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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).
Technical memorandum discussing the causes of high-speed wobbles, referencing Mr. Healey's paper on gyroscopic effects.

Identifier  ExFiles\Box 29\1\  Scan273
Date  16th September 1925
  
C O P Y.

R.{Sir Henry Royce}
SJ.
c. BJ.
c. Hs.{Lord Ernest Hives - Chair}
------

BY7/H.{Arthur M. Hanbury - Head Complaints} 16.9.25.
----------------

HIGH SPEED WOBBLES.
----------------

Although the above matter interested me,
I had never given it any really serious thought until
this evening. My attention had been called to the matter
by the damping proposal I have put forward and incidentally,
I also happened to receive a copy of bound volume of
I.A.E. proceedings containing Mr. Healey's paper in which
he ascribes most of the virulence of the disturbance to
gyroscopic effects, but a comparison of his theories with
the experimental data he based it on certainly does not
bear out his contention.

Up to the present it had appeared self-evident
that the gyroscopic forces induced by the road wheel
oscillations were the paramount factor, but the data
published by Mr.Healey to confirm his contentions seems
to indubitably destroy the latter.

Whilst one had, as a result of experiencing
a very serious series of wobbles on a car with balloon tyres,
been definitely inclined to accept the wobble as the origin
of the resultant combined effects, it is clear in diagnosing
the case this cannot be the case, as the wobble has not
apparent connection with the diagonal (criss cross)
vibration of the axle unless the gyroscopic theory by
accepted as proved. but since in Mr.Healey's paper the CONT'
  
  


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