The failure of pressure and gravity fed Eagle plain bearings during testing.
| Identifier | ExFiles\Box 42\1\ Scan120 | |
| Date | 26th November 1925 | |
| To R: from Hs. {Lord Ernest Hives - Chair} c. to CJ. BJ. c. to E. {Mr Elliott - Chief Engineer} DA. {Bernard Day - Chassis Design} c. to AJS. Wor. {Arthur Wormald - General Works Manager} /3829 Hs {Lord Ernest Hives - Chair} 2/LG26.11.25. RE. EAGLE(Aero Engine) XVI. +4114 With reference to the tests on Eagle(Aero Engine) Plain Bearings we have now produced failures on both pressure oil fed and gravity oil fed bearings. In the case of the gravity fed bearings we propose to abandon any further tests on these as results prove that at high speed the oil feed is insufficient. With regard to the pressure fed bearing. The bearing which has failed was reported in our first report (Hs {Lord Ernest Hives - Chair} /Rn {Mr Robinson} /LG10.11.25) to have run 41 hrs. This bearing has run a further 16 hrs. making a total of 57 hrs. running and has now failed under load of 1500 lbs. at 3,700 r.p.m. This was a floating bearing with .0004 clearance between shaft and bearing and .0009 clearance between outer dia. and trunnion. TABLE DATA: R.P.M. | Load lbs. | Time run. hrs. mins. | Temp. | Oil pressure. 2220 | 297 | 2 14 | 71°C | 10-15 lbs. 2220 | 1018 | 6 43 | 80°C | " " 2220 | 1502 | 4 50 | 79°C | " " 3500 | 1502 | 20 | 80°C | " " 3700 | 1502 | 1 55 | 85°C | At this stage the brg. failed, temp. rising to 140°C 3900 Total time run - 16 hrs. Prices 'C' oil used. It will be observed on the last test that speed contd :- | ||
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).