Propulsion-hydrogen

Readers write about hydrogen propulsion, aerospace business, Artemis II mission, a Mars shuttle, Airbus autonomy tests and the UK and the F-35 program.

Regional rotorcraft; AAM flight planning; Ultra-low-NOx propulsion; and LH2 for UAVs.

Readers write about portable power stations, objectivity in space coverage, the F-35 and our B-21 and B-2 rollout covers.

Ambitious large scale airframe modification programs will convert two A380s into flying technology testbeds for a hydrogen fuel cell, hydrogen combustion and an