Crawler-transporter

Last updated

Crawler-transporter
Crawler-Transporter.jpg
Overview
Manufacturer Marion Power Shovel Company
Also calledMissile Crawler Transporter Facilities
Model years 1965
Powertrain
Engine
  • 2 × 2,050  kW (2,750  hp) V16 ALCO 251C diesel engines, driving 4 × 1,000 kW (1,341 hp) generators for traction
  • 2 × 794 kW (1,065 hp) engines driving 2 × 750 kW (1,006 hp) generators powering auxiliaries: jacking, steering, lighting, and ventilating.
Transmission 16 × traction motors, 4 per corner
Dimensions
Length40 m (131 ft)
Width35 m (114 ft)
HeightAdjustable, 6 to 8 m (20 to 26 ft)
Curb weight 2,721 t (6,000,000 lb) [1]
Missile Crawler Transporter Facilities
Location Kennedy Space Center, Florida
MPS John F. Kennedy Space Center MPS
NRHP reference No. 99001643 [2]
Added to NRHPJanuary 21, 2000

The crawler-transporters, formally known as the Missile Crawler Transporter Facilities, [2] are a pair of tracked vehicles used to transport spacecraft from NASA's Vehicle Assembly Building (VAB) along the Crawlerway to Launch Complex 39. They were originally used to transport the Saturn IB and Saturn V rockets during the Apollo, Skylab and Apollo–Soyuz programs. They were then used to transport Space Shuttles from 1981 to 2011. The crawler-transporters carry vehicles on the mobile launcher platforms used by NASA, and after each launch return to the pad to take the platform back to the VAB. [3]

Contents

The two crawler-transporters were designed and built by Marion Power Shovel Company using some components designed and built by Rockwell International at a cost of US$14 million (US$128.5 million in 2022) each. [4] Upon its construction, the crawler-transporter became the largest self-powered land vehicle in the world until it was beaten in 2013 with the production of the ultraheavy XGC88000 crawler crane. While other vehicles such as bucket-wheel excavators like Bagger 288, dragline excavators like Big Muskie and power shovels like The Captain are significantly larger, they are powered by external sources.

The two crawler-transporters were added to the National Register of Historic Places on January 21, 2000. [2]

Specifications

Diagram of a crawler-transporter Crawler-transporter cutaway view.gif
Diagram of a crawler-transporter

The crawler-transporter has a mass of 2,721 tonnes (6 million pounds; 2,999 short tons) and has eight tracks, two on each corner. [1] Each track has 57 shoes, and each shoe weighs 900 kg (1,984 lb). The vehicle measures 40 by 35 meters (131 by 114 ft). The height from ground level to the platform is adjustable from 6.1 to 7.9 m (20 to 26 ft), and each side can be raised and lowered independently of the other. The crawler uses a laser guidance system and a leveling system to keep the Mobile Launcher Platform level within 10 minutes of arc (0.16 degrees; about 30 cm (1 ft) at the top of the Saturn V), while moving up the 5 percent grade to the launch site. [5] A separate laser docking system provides pinpoint accuracy when the crawler-transporter and Mobile Launch Platform are positioned in the VAB or at the launch pad. [6] A team of nearly 30 engineers, technicians and drivers operate the vehicle, centered on an internal control room, and the crawler is driven from two control cabs located at either end. [7] [8] Before the launch the crawler-transporter is removed.

The crawlers were overhauled in 2003 with upgrades to the Motor Control Center, which houses the switchgear and electrical controls of all of major systems on board; a new engine and pump ventilation system; new diesel engine radiators; and replacement of the two driver cabs on each vehicle (one on each end). [7] As of 2003, each crawler had 16 traction motors, powered by four 1,000 kW (1,341 hp) generators, in turn driven by two 2,050 kW (2,750 hp) V16 ALCO 251C diesel engines. Two 750 kW (1,006 hp) generators, driven by two 794 kW (1,065 hp) engines, were used for jacking, steering, lighting, and ventilating. Two 150 kW (201 hp) generators were also available to power the Mobile Launcher Platform. The crawler's tanks held 19,000 liters (5,000 U.S. gal) of diesel fuel, and it burned 296 liters per kilometer (125.7 U.S. gal/mi). [1] Due to their age and the need to support the heavier Space Launch System and its launch tower, in 2012–2014 the crawlers were undergoing an upgrade involving "new engines, new exhausts, new brakes, new hydraulics, new computers"; CT-2 was further upgraded in 2014–2016 to increase its lifting capacity from 5,400 to 8,200 tonnes (12 to 18 million pounds). [4] [9] [10]

The crawlers traveled along the 5.5 and 6.8 km (3.4 and 4.2 mi) Crawlerways, to LC-39A and LC-39B, respectively, at a maximum speed of 1.6 kilometers per hour (1 mph) loaded, or 3.2 km/h (2 mph) unloaded. [8] [11] The average trip time from the VAB along the Crawlerway to Launch Complex 39 is about five hours. [1] Each Crawlerway is 2 m (7 ft) deep and covered with Alabama and Tennessee river rock for its low friction properties to reduce the possibility of sparks. In 2000, NASA unearthed and restored an Apollo-era segment of the Crawlerway to provide access to High Bay 2 in the VAB in order to provide protection from a hurricane for up to three Shuttles at the same time. [12]

Kennedy Space Center has been using the same two crawlers since their initial delivery in 1965. They are now nicknamed "Hans and Franz", after the parodic Austrian body-builder characters on Saturday Night Live , played by Dana Carvey and Kevin Nealon. [13] In their lifetime, they have traveled more than 5,500 km (3,400 mi), about the same driving distance as from Miami to Seattle. [7]

Future use

Crawler-Transporter 2

NASA currently plans to use crawler-transporter 2 to transport the Space Launch System with the Orion spacecraft atop it from the Vehicle Assembly Building to Launch Pad 39B for the Artemis missions. Early in 2016, NASA finished upgrading crawler-transporter 2 (CT-2) to a "Super Crawler" for use in the Artemis program. [10] NASA performed a rollout of the Artemis 1 Space Launch System and Orion on March 17, 2022 for the first Wet Dress Rehearsal, and the rollout for launch, which launched in November 2022. The rollout for the WDR, marked the first time one of the crawler transporters rolled a launch vehicle to the launch pad since STS-135. [14]

Crawler-Transporter 1

NASA had originally planned for crawler-transporter 1 to be used by commercial launch vehicles. [15] In April 2016, then Orbital ATK, now Northrop Grumman Innovation Systems, and NASA entered negotiations for the lease of CT-1 and one of the four Vehicle Assembly Building bays. [16] Northrop Grumman has originally planned to use CT-1 to transport their OmegA from the Vehicle Assembly Building to Launch Pad 39B. OmegA however was cancelled in September of 2020 after Northrop Grumman lost the National Security Space Launch contract to United Launch Alliance and SpaceX. [17]

The crawler-transporters have featured in television and movies. In a 2007 season three episode of Dirty Jobs , host Mike Rowe helps workers maintain a crawler-transporter and takes the vehicle for a short drive. [18] The crawler was also seen in the 1995 film Apollo 13 , the 2011 film Transformers: Dark of the Moon and the 2019 film Apollo 11 . Similar vehicles also appeared in the 2013 film Pacific Rim .

In the 2009 Fallout 3 video game add-on pack "Broken Steel", the US government survivors, The Enclave, have a mobile base built on and into a heavily modified crawler. In Sid Meier's Alpha Centauri , various units are called "crawlers" and feature chassis based on the crawler-transporters. In Asphalt 8: Airborne , three crawler-transporters drive over the space center French Guiana track.

See also

Related Research Articles

<span class="mw-page-title-main">Kennedy Space Center</span> United States space launch site in Florida

The John F. Kennedy Space Center, located on Merritt Island, Florida, is one of the National Aeronautics and Space Administration's (NASA) ten field centers. Since December 1968, KSC has been NASA's primary launch center of American spaceflight, research, and technology. Launch operations for the Apollo, Skylab and Space Shuttle programs were carried out from Kennedy Space Center Launch Complex 39 and managed by KSC. Located on the east coast of Florida, KSC is adjacent to Cape Canaveral Space Force Station (CCSFS). The management of the two entities work very closely together, share resources and operate facilities on each other's property.

<span class="mw-page-title-main">Space Shuttle program</span> 1972–2011 United States human spaceflight program

The Space Shuttle program was the fourth human spaceflight program carried out by the U.S. National Aeronautics and Space Administration (NASA), which accomplished routine transportation for Earth-to-orbit crew and cargo from 1981 to 2011. Its official name, Space Transportation System (STS), was taken from a 1969 plan for a system of reusable spacecraft of which it was the only item funded for development. It flew 135 missions and carried 355 astronauts from 16 countries, many on multiple trips.

<span class="mw-page-title-main">Vehicle Assembly Building</span> Spacecraft assembly building operated by NASA at the Kennedy Space Center

The Vehicle Assembly Building, or VAB, is a large building at NASA's Kennedy Space Center (KSC), designed to assemble large pre-manufactured space vehicle components, such as the massive Saturn V, the Space Shuttle and the Space Launch System, and stack them vertically onto one of three mobile launcher platforms used by NASA. As of March 2022, the first Space Launch System (SLS) rocket was assembled inside in preparation for the Artemis 1 mission, launched on November 16, 2022.

<span class="mw-page-title-main">Constellation program</span> Cancelled 2005–2010 NASA human spaceflight program

The Constellation program was a crewed spaceflight program developed by NASA, the space agency of the United States, from 2005 to 2009. The major goals of the program were "completion of the International Space Station" and a "return to the Moon no later than 2020" with a crewed flight to the planet Mars as the ultimate goal. The program's logo reflected the three stages of the program: the Earth (ISS), the Moon, and finally Mars—while the Mars goal also found expression in the name given to the program's booster rockets: Ares. The technological aims of the program included the regaining of significant astronaut experience beyond low Earth orbit and the development of technologies necessary to enable sustained human presence on other planetary bodies.

<span class="mw-page-title-main">Kennedy Space Center Launch Complex 39A</span> Historic launch pad operated by NASA and SpaceX

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<span class="mw-page-title-main">Kennedy Space Center Launch Complex 39</span> Historic Apollo Moonport

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<span class="mw-page-title-main">Mobile launcher platform</span> Structure used to support large rockets

A mobile launcher platform (MLP), also known as mobile launch platform, is a structure used to support a large multistage space vehicle which is assembled (stacked) vertically in an integration facility and then transported by a crawler-transporter (CT) to a launch pad. This becomes the support structure for launch.

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<span class="mw-page-title-main">Crawlerway</span> United States historic place

The Crawlerway is a 130-foot-wide (40 m) double pathway at the Kennedy Space Center in Florida. It runs between the Vehicle Assembly Building and the two launch pads at Launch Complex 39. It has a length of 3.4 and 4.2 miles to Pad 39A and Pad 39B, respectively. A seven-foot (2 m) bed of stones lies beneath a layer of asphalt and a surface made of Alabama river rocks.

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<span class="mw-page-title-main">Kennedy Space Center Launch Complex 39B</span> Historic launch pad operated by NASA

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References

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