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).
Comparing drip feed and oil pressure fed bearings for the Eagle XVI engine.
| Identifier | ExFiles\Box 42\1\ Scan118 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 21. 12-6-25) J.H.U. EXPERIMENTAL REPORT. Expl. No. X3829 REF: Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}/LG101125. To AJS. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} EAGLE XVI - BEARINGS. X4114 X3829 With reference to the tests on Eagle plain bearings. We are taking comparative tests between the drip feed and the oil pressure fed bearings. The bearings under test have steel cores with whitemetalled lining on inside and outside, and judging by the results obtained at the moment, it would appear that the pressure fed bearing is the most promising. PRESSURE FED BEARING. R.P.M. | Load. | Time run. | Temp. | Oil pressure. 2220 | 1500 lbs. | 20 hrs. | 85°C | 15 lbs/sq.in. 3550 | 1500 lbs. | 21 hrs. | 85°C | 15 lbs/sq.in. This bearing is still in good condition and will be subjected to further tests. -------------------- DRIP FEED BEARING. The oil feed has a head of 12" and the jet passes 1.5 pints per hour. The first bearing failed after 2 1/2 hrs. running at 2220 r.p.m. with varying loads from 297 lbs. to 1018 lbs. The average temperature during this run was 96°C, then rose rapidly to 125°C. We therefore replaced the bearing by a new one which has, just at the moment run 10 hrs. at 2220 r.p.m. with 1500 lbs. load at a temperature from 90°C to 100°C. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||