I was not recommending it, merely observing that if you are not making
manoevres but merely making small corrections to maintain stable flight a
fluid does know where up is, or at least was. The "was" is the nub of the
matter if you do start manoevreing. There was a large research effort way
back on suspended mass systems for attitude reference. They were not
pursued eventually against emerging gyro technology mainly because of the
computing required (analogue only available in those days) to correct for
the acceleration effects in the general case. It might be time for such
systems to be revisited now that we have relatively cheap, accurate, and
small, absolute angular encoders with digital readout along with vastly
improved microcomputing.
gemin (ex Ferranti Inertial Systems Division !)
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