July 17, 2010
Something for the glass-is-half-full crowd
There must be something in the air -- economic disaster, car bombs overseas, class warfare -- that has me scanning the internet for advice on how to survive parlous and perilous times.
Popular Mechanics offers this second-by-second guide (or is that foot-by-foot?) to surviving a 36 thousand-foot plunge after your airplane disintegrates. Remarkably, 31 people have survived such a plunge, without the benefit of a parachute.
In 1972, Serbian flight attendant Vesna Vulovic was traveling in a DC-9 over Czechoslovakia when it blew up. She fell 33,000 feet, wedged between her seat, a catering trolley, a section of aircraft and the body of another crew member, landing on—then sliding down—a snowy incline before coming to a stop, severely injured but alive.
Surviving a plunge surrounded by a semiprotective cocoon of debris is more common than surviving a pure free-fall, according to Hamilton’s statistics; 31 such confirmed or “plausible” incidents have occurred since the 1940s. Free-fallers constitute a much more exclusive club, with just 13 confirmed or plausible incidents, including perennial Ripley’s Believe It or Not superstar Alan Magee—blown from his B-17 on a 1943 mission over France. The New Jersey airman, more recently the subject of a MythBusters episode, fell 20,000 feet and crashed into a train station; he was subsequently captured by German troops, who were astonished at his survival.
The tone of the article is remarkably hopeful. Why not? What's the point of being a pessimist as you hurtle through the sky at terminal velocity, shrieking like a banshee?
You have a late night and an early flight. Not long after takeoff, you drift to sleep. Suddenly, you’re wide awake. There’s cold air rushing everywhere, and sound. Intense, horrible sound. Where am I?, you think. Where’s the plane?
You’re 6 miles up. You’re alone. You’re falling.
Things are bad. But now’s the time to focus on the good news. (Yes, it goes beyond surviving the destruction of your aircraft.) Although gravity is against you, another force is working in your favor: time. Believe it or not, you’re better off up here than if you’d slipped from the balcony of your high-rise hotel room after one too many drinks last night.
Or at least you will be. Oxygen is scarce at these heights. By now, hypoxia is starting to set in. You’ll be unconscious soon, and you’ll cannonball at least a mile before waking up again. When that happens, remember what you are about to read. The ground, after all, is your next destination.
Granted, the odds of surviving a 6-mile plummet are extra ordinarily slim, but at this point you’ve got nothing to lose by understanding your situation.
Whether you’re attached to crumpled fuselage or just plain falling, the concept you’ll be most interested in is terminal velocity. As gravity pulls you toward earth, you go faster. But like any moving object, you create drag—more as your speed increases. When downward force equals upward resistance, acceleration stops. You max out.
Depending on your size and weight, and factors such as air density, your speed at that moment will be about 120 mph—and you’ll get there after a surprisingly brief bit of falling: just 1500 feet, about the same height as Chicago’s Sears (now Willis) Tower. Equal speed means you hit the ground with equal force. The difference is the clock. Body meets Windy City sidewalk in 12 seconds. From an airplane’s cruising altitude, you’ll have almost enough time to read this entire article.
The author discusses the relative merits of a water landing (best to be avoided) and how best to "stick" the landing (head-first is not a good strategy).
Remind me to print this one out for my next flight.
Posted by Mike Lief at July 17, 2010 08:56 AM