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).
Dynamo performance on Bentley cars, particularly the issue of late cutting in speed and potential solutions.
| Identifier | ExFiles\Box 62\3\ scan0476 | |
| Date | 18th December 1934 | |
| LA.{L. A. Archer} From Ha/Wst. c.c. to Wor.{Arthur Wormald - General Works Manager} c.c. to E.{Mr Elliott - Chief Engineer} c.c. to By.{R.W. Bailey - Chief Engineer} c.c. to JLE.{J. Lee Evans - Chassis Test Manager} Y 6142. Ha/Wst.1/WA.{Mr Wallis}18.12.34. BENTLEY DYNAMOS. Replying to your LA.{L. A. Archer}7/T.15.12.34., as the Bentley is essentially a high speed car and one which would be used frequently in gear we did not expect trouble due to late cutting in. However as it appears we still have customers who do not use their gears in London traffic even with Bentley's we have at C's instigation put in hand dynamo armatures which will decrease the cutting in speed. The maximum output however for a given temperature rise will be penalised as it is impossible to have early cutting in with the dynamo driven at engine speed as on the Bentley without increasing the armature resistance. As you will no doubt realise we are continually experimenting on the lines of increasing the dynamo output for a given temperature rise without increasing the cutting in speed. The air cooled dynamo of course considerably helps us in this direction. Ha/Wst. | ||