Each Raptor engine cannot throttle down below about 40% of its maximum thrust [0], so they must completely shut down some of the engines in order to achieve the

Each Raptor engine cannot throttle down below about 40% of its maximum thrust [0], so they must completely shut down some of the engines in order to achieve the lower required thrust for hovering or landing. [0]: https://twitter.com/elonmusk/status/1295553672454311941 https://twitter.com/elonmusk/status/1295553672454311941