Astrobotic sets record for 300-sec hot-firing Chakram rocket engine test | Each engine produced over 4,000 pounds of thrust | Inshorts  InshortsNew video shows a next-gen ‘ring of fire’ rocket engine hit a major milestone  Scientific AmericanAstrobotic fires next-generation ‘rotating detonation rocket engine’ in record-breaking test (video)  SpaceAstrobotic’s Detonation Engine Fires 4,000 Pounds of Thrust in Wild Test  Gizmodo