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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).
Technical notes discussing suspension characteristics including understeer, propeller shaft movement, and rear spring shackle design.

Identifier  ExFiles\Box 161a\1\  scan0121
Date  10th January 1939
  
[Handwritten top middle]
mr

[Handwritten top right]
To MR HTM .S
To MR OAC .S
To MR CH .S
To MR SD .S
To MR WLV .S

[Typed text]
Cont'd.{John DeLooze - Company Secretary}

a.{Mr Adams} .550 ins. prop. shaft pumping on max. bump.
b. 4.7% understeer under full load.
c. Zero understeer with 2 up in front seat, assuming .875 in. deflection for the removal of the rear two passengers.

9. The front end of the rear spring, being under the frame, is virtually a fixed limitation. The height of the rear eye is controlled by quantities outlined in '8'. It is impossible to provide a tension shackle of reasonable length to approx. the constant periodicity with varying load without imperilling the ground clearance.
It was agreed to use a long compression shackle which will give equivalent results and provide an easier and - lighter construction.

10. Rm{William Robotham - Chief Engineer}/GB. will go ahead with projects of the front and rear spring fixings of the rear springs so that we can determine the shape of the frame side member.
  
  


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