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).
Testing and modification proposals for EAC & Goshawk front shock absorbers.
| Identifier | ExFiles\Box 68\2\ scan0098 | |
| Date | 1st October 1925 | |
| X8520 To Hs{Lord Ernest Hives - Chair} from RHC.{R. H. Coverley - Production Engineer} RHC{R. H. Coverley - Production Engineer}1/BE. 1.10.25. RE EAC & GOSHAWK FRONT SHOCK ABSORBERS With reference to the above it should be an easy matter to obtain the increased load required on Front Shock Absorbers providing the Springs are in accordance with drawing and properly tempered. Some of the Springs obtained from Stock were .200 under free length dimension. On EAC Shock Absorbers it was found necessary to pack up the Spring F.1456 by using a .062 Washer which gave a load of 92 lbs which was obtained with Spring not quite choc-a-bloc. On Goshawk Shock Absorbers a .250 thick Washer was used for packing up Spring F.51491 which gave a load of 78 lbs with the Spring not quite choc-a-bloc. When dismantling after test it was found that Springs in eachcase had taken a permanent set, so to meet immediate needs we would suggest that Springs are selected and Washers of the dimensions given, used for existing Shock Absorbers. Meanwhile we have taken up this matter with the O.O. and ordered supplies of Springs which will fulfil drawing requirements and which must be properly tempered. We have also instructed that no further Springs should be issued from Stock until they have been inspected and passed as being serviceable. When the new Springs are available we propose carrying out further tests to find out whether the packing washer on the EAC Shock Absorber can be deleted, but in the case of the Goshawk it will be necessary to use a packing washer even when the correct Springs are available because the square guide on the centre bolt will be in the wrong position when Springs are further compressed. For future production it will be advisable to modify the centre bolt by altering position of the square guide, also the retaining nut should be threaded the whole length and not recessed to facilitate assembly. Both Shock Absorbers were assembled under standard conditions for above tests. RHC.{R. H. Coverley - Production Engineer} | ||