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At what inclined grade would Curiosity or Perseverance require twice the electrical power to drive compared to driving on flat terrain?

Space Exploration Asked on December 24, 2021

Motors have losses and friction, and compaction of soil by a rovers wheels are lossy as well. Driving over bumps/topography requires extra work going up that isn’t recovered when going back down.

The terrain that Curiosity and Perseverance traverse is varied, but is it possible to give some estimate for the incline angle that would require either one to use twice the electrical power to drive compared to a flat grade? I’m thinking mostly about the work required to raise it’s 900 kg up against Mars’ 3.72 m/s^2 gravity but maybe there are other effects as well.

Question: At what inclined grade would Curiosity or Perseverance require twice the electrical power to drive compared to driving on flat terrain?

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