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).
Thrust tests for a new No. 216 bearing intended to replace the existing thrust bearing on the Condor engine.
| Identifier | ExFiles\Box 42\1\ Scan134 | |
| Date | 26th January 1926 | |
| To Hs.{Lord Ernest Hives - Chair} from RHC.{R. H. Coverley - Production Engineer} c. to RG.{Mr Rowledge} C O P Y. RHC{R. H. Coverley - Production Engineer}3/BE26.1.26. RE. THRUST ON NEW DEPARTURE NO. 216 BEARING TO REPLACE THRUST BEARING NOW USED ON CONDOR ENGINE. We have carried out thrust tests on New Departure No. 216 bearing which has two rows of .562 dia. balls - 18 per row. The first series of tests were similar to the tests applied to Condor thrust sch. DES. 247. The bearing stood up so well that it was decided to give it two further tests of 10 hrs. duration in each direction. The bearing at the completion of these tests was examined - the condition being excellent. The results are as follows :- Wear in forward direction .001 " " reverse " .002 FORWARD TESTS. INITIAL FLOAT .0015. Load on lever, lbs. | Thrust load, lbs. | Speed of rig. (r.p.m.) | Time run hrs. | Max. temp. of oil °C | Increase in float 640 | 3,840 | 2250 | 1 | 80 | .0005 740 | 4,440 | 2250 | 1 | 62 | .001 840 | 5,040 | 2250 | 1 | 61 | .001 Time run - 3 hrs. REVERSE TESTS. INITIAL FLOAT .002 640 | 3,840 | 2250 | 1 | 83 | Nil 740 | 4,440 | 2250 | 1 | 71 | Nil. 840 | 5,040 | 2250 | 1 | 65 | Nil. Time run - 3 hrs. Tests of 10 hrs. duration in each direction. FORWARD TEST. (Total increase in float .001) 740 | 4,440 | 2250 | 10 | 74 | .001 REVERSE TEST. (Total increase in float .002) 740 | 4,440 | 2250 | 10 | 79 | .002. Total hrs. run - 26. contd :- | ||