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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).
Modifications and vibration tests on car 93-NK, focusing on engine couplings.

Identifier  ExFiles\Box 69\2\  scan0226
Date  26th November 1924
  
To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}
c. to CJ. BJ.
c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer}
c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer}
c. to Wor.{Arthur Wormald - General Works Manager}

X8770
S E C R E T.
Hs{Lord Ernest Hives - Chair}5/LG26.11.24.

E.A.C. 93-NK. 18430

We propose bringing 93-NK car to WW. - arriving
on Tuesday morning the 2nd. Dec.

The car is now fitted with the 40/50 HP. starter
motor, 40/50 type front silencer, block type engine coupling,
and improved controls.

After we had made these changes, the car was defin-
itely less smooth. We have since tried several tests compar-
ing the solid block type coupling with the fabric coupling and
we are convinced that the fabric coupling makes a much smoother
car and gets rid of vibrations which can be felt when both
driving forward and on retard. We cannot use the fabric
coupling with the standard 40/50 starter arrangement. It may
be possible to alter the 40/50 starter gear, but still retain
the same scheme so that the fabric coupling could be used.

We may also find that with alteration to the align-
ment of the engine and gearbox, we might reduce the roughness
with the solid coupling. At present we make certain that the
two are correctly in line with the car stationary. It is
possible when the drive is taken, this alters.

As regards the vibrations on the steering column and
wheel which occur at 10 m.p.h. approximately. We find that a
similar period occurs on the standard 40/50 cars and the steer-
ings vibrate in a similar manner at the same speeds.

contd :-
  
  


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