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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).
Selection and modification of springs and shock absorbers for a left-hand drive chassis.

Identifier  ExFiles\Box 43\2\  Scan272
Date  24th January 1931
  
To Sg.{Arthur F. Sidgreaves - MD} From Hs.{Lord Ernest Hives - Chair}
c. to WoF.

Hs.{Lord Ernest Hives - Chair}1/MJ.24.1.31.

RE. SPRINGING FOR R.R.A.I.

Replying to Sg{Arthur F. Sidgreaves - MD}8/E20.1.31.

We have decided from all our knowledge so far that the most satisfactory springs to fit on to the left-hand chassis are 4¼" deflection front, and 10¼" deflection rear. These are similar springs to those which we now have on 25-EX. The same springs are also fitted to 18-EX. car at Le CanadelHenry Royce's French residence., and 58-GN.

Although we are satisfied as regards the type of road springs we are not satisfied yet as regards the setting of the shock absorbers.

We are rather interested in R's remarks which you quote in your memo and we heartily agree with them up to a point. The point is, that with the Delco shock absorbers you can control the car with soft springs at high speeds without spoiling the low speed riding. This was demonstrated to me in U.S.A. With our present shock absorbers we are frightened to give them more work to do because we know as soon as we do this our troubles as regards noise and wear will be rapidly increased, and they are giving us too much trouble even with the present loads.

We found that the Delco had copied our proportions so exactly that their piston will fit into our shock absorber without any modification.

We hope to have running next week a set of R.R. shock absorbers incorporating most of the desirable features of the Delco. When we have these fitted we shall be able to put up the loads if we desire to the same as the Delco.

In order to clear the first of the left-hand chassis we shall be able to within the next few days to give the loading at which the shock absorbers should be set, and they will have to go away with that, being the best we know of with the present material.

If the modified R.R. shock absorber turns out as we expect we shall recommend that we stop work on any of the present type and change over. The last list of quarterly complaints just circulated, is convincing enough to shew that we have got to make a move.

Hs.{Lord Ernest Hives - Chair}
  
  


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