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martyb writes:

NASA reveals the new wavy Martian wheels it thinks can crush the red planet:

NASA has revealed the wheels it's just bolted onto the Perseverance Rover, the new Mars assault robot it plans to send to the red planet in July as part of the Mars 2020 mission.

Wheels matter because NASA's Curiosity rover has had trouble keeping a grip on Mars. As we reported in 2017, Curiosity has been popping unintentional wheelies as its six wheels struggle over rocks and sand. While a software patch delivered the robot a new a traction control algorithm that keeps it grounded and lessens wear on wheels, the vehicle's wheels have holes and cracks thanks to pressure produced when rolling over sharp rocks.

Those holes are a worry because the rover doesn't carry a spare and even if it did, good luck finding someone to fit it!

NASA's Perseverance Mars Rover Gets Its Wheels and Air Brakes – NASA's Mars Exploration Program:

Final assembly and testing of NASA's Perseverance rover continues at Kennedy Space Center in Florida as the July launch window approaches. In some of the last steps required prior to stacking the spacecraft components in the configuration they'll be in atop the Atlas V rocket, the rover's wheels and parachute have been installed.

[...] Machined out of a block of flight-grade aluminum and equipped with titanium spokes, each wheel is slightly larger in diameter and narrower than Curiosity's, with skins that are almost a millimeter thicker. They also feature new treads, or grousers: In place of Curiosity's 24 chevron-pattern treads are 48 gently curved ones. Extensive testing in the Mars Yard at NASA's Jet Propulsion Laboratory, which built the rover and manages operations, has shown these treads better withstand the pressure from sharp rocks and grip just as well or better than Curiosity's when driving on sand.

[...] The job of adding Perseverance's parachute to the back shell, where the rover will be stowed on the journey to the Red Planet, took several days and was finished on March 26. Tasked with slowing the heaviest payload in the history of Mars exploration from Mach 1.7 to about 200 mph (320 kph) during the rover's landing on Feb., 18, 2021, the 194 pounds (88 kilograms) of nylon, Technora and Kevlar fibers are packed so tightly into a 20-inch-wide (50-centimeter-wide) aluminum cylinder that it is as dense as oak wood. When deployed at about 7 miles (11 kilometers) above the Martian surface, the chute will take about a half-second to fully inflate its 70.5-foot-wide (21.5-meter-wide) canopy.

The Perseverance rover is a robotic scientist weighing 2,260 pounds (1,025 kilograms). It will search for signs of past microbial life, characterize the planet's climate and geology, collect samples for future return to Earth, and pave the way for human exploration of the Red Planet. No matter what day Perseverance launches during its July 17-Aug. 5 launch period, it will land on Mars' Jezero Crater on Feb. 18, 2021.

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