I did some calculation.
Starting at 6000 feet/2000 meter, the time in free fall to ground is 20,2 sec. This aircraft took about 18 sec from 6000 feet to ground. This means the G throughout the dive, from start to end, would have to be close to zero or slightly negative.
This seems to imply that the elevator/h.stabilizer must have been at average at approximately zero degrees angle of attack thus producing zero force.
I do wonder, if the jack screw for the stabilizer breaks loose, in which position will the aerodynamic forces put the stabilizer into? Would it "free float" into zero degrees AoA?