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It was carried on the 1971 Apollo 14 mission and was planned to be used on Apollo 15, but was used only on Apollo 14 since Apollo 15's mission was changed to be the first to employ the motorized Lunar Roving Vehicle, which transported both astronauts and equipment. Astronauts nicknamed the MET "the rickshaw". It was pulled using a pulling bar ...
It also had several cargo compartments used to carry, among other things: the Apollo Lunar Surface Experiment Packages ALSEP, the modularized equipment transporter (MET) (a hand-pulled equipment cart used on Apollo 14), the Lunar Rover (Apollo 15, 16 and 17), a surface television camera, surface tools, and lunar sample collection boxes.
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 ...
Each wheel had its own electric drive made by Delco, a brushed DC electric motor capable of 0.25 horsepower (190 W) at 10,000 rpm, attached to the wheel via an 80:1 harmonic drive, and a mechanical brake unit. In the case of drive failure, astronauts could remove pins to disengage the drive from the wheel, allowing the wheel to spin freely.
The wheels and basket of the chariot were usually of wood, strengthened in places with bronze or iron. The wheels had from four to eight spokes and tires of bronze or iron. Due to the widely spaced spokes, the rim of the chariot wheel was held in tension over comparatively large spans.
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