Hi Stoll, great project.
When I started at flying school, we had some aerobatic lessons in a Bonanza 33. The problem with negatve G's was not a drop in oilpressure, but the fact that oil was collected at the bottom of the pistons causing all kind of unballance. Did you never have any of those problems?
But I agree, a pre-charged oil accumulator must work. Maybe you must have a look at the HYD pressure accumulators used for parking brakes on airliners.
Have a good one ;-0
Arno
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