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).
Results of compression tests on the Spectre Engine suspension rubber.
| Identifier | ExFiles\Box 93\1\ scan0185 | |
| Date | 1st October 1935 | |
| X322 To Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} from RHC.{R. H. Coverley - Production Engineer} RHC.{R. H. Coverley - Production Engineer}5/ETM1.10.35. SpectreCodename for Phantom III Engine Suspension Rubber In connection with the above we give below the results of compression tests carried out by W. Bell - FRONT RUBBER - F.87575 - LeC.4462 The rating of the above rubbers has been checked - see attached - but to date there has not been an engine available with which to ascertain the weight supported by each foot. The total weight of a SpectreCodename for Phantom III Engine - S4 unit - was stated to be 856 lbs. therefore assuming the weight to be evenly distributed, the compression of the rubber will be .043", i.e. two all metal dummies of F.87575/6, each 1.957" in length will be required for lining up purposes. RHC.{R. H. Coverley - Production Engineer} | ||