Energy use is another factor. The EU just nixed rules which could have allowed new generations of supersonic air travel due mostly to this concern.
This seems to be inherent to the physics: air resistance rises with the cube of speed. You could make up for it by flying higher, but then you're expending more energy to get up there.
An engine consuming hydrogen may open a door for renewable production. But we're not at the limit in what the grids can absorb, and may never get there with how battery storage and smart consumer-side tech is advancing.
This seems to be inherent to the physics: air resistance rises with the cube of speed. You could make up for it by flying higher, but then you're expending more energy to get up there.
An engine consuming hydrogen may open a door for renewable production. But we're not at the limit in what the grids can absorb, and may never get there with how battery storage and smart consumer-side tech is advancing.