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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).
Diagrams and calculations for the EAC-1 steering system, including centre point steering and pivot backward lean.

Identifier  ExFiles\Box 160\2\  scan0032
Date  8th January 1924
  
X4578
DETAILS OF EAC-1 STEERING. X3441
X9940 X4578
Effective tyre dia. to give
true centre point steering =
35.7".
Actual effective tyre dia. in
practice taken as 33".
Deviation in centre point
due to this = .228".
Torque tending to deflect
the steering when one wheel
locked on a road, - load on
front axle 22 cwts., co-effic-
ient of friction .6" =
(740 X .228)/12 lbs.ft. = 14.1 lbs.ft.
PIVOT BACKWARD LEAN = 1° to VERTICAL or 3/16" on Standar Springs
IN PIVOT LENGTH
Diagram annotations: 3.147, 1/2°, .228", 10°
  
  


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