| Crawler-transporter | |
|---|---|
 | |
| Overview | |
| Manufacturer | Marion Power Shovel Company |
| Also called | Missile Crawler Transporter Facilities |
| Model years | 1965 |
| Powertrain | |
| Engine |
|
| Transmission | 16 × traction motors, 4 per corner |
| Dimensions | |
| Length | 40 m (131 ft) |
| Width | 35 m (114 ft) |
| Height | Adjustable, 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 NRHP | January 21, 2000 |
Thecrawler-transporters, formally known as theMissile Crawler Transporter Facilities,[2] are a pair oftrackedvehicles used to transportlaunch vehicles fromNASA'sVehicle Assembly Building (VAB) along theCrawlerway toLaunch Complex 39. They were originally used to transport theSaturn IB andSaturn Vrockets during theApollo,Skylab andApollo–Soyuz programs. They were then used to transportSpace Shuttles from 1981 to 2011. The crawler-transporters carry vehicles on themobile launcher platforms (MLPs) used by NASA, and after each launch return to the pad to take the platform back to the VAB.[3]
The two crawler-transporters were designed and built byMarion Power Shovel Company using some components designed and built byRockwell International at a cost ofUS$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 ultraheavyXGC88000 crawler crane. While other vehicles such asbucket-wheel excavators likeBagger 288,dragline excavators likeBig Muskie andpower shovels likeThe 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]
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 theMobile Launcher Platform level within 10minutes 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] After the 2003 refit, 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) V16ALCO 251Cdiesel 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 heavierSpace 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, toLC-39A andLC-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 bodybuilder characters onSaturday Night Live, played byDana Carvey andKevin Nealon.[13] In their lifetime, they have traveled more than 5,500 km (3,400 mi), about the same driving distance as fromMiami toSeattle.[7]
NASA currently uses crawler-transporter 2 to transport theSpace Launch System with theOrion spacecraft atop it from theVehicle Assembly Building toLaunch Pad 39B for theArtemis missions. Early in 2016, NASA finished upgrading crawler-transporter 2 (CT-2) to a "Super Crawler" for use in theArtemis program.[10] NASA performed a rollout of theArtemis 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 sinceSTS-135.[14]
NASA had originally planned for crawler-transporter 1 to be used by commercial launch vehicles.[15] In April 2016, then Orbital ATK, nowNorthrop 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 planned to use CT-1 to transport theirOmega from the Vehicle Assembly Building toLaunch Pad 39B. Omega was cancelled in September 2020 after Northrop Grumman lost theNational Security Space Launch contract toUnited Launch Alliance andSpaceX.[17]
The crawler-transporters have featured in television and movies. In a 2007season three episode ofDirty Jobs, hostMike Rowe helps workers maintain a crawler-transporter and takes the vehicle for a short drive.[18] The crawler was also seen in the 1995 filmApollo 13, the 2011 filmTransformers: Dark of the Moon and the 2019 filmApollo 11. Similar vehicles also appeared in the 2013 filmPacific Rim.
In the 2009Fallout 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. InSid Meier's Alpha Centauri, various units are called "crawlers" and feature chassis based on the crawler-transporters. InAsphalt 8: Airborne, three crawler-transporters drive over the space center French Guiana track.
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