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 results from bearing tests on an engine test rig for center main bearings.
| Identifier | ExFiles\Box 173\2\ img243 | |
| Date | 27th February 1934 | |
| 30 February 27, 1934 Summary of Results of Bearing Tests on Rolls Royce Engine Test Rig Center Main Bearings. Test No. 1 2 3 4 5 6 7 Make brg. Allison Rolls Royce A.E.C. A.E.C. A.E.C. A.E.C. A.E.C. Material 70-30 70-30 70-30 70-30 60-40 70-30 70-30 Lubrication Groove Groove Groove 8 Holes Groove Groove Groove Time at max. R.P.M. 20 min. 3' 40' 20' 40' 40' 20' Max R.P.M.* 3500 3250 3500 3500 3500 3500 4250 Include * diving test No No Yes No Yes Yes No Bearing failure No Yes No No No No No Av. oil inlet°C 93 92 91 91 90.5 90 89 Av.oil outlet°C 93 92 101 101 99.2 98 103 Max. brg. temp. °C 132 200 110 153 152 135 156 Av. brg. temp. °C 120 163 108 137 116 118 134 Oil Press.#/sq." 70 38 78 70 70 71 70 Av. torque load, lbs. 17 24 17 18.2 16 16 22.5 Max. torque load, lbs. 25 85 27 22 32 28 32 Av. H.P. 19.8 26.0 19.8 21.2 18.7 18.7 31.8 Av. clearance before, inch. .004 .0052 .0035 .0043 .0046 See #6 See #6 Av. clearance after, inch. .0051 -- .0045 .0045 .0058 See #7 .0069 Av. wear, in. .0011 -- .0010 .0002 .0012 See #7 .0024 * Diving tests consist of 20 periods of 30 seconds at 3500 R.P.M. followed by 1 min. periods at 2230 R.P.M. (Note) Tests #6 and 7 were run on the same center bearing without inspection between tests. | ||