A decade ago, Aerojet Rocketdyne and the Air Force Research Laboratory powered the first hydrocarbon-fueled and cooled air-breathing hypersonic flight test. Now, Huntsville-based Aerojet Rocketdyne has done it again — achieving record levels of thrust by a scramjet engine. The AFRL-Aerojet Rocketdyne team recently finished successful testing of an advanced air-breathing hypersonic engine. “Our scramjet…