United Launch Alliance unveiled an incremental approach to replace its workhorse Atlas 5 rocket, an ambitious path forward that ultimately would include a new second stage and, later, reusable first-stage engines that would be captured midair by helicopter after each mission.
The plan would provide a competitive alternative to SpaceX’s low-cost Falcon 9 rocket but entails risk for ULA as it funds a significant development program for as many as nine years as its competition gains momentum.
Tory Bruno, ULA’s president and chief executive, declined to detail the company’s exact investment in the project but suggested that new rockets typically cost about $2 billion to develop, including the main engine. During an April 13 press conference on the eve the 31st Space Symposium here, he said that cost would be borne by ULA and its strategic partners, but that the company would not turn down government money if that becomes available.
The first step in the developing the newly named Vulcan rocket is developing a new first stage featuring the methane-fueled BE-4 engine by Blue Origin of Kent, Washington. ULA is also working with Aerojet Rocketdyne on the AR-1 engine, in case the BE-4 runs into delays.
The program is driven by the requirement to replace the Russian-built RD-180 engine that serves as the main powerplant for ULA’s Atlas 5. Congress imposed a ban on future use of Russian engines in U.S. national security missions following Russia’s annexation of Crimea from Ukraine last year.
In addition to the new engine, the Vulcan’s first stage would feature a stretch version of the tank used on ULA’s Delta 4 rocket, which the company is phasing out in 2018 because it is too expensive. The second stage of the initial Vulcan version, slated to debut around 2019, would feature the same Centaur upper stage and fairing now used on the Atlas 5, Bruno said.
The Vulcan could be augmented by up to six solid rocket boosters, giving it greater lift capability than the largest version of the Atlas 5 but not as much as the Delta 4 Heavy, which features three core stages in a side-by-side configuration. Bruno said he plans to issue a request for proposals within the next 12 months for the large boosters, which would likely be built by either Orbital ATK or Aerojet Rocketdyne.
ULA told the Air Force in February it plans to start two separate U.S. Air Force certification processes for the rocket later this year, one with the BE-4 and one with the AR-1. Certification is required for the Vulcan to carry U.S. national security payloads.
Bruno said ULA’s first choice is the BE-4 but that it continues to fund the AR-1 work as a backup option, and that ULA will make a final decision on in 2016.
link.
No comments:
Post a Comment