[sarex] THE WORLD'S GREATEST PIGGYBACK RIDE
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Sun Jul 1 03:52:05 PDT 2007
SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468
The World's Greatest Piggyback Ride
Imagine flying from California to Florida with nowhere to sit, no
air conditioning, no place to store your bags -- not even a
The Shuttle Carrier Aircraft touches down at Kennedy Space Center with
Shuttle orbiter DiscoveryImage to left: Space Shuttle Discovery, atop
the Shuttle Carrier Aircraft (SCA), touches down at NASA Kennedy Space
Center's Shuttle Landing Facility on Aug. 21, 2005 after a ferry flight
from Edwards Air Force Base in California. Image credit: NASA/KSC
NASA keeps two 747s, known as the Shuttle Carrier Aircraft (SCA), set up
this way on purpose. The downstairs passenger area of these jetliners
are kept as hollow inside as possible in order to carry a special cargo:
a Space Shuttle orbiter.
One of these specially-modified SCAs brought the orbiter Discovery home
to Kennedy Space Center in Florida after completing the historic Return
to Flight mission. The SCA ferried the orbiter from Edwards Air Force
Base in California, where it landed Aug. 9.
Ferry flights are few and far between these days, but don't let the
light work schedule fool you: These aircraft have to work twice as hard
as a normal 747 to get the job done.
"It's brute force that keeps us flying," explains Larry LaRose, a flight
engineer on the SCA. "When we're carrying an orbiter, we have to use
twice the power and a lot more fuel to maintain flight."
The passenger area has been stripped of many creature comforts, such as
galleys, carpeting and even part of the inside temperature ductwork --
all for the sake of reducing weight. But the planes still weigh more
than 250,000 pounds, and the drag created by the shape and weight of the
orbiter -- 176,000 pounds or more, depending on any onboard payload --
negates the small amount of lift it adds.
The downstairs portion of the 747, stripped of seating and other
passener equipmentDuring a normal flight, the SCA might use 20,000
pounds of fuel an hour; with an orbiter on its back, that number doubles.
Image to right: The hollowed-out downstairs portion of the Shuttle
Carrier Aircraft used to hold passenger seating, galleys, luggage
compartments and more. It has been stripped of creature comforts to
reduce the plane's weight.
NASA/KSC image courtesy of Lynda Warnock
The piggyback arrangement might look cumbersome, but how does it fly
compared to a normal 747?
"It handles remarkably the same," says SCA pilot Gordon Fullerton. As
chief pilot at NASA's Dryden Flight Research Center, his daily job
involves flying jets for high-performance aircraft research. But
Fullerton's experience with the orbiter and SCA dates back nearly three
decades. In addition to being a Space Shuttle commander and pilot, he
was one of four NASA astronauts to land the Enterprise during the Space
Shuttle Approach and Landing Test program in 1977.
"It's obvious [the orbiter] is up there, because there's a constant
rumble that you can feel because of the wake of the orbiter hitting the
vertical stabilizer of the 747," Fullerton says of ferry flights. But
other than long takeoff rolls and the need for some extra care in steep
turns, "it's pretty much the same."
Flight Engineer Larry LaRose inside the SCA cockpitImage to left: Inside
the cramped cockpit of the Shuttle Carrier Aircraft, Flight Engineer
Larry LaRose sets up the pilot's seat for departure from Kennedy.
NASA/KSC image courtesy of Lynda Warnock
A small team of six specially-trained pilots and four flight engineers
has the critical task of making sure this precious cargo has a safe trip
from alternate landing sites.
Those who serve on SCA crews are former military aviators who are
qualified to fly several types of aircraft, such as the Shuttle Training
Aircraft, Super Guppy, zero-gravity aircraft and T-38 jets. Most are
based at NASA's Johnson Space Center in Houston, although LaRose is
stationed in El Paso, Texas, and two are based at Dryden. Since ferry
flights are seldom required, crew members train twice a year using
simulators belonging to United Airlines.
Perhaps the biggest challenge the crew faces during a ferry flight is
the weather. The orbiter cannot be exposed to moisture, turbulence or
temperatures below -9 Centigrade and these restrictions determine the
flight path and altitude. To meet those conditions in the winter months,
they sometimes fly as low as 10,000 feet.
A "Pathfinder" aircraft, usually a U.S. Air Force cargo plane, flies 100
miles ahead of the SCA carrying weather officers and Space Shuttle
personnel from Kennedy. Also onboard is an experienced SCA pilot, whose
expertise helps the ferry flight crew keep to the safest route.
Sunrise at the Shuttle Landing Facility, where the SCA waits to
departAdverse weather came into play on Discovery's recent ferry flight.
Storms and hail at Edwards kept the piggybacked pair grounded for a few
extra days. But every step of the way, people gathered to catch a
glimpse of the odd-looking duo.
Image to right: Sunrise at Kennedy's Shuttle Landing Facility reveals
the Shuttle Carrier Aircraft preparing to depart on Aug. 24. The plane
carried the orbiter Discovery on a ferry flight to Kennedy from Edwards
Air Force Base in California, arriving Aug. 21, 2005. NASA/KSC image
courtesy of Lynda Warnock
"You don't sneak into town with an orbiter," LaRose says, grinning. "It
brings out a big crowd everywhere we go. It's a life experience for a
lot of folks who have never seen something like this before."
NASA's John F. Kennedy Space Center
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