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).
Clarifying technical terms and measurements for springs intended for Australia.
| Identifier | WestWitteringFiles\Q\April1927-June1927\ 78 | |
| Date | 13th May 1927 | |
| TO HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} ORIGINAL DA{Bernard Day - Chassis Design}1/M13.5.27. SPRINGS FOR AUSTRALIA, ETC. X.8410 X.8990 We thank you for your HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}1/LG10527. We will go into the points you raise and send you some information in the course of a few days, but in the meanwhile as there seem one or two points which are not quite clear to us, we shall be glad if you would send us some further information if necessary. (1) You speak of "normal" buffer clearance, and we presume this means buffer clearance with the spring in the normal position. On F.9817 the normal load is defined as that which exists with a .5 negative camber, or alternatively, with 3" initial deflection. On F.9927 the normal load is defined as that with .5 negative camber in the spring, but the buffer clearance is given as 6.1 under normal load, whereas in para. 'A' you speak of the normal buffer clearance as being 5.325 even with 15% stronger springs. (2) In both paras. A.{Mr Adams} & B. you say "the static load to bring the axle to the buffers will be approximately so much greater than with a standard spring". Do you not mean in each case "the increase of load to bring the axle to the buffers"? It seemed to us evident, taking for instance para. A.{Mr Adams}, that the static load to bring the axle to the buffers will be 15% only greater, since the springs are 15% stronger. The reason for raising these points is that we think there should be a definition of the various terms used, otherwise it is very difficult to describe these things exactly in language that is easily understood. DA.{Bernard Day - Chassis Design} | ||