Stratolaunch Systems, a subsidiary of Vulcan Aerospace, is a space transportation venture developing a new air launch to orbit system. The corporate headquarters is located in Seattle, Washington USA.
The purpose of the new company was to develop an aircraft-launched space transportation system, similar to the Pegasus rocket which is successfully operated by Orbital ATK, Virgin Galactic WhiteKnight and few other projects, but on an orbital rather than suborbital level.
The project is a mobile launch system with three primary components; a carrier aircraft being built by Scaled Composites (currently a subsidiary of Northrop), a multi-stage payload ‘launch vehicle’ which would be launched at high altitude into space from under the carrier aircraft, plus a mating and integration system by Dynetics. The Stratolaunch system will be able to deliver payload to space with lower cost comparing to conventional rockets and will be more independent from weather conditions; it will be also independent from expensive rocket launch sites due the fact that it will operate from ordinary runways. It will start from airfield, reach designated altitude, deploy rocket with payload, return and land on the airfield. Stratolaunch Systems have targeted a first test flight for 2016.
Since 2015 Stratolaunch Systems is operating under the supervision of Paul Allen's new company Vulcan Aerospace, a subsidiary of Vulcan, Inc.
The project started in 2010 and officially announced in December 2011 by Microsoft co-founder Paul G. Allen and Scaled Composites founder Burt Rutan, who had previously collaborated on the creation of Richard Branson Virgin Galactic’s SpaceShipOne. The project started almost a year before the public announcement was made. Development costs were initially projected to be 300 million USD in 2011.
To reduce costs, Paul Allen bought two Boeing 747-400 to utilize engines, avionics, landing gear and minor parts for building prototype of Stratolauncher. Plane was designed from the beginning as extremely large, equipped with twin fuselage and wingspan at 116 meters (largest wingspan plane ever produced) and able to lift up to 250 tonnes (rocket with payload). Place with latches for second stage rocket were designed between fuselages. Propulsion of the plane will be six engines from Boeing 747-400, which will be also source of avionics, landing gear and other minor systems. Engines will be installed under the wings on the left and right side of the twin fuselage. Pilots and operators will take place in right fuselage; both fuselages are different in shape than Boeing 747-400-they are quite similar to shape of the fuselage in flying boat.
The launch system is composed of three main components, each provided by one of the corporate partners that composed Stratolaunch. The 116 meter wingspan carrier aircraft was to be designed by Scaled Composites. A multi-stage booster, based on the Falcon 9 rocket, was to be developed by SpaceX. A mating and integration system to interface the two was to be designed by Dynetics.
Dynetics actually began work in early 2010 and had approximately 40 employees working on the project as of December 2011. Dynetics was cited as responsible for the total systems engineering, integration and testing, which includes aerodynamics, loads, and interfaces.
It was announced the SpaceX Corporation was also already working on the design for the rocket-powered space vehicle components of the system.
Since the formation of the partnership, the Stratolaunch launcher has undergone some design changes, including a chine extended along the wing root to provide lift. The changes drifted far enough away from the original idea for a winged-Falcon 9, that it lost commonalities with that rocket.
Development of the new design would have required changes to SpaceX's manufacturing process and departed from the company’s objective of achieving cost effective spaceflight through simplicity and commonality of design.
On November 27th 2012, Stratolaunch CEO Gary Wentz announced that SpaceX would leave the Stratolaunch Partnership. Stratolaunch and SpaceX had amicably agreed to end the contractual relationship because the current launch vehicle design had departed significantly from the Falcon derivative vehicle envisioned by SpaceX and did not fit well with SpaceX long-term strategic business model.
SpaceX was then replaced in the Stratolaunch Partnership by Orbital Sciences (Orbital ATK), the company behind the air-launched Pegasus rocket first launched in 1990. Orbital Sciences is now trying to match SpaceX's feat of providing commercial cargo supply runs to the International Space Station. Orbital ATK will initially provide multiple Pegasus XL air-launch vehicles for use with the Stratolaunch aircraft to provide customers with unparalleled flexibility to launch small satellites weighing up to 1,000 pounds into low Earth orbit. Pegasus has carried out 42 space launch missions, successfully placing more than 80 satellites into orbit for scientific, commercial, defense and international customers.
In November 2015 Gary Wentz stepped down as CEO to join United Launch Alliance (ULA) to lead human launch services for ULA. Jean Floyd replaced Wentz as CEO of Stratolaunch Systems and Executive Director of Vulcan Aerospace.
Vulcan ended its contract with Orbital ATK in mid-2015 and indicated that a decision on a new rocket for the Stratolaunch Carrier Aircraft would be made in late 2015.
The company completed its first 88,000 sq. feet (8,175 sq. meter) composites production building in October 2012. In February 2013, the construction of its 92,640 sq. feet (8,606 sq. meter) carrier assembly hangar and operations facilities at the Mojave Air and Space Port was completed. The hangar would house the world's largest aircraft, 380 foot (116 meter) wingspan.
The carrier aircraft was originally projected to make its first test flight in 2015. By October 2013, the first flight of the carrier aircraft had been pushed back until 2016, with the first flight of the air-launched rocket expected in 2018.
www.spacesafetymagazine.com Edition 28 November 2012
www.flyorbitnews.com Edition 10 October 2016 www.wikipedia.org
www.yahoo.com Yahoo News Edition 02 October 2015