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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).
Static stiffness test results comparing a standard 40/50 chassis with a Continental Phantom chassis.

Identifier  ExFiles\Box 17\3\  Scan193
Date  9th March 1928
  
Hs{Lord Ernest Hives - Chair}/Tsn/LG9.3.28.

CONTINENTAL PHANTOM FRAME - STIFFNESS TESTS ETC:

A series of static tests have been done on
complete chassis in order to settle two points :-

(1) To determine the amount of frame deflection
due to road shock perceptible at the steering wheel (a) with
a standard 40/50 chassis (50-PH) and (b) with rubber engine
feet and cast dash (17-EX Continental chassis)

(2) The comparative torsional stiffnesses of the
frames, one standard and the other with rubber engine feet.

(1) Steering column movement.

The front springs were blocked so as to remain
rigid. The front wheels were then jacked up alternately a
distance of 6", and the movement of the top of the steering
column in 3 dimensions relative to the centre of the 3rd. cross
member was measured with dial indicators. The movements were
as follows :-

Wheel Raised. Direction of Motion. 17-EX Continental Phantom. 50 PH Standard Chassis.

O.S. front. R.{Sir Henry Royce} to L. .110 .100
F.{Mr Friese} to R.{Sir Henry Royce} .050 .060
Downwards. .012 .040

N.S. front. L. to R.{Sir Henry Royce} .170 .100
R.{Sir Henry Royce} to F.{Mr Friese} .056 .050
Upwards. .014 .043

It cannot be said therefore that frame distorsion
due to road irregularities will be directly perceptible at the
contd :-
  
  


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