[Brophmeister]

My dad parachutes out of a C47, his lowest jump was 600ft, he survived perfectly unharmed.He did another jump out of a cessna at 600ft too, Again he survived unharmed. So realy you should be able to bail out at about 700ft, because the airforce parachutes are smaller and there for don't slow you down as much

Don't forget that your dad's vertical speed is ZERO when he jumps, he acccelerates under the force of gravity and THEN his chute opens. Bailing out of a falling plane is different, you are probably well past your terminal velocity when you bail.