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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).
Maximum stiffness and buffer options for chassis springs destined for Australia.

Identifier  ExFiles\Box 43\2\  Scan216
Date  24th June 1927
  
To EY. from R.{Sir Henry Royce}
c. to BJ. Hs.{Lord Ernest Hives - Chair}

X3900

R4/M24.6.27.

RE. CHASSIS SPRINGS FOR AUSTRALIA.
X.8990
X.8410
X.3900

In reply to your EY11/H22.6.27., I consider
that 20% stiffer springs are the maximum stiffness that we
should fit to any car. If these were our standard stock
of springs, their normal position would give an increased
camber, and therefore increased rubber buffer clearance. The
car would then ride with its maximum load about the same
position as the normal load.

We can choose between using the normal buffers,
and risking the spring breakage, or using increased depth
of rubber buffer so as to make the shock on striking the
buffer less felt in the car. This latter arrangement is
preferable and would save the springs from breaking.

Every care should be taken that the springs
sent out are so graded in the length of the plate that the
stresses throughout the length of the leaves are the same.
OY. says this is not the case with the ordinary Sheffield
made springs, and that they have corrected it in those they
have manufactured themselves at Springfield.

R.{Sir Henry Royce}
  
  


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