Happy Anniversary Shuttle Crawlers

Jan 26, 2006

"NASA's workhorses" are celebrating their 40th anniversary. The twin crawler transporters, built at NASA's Kennedy Space Center in Florida for the Apollo program, are still making tracks today.

Originally designed to carry the towering Saturn V moon rocket from the Vehicle Assembly Building to the seaside launch site, the enormous transporters now carry the space shuttles to the launch pads for liftoff.

"The reason we've been that successful isn't because we've got a 50-year, 5,000-mile warranty" on the crawlers, NASA shuttle processing director Mike Wetmore told an enthusiastic crowd during a Jan. 13 anniversary celebration. "It's because of the efforts of the guys behind me who've kept these machines running."

Current and former employees joined the grown children of two of the main designers of the machines for a ceremony in front of a 5.5-million-pound crawler. After cutting into a cake decorated with a photo of the transporter, the group joined about 40 media on a tour of the giant contraption as it crept along at a speed of about one mile an hour, crushing rocks to dust in its wake.

In January 1966, the crawler completed its first successful move by hauling a 10.6-million-pound launch umbilical tower three-quarters of a mile.

At first glance, the crawler's imposing size eclipses its high-tech capabilities. It's strong enough to lift space shuttles and moon rockets, precise enough to place them within a fraction of an inch of their destination, and delicate enough to keep its surface level so its towering cargo stays perfectly vertical throughout the roughly six-hour ride.

The crawler transporters are 131 feet long and 113 feet wide, with a flat upper deck measuring 90 feet square -- about the size of a baseball diamond -- that serves as the carrying surface. They move on four double-tracked tread belts, similar to those on a military tank. Each contains 57 "shoes" weighing more than a ton apiece.

Each transporter is powered by two 2,750-horsepower diesel engines. The hydraulic system includes 16 jacking, equalizing and leveling cylinders, which keep the crawler's surface level at all times. This leveling system keeps the shuttle from deviating, only allowing the top of the orbiter to move in an arc about the diameter of a basketball during its journey -- even as the crawler climbs the short hill to the launch pad.

"It's good that people recognize a piece of technology that has endured through two programs -- I guess really three, if you include Skylab," said crawler systems engineer Bob Myers.

During their four decades of service, these workhorses have transported seven different types of launch vehicles, including the gigantic Saturn V and all five space shuttles. Every Apollo moon mission began with a crawler ride to the launch pad, as has every shuttle mission.

Given their successful track record, the crawlers may not be ready for retirement anytime soon.

"It took a lot of people to keep it rolling for 40 years, and I'm just glad it's still here to go," Myers said. "I hope it goes for another 40 years."

Wetmore confirmed he shares the same wish: "We're hoping that in the future it'll also be carrying a crew launch vehicle and a cargo launch vehicle to support our return to the moon and on to Mars."

Copyright 2006 by Space Daily, Distributed United Press International

Explore further: Bad weather delays SpaceX launch with 3-D printer

add to favorites email to friend print save as pdf

Related Stories

NASA's colossal crawler gets souped-up for SLS

Sep 07, 2012

One of NASA's two iconic crawler-transporters—the 2,750-ton monster vehicles that have delivered rockets from Saturns to Shuttles to launch pads at Kennedy Space Center for nearly half a century—is getting ...

Shuttles carried to the pad by slow-motion giants

Sep 28, 2010

For more than 40 years, the twin crawler-transporters at NASA's Kennedy Space Center have traveled the gravel track between the massive Vehicle Assembly Building and the two launch pads at Launch Complex 39. ...

Engineers building hard-working mining robot

Jan 29, 2013

(Phys.org)—After decades of designing and operating robots full of scientific gear to study other worlds, NASA is working on a prototype that leaves the delicate instruments at home in exchange for a sturdy ...

Image: Endeavour on the Pad

Mar 11, 2011

(PhysOrg.com) -- Bathed in xenon lights, space shuttle Endeavour, attached to its external fuel tank and solid rocket boosters, took one last journey from the Vehicle Assembly Building to Launch Pad 39A at ...

NASA's space shuttle discovery rolls off launch pad tuesday

Dec 21, 2010

Space shuttle Discovery is scheduled to roll back from Launch Pad 39A to the Vehicle Assembly Building (VAB) at NASA's Kennedy Space Center in Florida for additional work related to its final scheduled mission. The first ...

Recommended for you

Internet moguls Musk, Bezos shake up US space race

14 hours ago

The space race to end America's reliance on Russia escalated this week with a multibillion dollar NASA award for SpaceX's Elon Musk and an unexpected joint venture for Blue Origin's Jeff Bezos.

The Great Cold Spot in the cosmic microwave background

Sep 19, 2014

The cosmic microwave background (CMB) is the thermal afterglow of the primordial fireball we call the big bang. One of the striking features of the CMB is how remarkably uniform it is. Still, there are some ...

User comments : 0