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).
Test results comparing an 'Oilite' bush with a standard bearing on a Phantom II engine starter motor.
| Identifier | ExFiles\Box 62\1\ scan0346 | |
| Date | 5th December 1935 | |
| Hs{Lord Ernest Hives - Chair}/Wst.7/MA.5.12.35. STARTER MOTOR ON PHANTOM II ENGINE IN TANK. We have now carried out tests on a motor fitted with an "Oilite" bush in the driving end bearing as requested in Ry/RD.1/W.1.7.35. Our conclusions were that the "Oilite" bush was considerably better than the existing pad lubricated bush. Results of tests. (1) Light test with "Oilite" bearing. Current at start of test 24.4 amp. at 6 volts. 3600 R.P.M. After 15 mins run, 22.6 amperes at 6 volts. 3770 R.P.M. The "Oilite" bearing was much cooler after the run than the commutator end bearing, the only increase in temperature being mainly due to the heating of the windings. (2) Light tests on same motor but with standard bearing. Start. Current 30.5 amperes at 6 volts, 2860 R.P.M. After 15 mins. run. Current 27.0 amperes at 6 volts, 3154 R.P.M. During this test it was necessary to oscillate the armature a number of times to prevent it from seizing. After the test the standard bearing was much hotter than any other part of the motor. (3) Load tests. "Oilite" bearing through a reduction gear of 15.66:1 Torque 8.16 lb ins, armature speed 828 R.P.M. After a run of 5 minutes under this condition the BHP = .688. | ||