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In October 2016 Stratolaunch partnered with Orbital ATK to use the existing Pegasus XL rocket on its aircraft.
In April 2018 Stratolaunch planned three more taxi tests before attempting the airplane’s first flight and expected the final taxi test to reach about 220 km per hour.
Stratolaunch plans to initially use the airplane for launches of Pegasus XL rockets provided by Northrop Grumman Innovation Systems.
Stratolaunch performed its fastest taxi test to date at the Mojave Air and Space Port in California on 2019-01-09, reaching a top speed of 219 km per hour.
Stratolaunch is developing an engine called PGA that uses liquid oxygen and liquid hydrogen propellants and produces 90,718 kg-force of thrust.
Once airborne, Stratolaunch expected the airplane’s flight test program to take 18 to 24 months to complete and receive an airworthiness certificate from the Federal Aviation Administration.
Stratolaunch is developing its own launch vehicles, including the Medium Launch Vehicle capable of placing 3,400 kg into low Earth orbit.
Stratolaunch fired the preburner for its PGA engine on 2018-11-02 in a test at NASA’s Stennis Space Center in Mississippi.
Paul G. Allen announced the founding of Stratolaunch in 2011.
Paul Allen returned to the space business in 2011 by funding Stratolaunch Systems to develop a large-scale air-launch system.
Stratolaunch performed a taxi test that reached speeds of about 130 km per hour and met all objectives on 2018-10-11.
Stratolaunch is developing a Medium Launch Vehicle capable of placing up to 3,400 kg into low Earth orbit.
Stratolaunch plans to use the Pegasus XL rocket from Northrop Grumman for some missions.
Stratolaunch revealed new details on 2018-09-27 about a rocket engine it is developing for use on future launch vehicles flown from its giant aircraft.
Stratolaunch is developing a Heavy version of the Medium Launch Vehicle with three first stages capable of placing up to 6,000 kg into low Earth orbit.
Stratolaunch planned for its Medium Launch Vehicle to make its first flight in 2022.
Stratolaunch signed a Space Act Agreement in September to perform engine testing at NASA’s Stennis Space Center.
Stratolaunch plans to perform a full-scale test of the PGA preburner by the end of 2018 at NASA’s Stennis Space Center in Mississippi.
Stratolaunch is a Paul Allen–funded company developing a large air-launch system.
Stratolaunch reached an agreement with Orbital ATK in 2016 to use the Pegasus rocket on its carrier aircraft with the ability to launch as many as three Pegasus rockets on a single flight.