Having exited an aircraft at 120 mph I would not care to do it again. It was like being thrown into a brick wall. I think it would be hard to exit at 175 or even 150 and maintain consciousness.
One detective at the time said that D.B. jumping from that center exit door “would have gone ass over teakettle the instant he hit the windstream and probably plummeted to earth wound up like a ball in his chute”.