John
I waa about to address that one as well as high G loads on recovery. It
requires the aircraft to be stalled for the spin, and if its stalled,
the airspeed isn't building! If there is excessive G loading at time of
recovery, it would suggest someone isn't doing a smooth recovery and is
applying way too much control pressures which could result in a
secondary and an unanticipated stall/spin going in a unknown direction?
Been my experience in thousands of spins that the airspeed is well
within the norms and without excessive G loading.
As for the gyros, I haven't seen them deteriorate below IFR standards
after a lot of spins. Once upon a time, back 30-40 years ago that was
not the case.
Best Regards
Ol S&B