Into the vortex
The powerful, sometimes dangerous phenomenon of wake turbulence. Plus, Web addresses on livery? Really?
The air flow from the wing of this agricultural plane is made visible by a technique that uses colored smoke rising from the ground. (Credit: Wikipedia/NASA) Not to dwell on the aesthetics/livery thing any more than I already have, but a quick observation: How tacky are the “AA.com” advertisements plastered on the winglets of American Airlines planes?
Winglets, if you’re unfamiliar, are those finlike projections at the tips of the wings, and certain carriers have taken to plastering logos or Web addresses on them — usually on the inside-facing portion, visible through the cabin windows. The space is too constricted to be used this way. Delta, among others, does it right, giving each winglet a simple coat of the same handsome blue used in the rest of its livery.
For that matter, all references to Web addresses ought to be banned from all parts of a carrier’s livery. Like somebody might not know that airlines have their own websites where people can check out flights and book tickets.
Of course, the only thing more unnecessary that a URL splattered across a winglet or fuselage are those cases where a carrier’s entire identity is oriented around the Internet. In Brazil, now, there’s something called WebJet. It’s a 737 operator based out of Rio, though with a name like that it may as well exist solely in cyberspace.
Or worse, remember Mexicana’s “Click” subsidiary? That’s right, Click. “I’m flying Click from Monterrey to LAX.” (Or you were flying Click, since last year’s unfortunate demise of Mexicana, which was one of the three oldest airlines in the world, took Click down with it.)
Best I can tell, the intent was to evoke the sound one makes while conveniently booking his or her ticket online. Logical, but still stupid.
Hungary’s Wizz Air reminds us of a sound also, though probably not the one the company has in mind.
Wizz Air. Like “underwear bomber,” we’re expected to say that without irony, with a straight face? What next?
And I’m curious: Is commercial aviation the only big industry that has, with certain exceptions, all but given up on presenting itself with dignity? Everything is so downmarket and cheap and gimmicky these days, from liveries and logos to staff uniforms to the very names of airlines themselves.
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All right, now that I’ve brought up winglets, I’d better do some tech talking about their purpose. Winglets have been discussed previously in this column, but it’s been a long time and if I don’t reexplain them I’m going to be deluged with letters. What are they for?
At a wing’s tip, the higher pressure beneath the wing meets the lower pressure above it, sending out a turbulent discharge of air. Winglets, as they’re affectionately called, help smooth this mixing, decreasing drag and, in turn, improving range and efficiency. You see them in different forms. Some are large and jaunty while others are just a tweak. With a “blended winglet,” as it’s known, the wing tapers almost seamlessly into an upturned fin, with no harsh angles. Newer planes like the 787, 747-8 and the soon-to-come Airbus A350 use a more integrated style, sometimes referred to as a “raked wingtip.”
Because planes have different aerodynamic fingerprints, winglets aren’t always necessary or cost-effective. For instance, the 747-400 and A340 have them, while the 777 does not, even though it too is a long-range widebody. Because the advantages of winglets weren’t recognized until fairly recently, older models were designed without them. For these planes — a list that includes the 737, 757 and 767 — they are available as an option or retrofit. An airline considers if the long-term fuel savings is worth the cost of installation (millions of dollars per plane usually). It depends on the flying. In Japan, Boeing has sold a number of 747s, used specifically on domestic routes, with winglets removed. There’s no real efficiency gain on such short-range pairings, and meanwhile the plane is lighter and easier to maintain.
Aesthetics are a personal thing. I find winglets attractive on some planes, like the A340, and awkward on others, like the 767.
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Another thing winglets do is dissipate the strength of the rotating vortices that spin from a wing’s tip. These vortices, trailing behind the aircraft like horizontal tornadoes, can be very powerful and sometimes dangerous to nearby planes. The full story on this phenomenon, also known as “wake turbulence,” including links to some amazing photos and an account of my own frightening run-in with a vortex, can be read here.
When humidity levels are high you can sometimes see the condensed inner cores of these vortices, writhing through the air like long gray snakes (people sometimes misunderstand this to be jettisoned fuel). But what’s even cooler is that you can sometimes hear them from the ground.
You need to be very close to a runway — preferably within a half-mile of the end. The strongest vortices are produced on takeoff, but ideally you want to be on the landing side, as the plane will be nearer (i.e., lower) at an equivalent position from the threshold. A calm day is ideal, as gusts will dissipate a vortex before it reaches the ground. About 30 seconds after the jet passes overhead you’ll begin to hear a whooshing, crackling and thundering. It’s a menacing sound unlike anything you’ve heard before.
As a general rule, bigger planes produce a bigger wake, but the plane to look for is a non-wingletted Boeing 757. (Many 757s have been retrofitted with vortex-reducing winglets, but many have not.) Due to an aerodynamic quirk that nobody fully understands, the medium-size 757 produces the most powerful wake of any airplane ever recorded.
See — or hear — for yourself in this footage captured a few weeks ago on my iPhone.
It was taken at the Belle Isle Marsh Reservation, a popular bird-watching spot about a half-mile north of runway 22R at Boston’s Logan International Airport. The plane is a straight-wing (no winglet) American Airlines 757. Excuse the atrocious video quality, but the sound is acceptable and that’s the important thing. You begin to hear the vortices at 0:45, and they continue pretty much to the end. Note the incredible gunshot-like noises at 0:58.
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Do you have questions for Salon’s aviation expert? Contact Patrick Smith through his website and look for answers in a future column.
Patrick Smith is an airline pilot. More Patrick Smith.
Behind the underwear bomb
The latest airplane terror plot wouldn't have been foiled without airport security -- but not the kind we all know
Travelers line up at a TSA checkpoint at Los Angeles International Airport.
(Credit: Reuters/Danny Moloshok) Another deadly plot taken down in the planning stages. This time, thanks to the work of a CIA double agent, officials were able to infiltrate a Yemen-based al-Qaida plot to destroy a U.S.-bound jetliner using a nearly undetectable underwear bomb.The moral of the story: Airport security works!Am I being facetious? Not necessarily. It depends on your definition of airport security.
In my mind, the key to keeping airplanes safe is, and always has been, stopping acts of sabotage while they are still in the planning stages. Here in the age of the TSA checkpoint, with its toothpaste confiscations and obsession with pointy objects, we tend not to think this way, preoccupied instead with a kind of airport Kabuki — the tedious, fanatical screening of passengers and their carry-ons. Real airport security takes place offstage, as it were. It is the job of the folks at the CIA and the FBI, working together with foreign authorities. And while TSA has an important role here too, we can do without the spectacle of airport guards rifling through innocent people’s bags in a pathological hunt for what are effectively harmless items.
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Letter from Mumbai
Could this long-winded carpet merchant really mistake me for a wealthy customer, ready to whip out my credit card?
(Credit: Patrick Smith) Flying from Europe to India, we pass overhead Odessa, Ukraine. Odessa, they say, is home to the most beautiful women in the world. Then across the Black Sea to Azerbaijan and the gorgeous barren landscapes of Georgia. Next comes the ink-dark Caspian, and then the long desolate outback of northwestern Iran. (The controllers down in Tehran are courteous and professional, their English impeccable — easier to understand than most Scottish controllers.)
From there it’s directly overhead the apocalypse of Karachi, followed by a turn southbound, out across the Arabian Sea toward Mumbai.
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Revere Beach reveries
It was my perfect beach: Sand, clean water to swim in, and situated right below the approach to Logan Airport
A smiley-face balloon floats over Revere Beach in Revere, Mass. (Credit: AP) Sometimes when I hear the whine of jet engines, I think of the beach.
I don’t expect that to make sense to you — unless, like me, your childhood was defined by an infatuation with jetliners and summers spent at a beach that sat directly below an approach course to a major airport.
That would be Revere Beach, in my case, just north of Boston, in the mid- to late 1970s.
Then as now, the city of Revere was a gritty, in many ways charmless place: rows of triple-deckers and block after block of ugly, two-story colonials garnished in gaudy wrought-iron. (Revere is a city so architecturally hopeless that it can never become gentrified or trendy in the way that other Boston suburbs have.) Irish and Italian families spoke in a tough, North Shore accent that had long ago forsaken the letter “R.” Shit-talking kids drove Camaros and Trans-Ams, the old-country cornuto horns glinting over their chest hair.
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Beware the “office” romance
Do pilots and flight attendants really stay in separate hotels on layover? Plus: Do pilots bring their own food?
(Credit: Xavier Marchant via Shutterstock) Why can’t commercial jets be fitted with an exclusive side entrance into the cockpit, making it impossible for a potential skyjacker to gain access?
I am asked this all the time. It presents a number of complications.
First, you can’t simply cut a hole into the side of a plane and add an extra door. Doing so would require a large-scale and extremely expensive structural redesign. And in most cockpits there simply isn’t room for such an addition.
Presumably, too, you’d need to add a lavatory to the cockpit. And what about rest facilities? Long-haul flights carry augmented crews that work in shifts, and the off-duty pilots require a suitable place to relax or sleep. You’d be doubling or tripling the size of the average cockpit, which in turn would take up space already used for galleys, storage and passenger seats.
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The things I carry
All those gadgets, chargers, adapters and cords are supposed to make my life easier. I'm not so sure
(Credit: Patrick Smith) The scourges of modern-day air travel.
I can think of a few: TSA, delayed flights, garbage in your seat pocket. Screaming kids and misdirected luggage. “CNN Airport News.”
Or, how about the blizzard of cardboard placards that hotel chains insist on littering their rooms with? I spend a quarter of my life in hotel rooms, and I resent having to spend the first five minutes of every stay gathering up an armful of this diabolical detritus and heaving it into a corner where it belongs. Attention, innkeepers: This is fundamentally bad business. One’s first moments in a hotel room should be relaxing. The room itself should impart a sense of welcome. It shouldn’t put you to work.
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