20. Description of Parts. Lower gear back axle. 15 x 52 instead of 16 x 52. X 3545. Drawing No. 3985/S. Part List. Origin. In order to improve hill climbing and acceleration of cars fitted with heavy bodies. Experimental Test Report. We have been able to obtain quiet axles of this type. The acceleration is much improved, maximum speed remains the same. This gear ratio is especially suitable for cars with heavy bodies and cars for use in U.S.A. and the colonies. Signature of Exp. Dept. that above is correct. E.{Mr Elliott - Chief Engineer} Hives. Road Test Report. Run 10,000 miles on 49GB. Run 3,000 " " 4EX. Run 3,000 " " 6EX. Weight of Old Part. Cost of Old Part £ Weight of New Part. Cost of New Part £ Difference per Car. Difference per Car £ Cost of Parts in Works and Stores which will be scrapped if commenced on:- Series... £... Series... £... Storekeeper advised re above. Storekeeper's Signature. Signature of Mr. DeLOOZE that above is correct. SIGNATURES | DATE | REMARKS Mr. JOHNSON. | 5.9.20. | Agreed. CJ. Mr. ROYCE. | 6/9/20 | Agreed F.H.R. agrees with the report Mr. WORMALD. | 27.8.20 | Agreed but only in small numbers. WJW Mr. NADIN. | | Mr. PLATFORD. | 21.8.20. | Agreed - Standard for all cars and if satisfied can produce quiet. EP.{G. Eric Platford - Chief Quality Engineer} Mr. NORTHEY. | 2.9.20. | Agreed. PN.{Mr Northey} Mr. Bailey. | 23.8.20. | Agreed. By.{R.W. Bailey - Chief Engineer} Mr. Barrington. | 21.8.20. | Agreed. Bn.{W.O. Bentley / Mr Barrington} Mr. Day. | 23.8.20. | Agreed - for use as an alternative to 16/52 in suitable cases. Da.{Bernard Day - Chassis Design} | ||