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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).
Query from Motor Sport magazine regarding conflicting data on gearbox and final drive ratios, and the brake servo application.

Identifier  ExFiles\Box 160\5\  scan0104
Date  1st January 1941 guessed
  
if you would kindly clear up
one point. "The Autocar" gives the
overdrive top as an indirect ratio, and I
certainly thought it made just a very slight
whine. However, in the gearbox
print you forwarded to me, the box-ratios are
quoted as 1.0 to 1 for overdrive and 0.7 to 1 for
normal top. As the axle casing suggests the
3.64 to 1 final drive, surely the overdrive is
direct, as is top gear normally, and ordinary
top indirect, the 4.3 ratio on the latter being
obtained by the 3.6 axle, plus the .7 reduction in
the box = 4.3 to 1? How, then, Litchfield's state-
ment and the just audible whine?
Could you also confirm, please, that the Girling
Brakes have the R-R.{Sir Henry Royce} servo-motor application, as I
cannot see the drive for the latter on the blueprint.
Thanking you, and with the Compliments
of the Season. Yours sincerely,
W. Boddy.
Act. Ed.{J. L. Edwards} MOTOR SPORT.
  
  


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