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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 report on vehicle suspension performance, analyzing the effects of low-rating springs and various damping configurations.

Identifier  ExFiles\Box 18\3\  Scan187
Date  11th November 1930 guessed
  
-3-

all round, soft at low speeds; no pitching at the
usual place, 35 to 45 m.p.h. the high speed riding was
very good on all varieties of road in the district.

Our previous experience with low rating springs
has been that they tend to spoil the control of the
car at high speeds, producing swaying, rolling and reducing
the selectivity of the steering. On this car, however,
after considerable testing, none of these faults were
at all prominent, the car being very stable under all
conditions, the steering very good.

Before delivering the car, the Hartfords were
removed at Sg{Arthur F. Sidgreaves - MD}'s request. The effect of removing the
front friction damping is to slightly increase pitching.

The buffer clearances with four passengers were

Front N.S. 2.2" O.S. 1.8"
Rear N.S. 3.75" O.S. 3.75"

The spring alteration has lowered the front of the car
by approx. .6" and raised the rear .5"

The conclusions arrived at from these tests
are that

(1) Low rating front springs improve pitching
in combination with

(2) High hydraulic damping with drilled valves and

(3) 15 lbs friction damping.
  
  


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