Accumulator

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The travel air had accumulators, so I know what the basic function is, on that airplane. Also, you dive to 180 before un-accumulating the prop *SCARY*.
Anyway, I could have sworn that at one point in time or another, GMAs suggested that they were a waste of time, and only really contributed to leaking oil out the back of the airplane, and adding weight that wasn't needed.

BTW, this is on the rear engine, only, and there is no accumulator on the front engine, which seems odd. You'd think if they bothered to put accumulators on one engine, they'd put it on the other.