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).
Technical memo discussing improvements for aero engines, including bearings, oil circulation, and weight reduction.
| Identifier | ExFiles\Box 114\2\ scan0077 | |
| Date | 18th October 1934 guessed | |
| -5- On the aero. engines we have not found any improvement in adopting wider bearings in conjunction with lead-bronze, and in the Curtiss D-12, when they wanted more bearing area and a stronger shaft they increased the diameters. I suggest that we provide for greatly increased oil circulation and for higher oil pressures on this engine with the lead-bronze bearings. I suggest, also, that we should take steps to improve the oil baffling in the sump, so that the trouble of oil pressure failure after braking is no worse on this engine as it is already serious on the six-cylinders. I think we might save weight by omitting the aluminium panel between the cylinder liners where there is no main bearing, e.g. between cylinders one and two. The crankcase being unit construction is very much stiffer and the loads on it are very much reduced due to the larger balance weights. Crankshaft Period. The top period ( 4 per rev.vibration) will be at approximately 2600 R.P.M. on this car. The estimated crank stiffness is 70,400 lbs.ft./radian. E/TSN. | ||