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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).
The testing of a gear engagement system, noting issues and adjustments for production on chassis 18-EX.

Identifier  WestWitteringFiles\T\2January1929-June1929\  Scan258
Date  4th June 1929 guessed
  
-2- contd.

engagement when the engine fired, appeared to be
slightly prolonged, the result being a more prolonged
gear scream on dis-engagement.
As stated, we are of the opinion that we
have slightly overshot the mark, though against this it
should be said, that in later trials of the same system
on the same chassis, the effect did not appear to be
so marked. One such system has been approved by
Mr. Platford as passing quite satisfactorily, in the
first instance, for production.
We did not similarly observe results on the
3rd chassis, namely 18-EX, to be fitted with a similar
system, and which has now, we understand, been sent to you.
We hope, however, you will find this system similarly
satisfactory.
We have however, arranged for a spring of
intermediate rate (called Y), which will be subject to
trial. We believe that this intermediate spring will
give the best result.
Generally speaking we do appear to have
arrived at a mainly satisfactory arrangement.
We have very carefully gone into the matter
of the exact adjustment and gap limits of the automatic
switch, and given production instructions accordingly. It
is not impossible, that owing to the heavy duty of this switch,
the operation of the main copper contacts may not be

contd.
  
  


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