Space Diving

Mentioned previously.

Sixty miles up, you sit in a chair on the open deck of a small rocket, admiring the stars above, the Earth far, far below. The vacuum beyond your visor is cold, but it would boil your blood if your pressure suit failed. You give your parachute straps a reassuring pat. It’s utterly silent. Just you and your fragile body, hovering alone above the Earth. “Space Diver One, you are go,” crackles a voice in your ear, and you undo your harness and stand up. There’s nothing for it now: You paid a lot of money for this.

You breathe deeply and leap, somersaulting into the void. The mother planet is gorgeous from up here. You barely perceive that it’s rushing up toward you, and your body relaxes. You streak into the atmosphere at 2,500 miles an hour, faster than anyone’s ever gone without a vehicle. The sky lightens, the stars disappear behind the blue, and a violent buffeting begins. You deploy your drogue chute for stability; an uncontrolled spin in this thin air would rip you apart. The thick lower atmosphere slows you to 120 mph—terminal velocity. After a thrilling seven-minute plummet, you pull your main chute at 3,000 feet, hands shaking, and glide in for landing. A mile away, your rocket retro-thrusts its way gently to the ground.

They are aiming higher: full orbital reentry

If all goes well, they’ll reach even higher. “Our ultimate goal,” Tumlinson says, “is to have individual human beings return from orbit alive.” That’s a drop from 150 miles—or more—involving increased heat and near-deadly Gs, essentially turning their divers into human meteorites.

Even that’s survivable, says NASA Jet Propulsion Laboratory engineer Robert Manning, who designs reentry systems for unmanned craft. Given the right protection—including thermal protection, oxygen, an aerodynamic heat shield and a control system—Manning says, a human being could, theoretically, fall to Earth from any height and survive. The question is whether Tumlinson and Clark can turn theory into fact, and whether anybody would be crazy enough to give their thrill ride a try.

Humans traveling at transonic speeds is possible

t is very likely, he thinks, that a suited human will survive the transonic shocks. His optimism is based in part on the second precedent he can name—one in which a person survived. In 1966 an SR-71 Blackbird broke up at 78,000 feet while traveling at Mach 3.18. The pilot, Bill Weaver, survived. He left the plane at three times the speed of sound but, because he was unconscious, he can’t describe any shock waves he might have experienced. He sustained no lasting damage.