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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).
Investigation of a higher ratio gear for the Peregrine casing rear axle.

Identifier  ExFiles\Box 179b\1\  img133
Date  1st October 1932
  
M.{Mr Moon / Mr Moore} FROM D.A.
C. to SC. HSR. HS.{Lord Ernest Hives - Chair} H
Rm{William Robotham - Chief Engineer}
DA{Bernard Day - Chassis Design}1/429.10.32.
X4553.
E.{Mr Elliott - Chief Engineer} 3. REAR AXLE.

It will be necessary to have a gear still
higher than the 4.1 to 1 we have already given you, and we have
investigated the possibility of getting such a gear into the
Peregrine casing. If we can have a pinion angle of about 35°
it looks as though we could do so without materially altering
the existing dimensions.

We send herewith a.{Mr Adams} sch. 3577. showing a
11/41 gear, 35° pinion angle, which gives approximately 90 MPH.
at 4000 RPM. of the engine.

DA.{Bernard Day - Chassis Design}
  
  


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