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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).
Test results for steering column movement measured at the thrust race on a bumping rig.

Identifier  ExFiles\Box 17\3\  Scan224
Date  17th April 1935 guessed
  
COLUMN MOVEMENT TESTS. BUMPING RIG - MOVEMENT
MEASURED AT COLUMN THRUST RACE. 2" CAMS. 108
R.P.M. BUMPING FRONT WHEELS.

CONDITION OF CHASSIS.
COLUMN MOVEMENT.
Bumper running. Static test horizontal.
Vertical. Horizontal.

No front axle dampers fitted.
(1)
Complete dash and column support as shewn in sketch. .200" .460"
As (1) (2)
Steering wheel removed. .150" .450" .230
As (2) (3)
Side 'B' of triangular column support removed. .140" .400" .060
As (1) (4)
But dashboard supports 'A' removed. .320" .400"
As (4), but with radiator tie rod disconnected. .230" .400"

Movement measured here.
Triangular column support in std. position.
  
  


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