section_path: Launch vehicles/Eclipse/Previous designs
section_name: Previous designs
paragraph_text: Previous designs
  
  Firefly previously pursued a medium-lift launch vehicle design known as Firefly Beta, which consisted of three Alpha cores strapped together. In October 2019, Firefly announced a partnership with Aerojet Rocketdyne to develop a single core rocket potentially powered by the Aerojet Rocketdyne AR1 engine. In 2020, the Beta was redesigned to be a scaled up Alpha. The first stage would be 3.7 m (12 ft) in diameter with 5 Reaver 2 engines capable of delivering 8000 kg to LEO or 5800 kg to SSO inside a 4.7 m (15 ft) fairing. In October 2021, the first Beta launch was planned for the second half of 2024.