Originally posted by Red Tail 444
R2800's would fry if inverted for two seconds, but not modeled in AH
that is wrong.
the R2800-8W used in the early corsair before the -4, the 2800-10W used in the Hellcat -3 and -5 series and the R2800-21, -59, and -63 used in the C and D series P47. The the R2800-18W and present in the -4 series of the Corsair and -6 series of the Hellcat will sustain loss of oil pressure if it remains inverted in a NEGATIVE G environment for more than 8 seconds, as it takes time for the sump to drain all of its oil, and the scavenger takes the oil from the sump. The engine will not CEASE operation at this point, because it simply does not lose it's oil cooling abilty, the oil, will continually be splashed in the case, but new, cooler oil will not enter the system from the tank as the tank sump will be dry. If left in this attitude (which depends HIGHLY on the specific situation), damage could be sustained, but is not guaranteed.
In Positive G maneuvers this is not a problem, as the oil system continues to function as though the engine is upright. In reality the only time this is going to pose a problem in flight are inverted maneuvers that exhibit negative G's for prolonged periods of time, and as the R-2800 Radial is a highly survivable engine, that is capable of returning an aircraft on residual spalsh oil even with cylinders shot away, Losing most of it's oil to begin with...
