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).
Summary of test results for fabric and hermetic couplings.
| Identifier | ExFiles\Box 5\5\ 05-page42 | |
| Date | 30th September 1931 | |
| X512. FABRIC COUPLING TESTS. SUMMARY OF HERMETIC COUPLINGS. These couplings had no distinguishing marks, we therefore paired them off & the best of our ability. FLYWHEEL R.P.M. 285. INERTIA 130% STROKE 6° | Coupling Index No. | Date Comm. | Total Time Run | Total Reversals | Average R.P.M. | Remarks | |---|---|---|---|---|---| | A.1 | 1.9.31 | 5.30 | 182,820 | 276 | Finished | | A.2 | 5.9.31 | 3.1 | 101,320 | 281 | Finished | | B.1 | 2.9.31 | 6.5 | 205,760 | 282 | Finished | | B.2 | 7.9.31 | 61.0 | 2,085,500 | 285 | OK. Time Limit * | | C.1 | 4.9.31 | 1.29 | 50,050 | 282 | Finished | | C.2 | 17.9.31 | 56.16 | 1,890,450 | 280 | Finished - one holding stud broken. | | D.1 | 4.9.31 | 4.13 | 142,020 | 281 | Finished | | D.2 | 22.9.31 | 3.55 | 132,140 | 281 | Finished | * To ensure that this was not a fluke, this fabric was refitted and subjected to a further 20 hrs running after completing the above tests. At the end of this period it was still going strong and since an examination of the construction of this type may provide useful information the test was not continued. It is quite probable that B.2 & C.2 form a pair since B & C types were very difficult to separate; A & D types were quite distinctive. | ||