The turntable chassis should be restored. Perhaps the weight savings of lube oil, (2-types needed in normal current helicopter technology) on each of the four motors could also give weight space for electromagnetic bearings with a thrust bearing combination around the outer ring on the rotorblades to control vibration and free-wheel free of drag, and easy start.
Another concern in the art with regard to journal & thrust combined bearing lubrication is that which is created by centrifugal force produced by the rotating collar and tending to cause the sprayed or injected oil to be thrown radially outwardly and thus be at least partly ineffective in lubricating.

An internal combustion engine comprising mainly of crankcase, cylinder head, piston, connecting rod, and crankshaft, said crankcase is provided with at least two main bearing caps wherein thrust washers are provided only on both sides of at least one main bearing cap corresponding to the thrust main bearing wall.
2. The lubrication system as claimed in claim 1, wherein said oil outlet is of a cross-sectional size greater than that of the remainder of said nozzle passageway, and said oil outlet is an opening of a 180 degree angle on a plane transverse to the longitudinal axis of said nozzle.
Through the prudent use of temperature and vibration monitoring equipment, routine oil analyses, lubrication system evaluations and machine operational performance reviews, bearing distress may be identified and evaluated before catastrophic failure occurs.

The test shall include checks for impacts in the gear set, leak of lubrication through the bearings, increase of the temperature of the bearing assemblies (it shall not exceed 15 to 20°), vibration of the drive gear bearing, pulleys and motor (no more than 0.1 mm).
Abstract: Through analyzing the design methods of liquid sliding bearing and the matching spindle of common roller grinding head, the design methods and ideas of liquid sliding bearing and the matching spindle of high-speed roller grinding head are put forward, and on these bases, a kind of liquid sliding bearing and the matching spindle of high-speed roller grinding head are designed.
Roller Thrust - The roller thrust bearings are a lot like ball thrust. When moving lighter loads ball bearings do not have as much friction as roller bearings, and can support radial and axel loads. These bearings consist of a cage made from a steel plate, which is precisely press formed and surface-hardened, and needle rollers with a diameter variation within 2μm.

Roller Bearings - Roller bearings are made to carry heavy loads. Abstract: Foil bearing that has a soft surface is a kind of air bearing. This can force the converter against the flex plate more so than normal and cause wear to the engine thrust bearing. Thrust pads are available with offset pivots to maximise the oil film thickness and reduce bearing temperatures.
In operation, the oil coming through the passageway 22 is under the usual oil pressure which can be created in the usual manner and it follows the path of the arrow designated B in FIG. Thrust bearings can lose their lubrication over time as they wear. The thrust bearing is most often placed at the second main bearing from the rear of the engine.