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 design modification of the Goshawk II front springs to a length of 36 inches.
| Identifier | ExFiles\Box 49\3\ Scan019 | |
| Date | 24th January 1921 | |
| To R from DA. {Bernard Day - Chassis Design} Copy to BN. {W.O. Bentley / Mr Barrington} [Struck through] Copy to EFC. {E. Fowler Clarke - Electrical Engineer} X.4261 DA {Bernard Day - Chassis Design} 14/CB24-1-21. X.4261 "GOSHAWK II" - FRONT & REAR SPRINGS. We have received your telegram saying that you wish the front spring to be 36" long, and are proceeding to modify the work we had done so as to make them this length. We have been trying to work out the springs, taking each individual plate so as to know where we were out the spring, but we have found that it is such a long process that we shall not get it done in time, so we have adopted the simpler method of assuming the springs to be beam loaded at the centre and supported at the ends, and not two cantilevers. We have also assumed the average thickness and have kept the average stress within 100,000. We have finished our drawings, but in view of your telegram we are holding them back until we have got the 36" spring finished. We found that the front springs required a great many plates in order to keep the stress within the limits, also that it was necessary to keep the top plate practically flat in the free position, so that the increase in length to 36" will help us in that respect. DA. {Bernard Day - Chassis Design} [STAMP] RECEIVED EFC {E. Fowler Clarke - Electrical Engineer} JAN 25 1922 [/STAMP] | ||