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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).
Page showing steering angle curves for a Wraith without a roll rod under various conditions.

Identifier  ExFiles\Box 9\7\  07-page100
Date  17th December 1937
  
-4-

The Wraith curve shown in Fig. 1 and Olley's curves shown in Fig.2 indicate exactly the same trouble and cause.

This was proved by taking a further set of steering angle curves of the Wraith with no roll rod.

These are shown in Fig.3

(1) with tyre pressures 30 lbs/sq.in. rear
25 lbs/sq.in. front.

(2) with 30 lbs/sq.in. front and rear.

(3) As (2) but with 600 lbs. ballast in rear of car.

FIG 3

[Graph Text]
Title: STEERING ANGLE CURVES FOR WRAITH WITHOUT ROLL ROD
Y-Axis: UNDERSTEER / OVERSTEER
X-Axis: SIDEWAYS G
Bottom Right Label: Fig. 3
  
  


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