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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).
Bentley engine gears, comparing unhardened gears against 45° helix angle gears.

Identifier  ExFiles\Box 136\5\  scan0326
Date  1st April 1938
  
To. By & Rm.{William Robotham - Chief Engineer}..From RHC{R. H. Coverley - Production Engineer}/SB.{Mr Bull/Mr Bannister} 1152.

RHC{R. H. Coverley - Production Engineer}/SE.1/MC.1.4.38.

Handwritten:
By.{R.W. Bailey - Chief Engineer} Unhardened gears. O.K. on 15000 miles.
[Initials] Rm{William Robotham - Chief Engineer}

BENTLEY ENGINE GEARS

With reference to By.7/G/29.3.38., we would state that the 45° helix angle timing gears with large pitch teeth provide no reduction in chassis cost, gear cutting times being exactly as at present.

The troubles encountered with existing design gears will be considerably reduced when the unhardened dynamo and idler pinions are standardised on the 1st Bentley in 'M' series, and we do not, therefore, consider it advisable to embark upon the 45° gears, particularly since the existing 5 gear train will probably become obsolete at the end of 'M' series.

RHC{R. H. Coverley - Production Engineer}/S.Bannister.

Handwritten:
We are not instructing 45° gears. in view of this
[Signature] 5/4/38
  
  


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