|Manufacturer||Sierra Nevada Corporation|
|Country of origin||United States|
|Spacecraft type||Unmanned cargo vehicle|
5,000 kg (5.0 t; 11,000 lb) pressurized,500 kg (0.50 t; 1,100 lb) unpressurized
|Derived from||Unmanned HL-20 Personnel Launch System|
|Manufacturer||Sierra Nevada Corporation|
|Derived from||HL-20 Personnel Launch System|
The Dream Chaser Cargo System is an American reusable lifting-body spaceplane being developed by Sierra Nevada Corporation (SNC) Space Systems. The Dream Chaser is designed to resupply the International Space Station with both pressurized and unpressurized cargo. The vehicle will launch vertically on an Atlas V, Ariane 5 or Falcon Heavy rocket, and autonomously land horizontally on conventional runways. Potential further development of the spaceplane includes a crewed version, the Dream Chaser Space System, which would be capable of carrying up to seven people to and from low Earth orbit.
- 1 Design
- 2 History
- 2.1 SpaceDev Dream Chaser proposal
- 2.2 Dream Chaser Global Project
- 2.3 Dream Chaser Cargo System
- 2.4 Testing
- 3 Status
- 4 Technology partners
- 5 See also
- 6 References
- 7 External links
This section needs expansion. You can help by adding to it. (March 2016)
On-orbit propulsion of the Dream Chaser was supposed to be provided by twin hybrid rocket engines fueled with non-toxic and storable hydroxyl-terminated polybutadiene (HTPB) and nitrous oxide. Unlike solid rockets, Dream Chaser's hybrid fuel system would allow the motor to stop and start repeatedly and be throttleable. SNC Space Systems was also developing a similar hybrid rocket, RocketMotor Two, for Virgin Galactic's SpaceShipTwo, as a subcontractor to Scaled Composites. In May 2014 their involvement in the program ended after Virgin Galactic elected to replace SNC's version of RocketMotorTwo, powered by HTBD rubber fuel, with its own internally developed hybrid motor using a polyamide plastic fuel, while continuing to use the same nitrous oxide oxidizer.
After the acquisition of Orbitec LLC in July 2014, Sierra Nevada Corporation announced a major change to the propulsion system. The hybrid rocket engine design was dropped in favor of a cluster of Orbitec's Vortex engines. The new engines would use propane and nitrous oxide as propellants.
Dream Chaser Space System
Dream Chaser Space System is a planned human-rated version designed to carry from two to seven people and cargo to orbital destinations such as the International Space Station. It is to have a built-in launch escape system and could fly autonomously if needed. Although it could use any suitable launch vehicle, it is currently planned to be launched on a human-rated Atlas V 412 rocket. The vehicle is to be able to return from space by gliding (typically experiencing less than 1.5 g on re-entry) and landing on any airport runway that handles commercial air traffic. Its reaction control system thrusters burn ethanol-based fuel, which is not an explosively volatile material, nor toxic like hydrazine, allowing the Dream Chaser to be handled immediately after landing, unlike the Space Shuttle. Its thermal protection system (TPS) is an ablative tile created by NASA's Ames Research Center that would be replaced as a large group rather than tile by tile, and would need to be replaced only after several flights.
The historical antecedents of the Dream Chaser in the U.S. go back to the mid-twentieth century X-20 Dyna-Soar concept of 1957 and the 1966 Northrop M2-F2 and Martin X-23 PRIME lifting bodies. Its design is derived from NASA's 1990 HL-20 lifting body design which was itself similar to the 1980s Soviet BOR-4, which in turn was considered by NASA engineers as influenced by the late 1960s HL-10, and the Soviet "Spiral"(Mikoyan-Gurevich MiG-105), a military spaceplane concept, the latter having been studied as a means to develop a Cold War Soviet counterpart to the US's X-20 Dyna-Soar.
The name "Dream Chaser" has been used for two separate space vehicles. One, planned to be an orbital vehicle based on the NASA HL-20, originated at SpaceDev when Jim Benson was still there. The second, a suborbital vehicle, was the result of Jim Benson's having reused the name when he formed the Benson Space Company for the purposes of space tourism.
On 24 June 2011, SNC announced it had achieved two critical milestones for NASA's CCDev program. The first was a Systems Requirement Review (SRR), where SNC validated their requirements based on NASA’s draft Commercial Crew Program Requirements. The SRR was successfully completed on 1 June 2011, with participation from NASA and SNC industry partners. The second milestone was a review of the improved airfoil fin shape for Dream Chaser used to aid its control through the atmosphere. Testing in a wind tunnel and computational fluid dynamics analyses allowed the fin selection to pass the NASA milestone.
As of October 2011[update], Sierra Nevada Corp had completed four of the 13 milestones set out in the CCDev Agreement. The most recent milestones accomplished include: a System Requirements Review, a new cockpit simulator, finalizing the tip fin airfoil design and most recently, a Vehicle Avionics Integration Laboratory (VAIL), which will be used to test Dream Chaser computers and electronics in simulated space mission scenarios.
By February 2012, Sierra Nevada Corporation stated that it had completed the assembly and delivery of the primary structure of the first Dream Chaser flight test vehicle. With this, SNC completed all 11 of its CCDev milestones that were scheduled up to that point. SNC stated in a press release that it was "...on time and on budget."
On 24 April 2012, Sierra Nevada Corporation announced the successful completion of wind tunnel testing of a scale model of the Dream Chaser vehicle.
On June 12, 2012 SNC announced the commemoration of its fifth year as a NASA Langley partner in the design and development of Dream Chaser. Together with ULA, the NASA/SNC team performed buffet tests on the Dream Chaser and Atlas V stack. To date, the Langley/SNC team has worked on aerodynamic and aerothermal analysis of Dream Chaser, as well as guidance, navigation, and control systems.
On July 11, 2012 SNC announced that it successfully completed testing of the nose landing gear for Dream Chaser. This milestone evaluated the impact to the landing gear during simulated approach and landing tests as well as the impact of future orbital flights. The main landing gear was tested in a similar way in February 2012. The nose gear landing test was the last milestone to be completed before the free flight approach and landing tests scheduled for later in 2012.
In August 2012, SNC completed CCiCap Milestone 1, or the ‘Program Implementation Plan Review’. This included creating a plan for implementing design, development, testing, and evaluation activities through the duration of CCiCap funding.
By October 2012 the "Integrated System Baseline Review", or CCiCap Milestone 2, had been completed. This review demonstrated the maturity of the Dream Chaser Space System as well as the integration and support of the Atlas V launch vehicle, mission systems, and ground systems.
On January 30, 2013 SNC announced a new partnership with Lockheed Martin. Under the agreement, SNC will pay Lockheed Martin $10 million to build the second airframe at its Michoud facility in New Orleans, Louisiana. This second airframe is slated to be the first orbital test vehicle, with orbital flight testing planned to begin within the next two years. In January 2014, SNC announced it had signed a launch contract to fly the first orbital test vehicle on a robotically controlled orbital test flight in November 2016.
In January 2013, Sierra Nevada also announced that the second captive carry and first unpowered drop test of Dream Chaser would take place at Edwards Air Force Base, California in March 2013. The spaceplane release would occur at 12,000 feet (3,700 m) altitude and would be followed by an autonomous robotic landing.
On March 13, 2013, NASA announced that former space shuttle commander Lee Archambault was leaving the agency in order to join SNC. Archambault, a former combat pilot and 15-year NASA veteran who flew on Atlantis and Discovery, will work on the Dream Chaser program as a systems engineer and test pilot.
On April 29, 2013, Virgin Galactic's SpaceShipTwo sub-orbital vehicle was propelled on its first ever powered flight by SNC’s Hybrid Rocket Motor. SNC manufactures the main oxidizer valve and the hybrid rocket motor, plus the nitrous oxide dump and pressurization system control valves. The hybrid rocket motor and oxidizer valve system are manufactured at an SNC facility in Poway, California, where motors for both Space Ship Two and Dream Chaser are produced.
SpaceDev Dream Chaser proposal
Commercial Orbital Transportation Services
The Dream Chaser was publicly announced on September 20, 2004 as a candidate for NASA's Vision for Space Exploration and later Commercial Orbital Transportation Services Program (COTS).
When the Dream Chaser was not selected under Phase 1 of the COTS Program, SpaceDev founder James Benson stepped down as Chairman of SpaceDev and started Benson Space Company to pursue the development of the Dream Chaser. In April 2007, SpaceDev announced that it had partnered with the United Launch Alliance to pursue the possibility of using the Atlas V booster rocket as the Dream Chaser's launch vehicle. In June 2007, SpaceDev signed a Space Act agreement with NASA.
Commercial Crew Development
About two weeks after Benson's October 10, 2008 death, SpaceDev agreed to be acquired by Sierra Nevada Corporation, a privately owned company operated by Fatih Ozmen and Eren Ozmen, on October 21, 2008 for US$38 million. On February 1, 2010, Sierra Nevada Corporation was awarded $20 million in seed money under NASA’s Commercial Crew Development (CCDev) phase 1 program for the development of the Dream Chaser. Of the $50 million awarded by the CCDev program, Dream Chaser's award represented the largest share of the funds. SNC completed the four planned milestones on time which included program implementation plans, manufacturing readiness capability, hybrid rocket test fires, and the preliminary structure design. Further initial Dream Chaser tests included the drop test of a 15% scaled version at the NASA Dryden Flight Research Center. The 1.5 m (5 ft) model was dropped from an altitude of 14,000 feet (4,300 m) to test flight stability and collect aerodynamic data for flight control surfaces.
For the CCDev phase 2 solicitation by NASA in October 2010, Sierra Nevada proposed extensions of Dream Chaser spaceplane technology. According to head of Sierra Nevada Space Systems Mark Sirangelo, the cost of completing the Dream Chaser should be less than $1 billion.
On April 18, 2011, NASA awarded nearly $270 million in funding for CCDev 2, including $80 million to Sierra Nevada Corporation for Dream Chaser. Since then, nearly a dozen further milestones have been completed under that Space Act Agreement. Some of these milestones included testing of the airfoil fin shape, integrated flight software and hardware, landing gear, and a full-scale captive carry flight test.
Commercial Crew integrated Capability
In December 2013, the German Aerospace Center (DLR) announced a funded study to investigate ways in which Europe might take advantage of the Dream Chaser crewed spaceplane technology. Named the DC4EU (Dream Chaser for European Utilization), the project will study using it for sending crews and cargo to the ISS and on missions not involving the ISS, particularly in orbits of substantially greater altitude than the ISS can reach.
In January 2014, the European Space Agency (ESA) agreed to be a partner on the DC4EU project, and will also investigate whether the Dream Chaser can use ESA avionics and docking mechanisms. ESA will also study launching options for the "Europeanized" Dream Chaser, particularly whether it can be launched within the Ariane 5's large aerodynamic cargo fairing – or, like the Atlas V, without it. In order to fit within the fairing, the Dream Chaser's wing length will have to be reduced slightly, which is thought to be easier than going through a full aerodynamic test program to evaluate and prove it along with the Ariane for flight without the fairing.
In late January 2014, it was announced that the Dream Chaser orbital test vehicle was under contract to be launched on an initial orbital test flight, using an Atlas V rocket, from Kennedy Space Center in November 2016. This is a privately arranged commercial agreement, and is funded directly by Sierra Nevada and is not a part of any existing NASA contract.
September 2014 CCtCap non-selection by NASA
After being involved with the NASA Commercial Crew Development program since 2009—and being selected as one of the contract award recipients in each prior phase of the program—NASA did not select the Dream Chaser for the next phase of the Commercial Crew Program announced September 16, 2014 due to lack of maturity. Sierra Nevada filed a protest to the US Government Accountability Office (GAO) on September 26. Boeing and SpaceX were asked by NASA to "stop work" on the crewed spacecraft during the protest resolution. However, on October 22, 2014, a Federal Judge ruled that NASA could proceed with contracts with Boeing and SpaceX to develop their "space taxis", while the GAO continued to consider Sierra Nevada's protest of NASA's original decision.
Two weeks after losing the Commercial Crew Transportation Capability (CCtCap) competition to SpaceX and Boeing on September 16, 2014, Sierra Nevada Corporation announced it has designed a launch system that combines a scale version of the company’s Dream Chaser space plane with the Stratolaunch Systems air launch system. Earlier the same week, Sierra Nevada introduced the "Dream Chaser Global Project" which would provide customized access to low Earth orbit to global customers.
Despite not being selected to continue forward under NASA’s Commercial Crew transportation Capability (CCtCap) phase of the effort to send crews to orbit via private companies, SNC is still completing milestones under earlier phases of the CCP. On December 2, 2014 SNC announced that it completed NASA’s CCiCap Milestone 5a related to propulsion risk reduction for the Dream Chaser space system.
By late December, details had emerged that "a high-ranking agency official"—"William Gerstenmaier, the agency’s top human exploration official and the one who made the final decision"—"opted to rank Boeing’s proposal higher than a previous panel of agency procurement experts." More specifically, Sierra Nevada asserted in their filings with the GAO that Gerstenmaier may have "overstepped his authority by unilaterally changing the scoring criteria."
On January 5, 2015, the GAO denied Sierra Nevada's CCtCap challenge, stating that NASA made the proper decision when it decided to award Boeing $4.2 billion and SpaceX $2.6 billion to develop their vehicles. Ralph White, the GAO's managing associate counsel, announced that NASA "recognized Boeing’s higher price but also considered Boeing’s proposal to be the strongest of all three proposals in terms of technical approach, management approach and past performance, and to offer the crew transportation system with most utility and highest value to the government." Furthermore, the agency found "several favorable features" in SNC's proposal "but ultimately concluded that SpaceX's lower price made it a better value."
Dream Chaser Global Project
In September 2014, SNC announced that it would, with global partners, use the Dream Chaser as the baseline spacecraft for orbital access for a variety of programs, specializing the craft as needed.
On November 5, 2014 during the Space Traffic Management Conference at Embry–Riddle Aeronautical University, SNC's Space Systems team presented the challenges and opportunities related to landing the Dream Chaser spacecraft at public-use airports. According to the presentation, "Unlike the Space Shuttle, the Dream Chaser does not require any unique landing aids or specialized equipment as it uses all non-toxic propellants and industry standard subsystems."
Stratolaunch and Dream Chaser
In late November 2014, Vulcan Aerospace released the results of the SNC/Stratolaunch space transportation architecture, which indicated that the reduced-size Dream Chaser in conjunction with the Stratolaunch-based launch system mission capabilities. The system would have an outbound range of 1,900 kilometers; 1,200 miles (1,000 nmi) away from the airport where the aircraft departed. The launch vehicle would be a modified air-launched Orbital Sciences rocket that is approximately 37 m (120 ft) in length. The Dream Chaser payload would be a 75-percent sized version of the vehicle previously proposed to NASA—while maintaining the relative outer mold line-6.9 m (22.5 ft) in length with a wingspan of 5.5 m (18.2 ft), which could carry 2 to 3 crewmembers plus a variety of scientific and research payloads.
Dream Chaser for European Utilization
In 2013, SNC and OHB entered into an agreement to study the feasibility of using SNC’s Dream Chaser spacecraft for a variety of missions. The DC4EU study thoroughly reviewed applications for the Dream Chaser including crewed and uncrewed flights to low-Earth orbit (LEO) for missions such as microgravity science, satellite servicing, and active debris removal (ADR).
On February 3, 2015, the Sierra Nevada Corporation’s (SNC) Space Systems and OHB System AG (OHB) in Germany announced the completion of the initial Dream Chaser for European Utilization (DC4EU) study.
According to Dr. Fritz Merkle, member of the Executive Management Board of OHB AG:
"The inherent design advantages of the Dream Chaser reusable lifting body spacecraft make it an ideal vehicle for a broad range of space applications. We partnered with SNC to study how the design of the Dream Chaser can be used to advance European interests in space. The study results confirm the viability of using the spacecraft for microgravity science and ADR. DC4EU can benefit the entire international space community with its unique capabilities. We look forward to further maturing our design with SNC as we expand our partnership."
The cooperation was renewed in April 2015 for additional two years.
United Nations missions
The United Nations Office for Outer Space Affairs (UNOOSA), which has never launched a space mission of its own, selected the cargo Dream Chaser for at least one mission for United Nations member states that have no space access or space programs of their own. The mission would last for at least two weeks in freeflight, to allow the payloads a microgravity environment, without docking with the International Space Station. The proposed mission would launch as soon as 2021.
Hubble Telescope service mission
Dream Chaser Cargo System
The cargo variant of the SNC Dream Chaser is called the Dream Chaser Cargo System. Featuring an expendable cargo portion, containing solar panels, the cargo version of the spacecraft will be capable of returning 1,750 kg (3,860 lb) to Earth, undergoing re-entry forces of 1.5G. It has been proposed for the Phase II program for cargo resupply of the International Space Station.
January 2016 CRS2 selection by NASA
In December 2014, Sierra Nevada proposed Dream Chaser for CRS-2 consideration. It is in competition with the existing CRS-1 contract holders SpaceX Dragon capsule and Orbital Sciences Cygnus capsule, as well as fellow CCDev competitor Boeing CST-100. In January 2016, NASA announced that Dream Chaser had been awarded one of the contracts under CRS2. NASA committed to purchasing a minimum of six resupply missions to the ISS from Sierra Nevada.
To meet CRS2 guidelines, the cargo Dream Chaser will feature foldable wings, to fit within a 5m cargo fairing, unlike the passenger Dream Chaser, which did not use a cargo fairing. The ability to fit in a cargo fairing allows launches from Ariane 5 as well as Atlas V rocket launcher vehicles. To expand the cargo uplift capacity, an expendable cargo module is affixed aft, which will not support downlift, but can be used for disposal of up to 3,250 kg (7,170 lb) of trash. Total uplift is planned for 5,000 kg (11,000 lb) pressurized, 500 kg (1,100 lb) unpressurized, with downlift of 1,750 kg (3,860 lb) wholly within the spaceplane.
Sierra Nevada completed an initial test phase on the Dream Chaser rocket engine in 2010, under the CCDev1 program, including three successful test firings on a single hybrid motor in a single day.
A second phase of testing began in June 2013, with a motor firing and ignition test in order to validate the newly modified test stand, as a start to the Commercial Crew Integrated Capability (CCiCap) contract test phase.
In 2014, Sierra Nevada completed its wind tunnel testing as part of its CCiCAP Milestone 8. The Wind tunnel testing involved analyzing the flight dynamics characteristics that the vehicle will experience during orbital ascent and re-entry. Wind tunnel testing was also completed for the Dream Chaser Atlas V integrated launch system. These tests were completed at NASA Ames Research Center at Moffett Field, California, CALSPAN Transonic Wind Tunnel in New York, and at NASA Langley Research Center Unitary Plan Wind Tunnel in Hampton, Virginia.
Flight test program
In May 2013, The Dream Chaser Engineering Test Article (ETA) was shipped to the Dryden Flight Research Center in California for a series of ground tests and aerodynamic flight tests. This move to Dryden came about a year after a captive carry test that was conducted near the Rocky Mountain Metropolitan Airport on May 29, 2012. During that test, an Erickson Skycrane was used to lift the Dream Chaser to better determine its aerodynamic properties. "The testing at Dryden will include tow, captive-carry and free-flight tests of the Dream Chaser. A truck will tow the vehicle down a runway to validate performance of the nose strut, brakes and tires. The captive-carry flights will further examine the loads the vehicle will encounter during flight and test the performance and flutter of the vehicle up to release from an Erickson Skycrane helicopter. The free-flight tests are designed to validate the Dream Chaser's aerodynamics as well as test the flight control surfaces to verify flight characteristics for approach, flare and landing." A second captive carry flight test was completed on August 22, 2013.
On October 26, 2013, the first free-flight occurred. The test vehicle was released from the "skycrane" helicopter, and flew the correct flightpath to touchdown less than a minute later. Just prior to landing, the left main landing gear failed to deploy resulting in a crash landing. In a press teleconference a short while later, Mark Sirangelo, corporate vice president of Sierra Nevada, told reporters that the view of the ETA was obscured by the dust as it skidded off the runway, but that the vehicle was found upright, with the crew compartment intact, and all systems inside still in working order. Sierra Nevada corporation engineers do not believe that the ETA flipped over.
On August 1, 2014, the first completed piece of the orbital test vehicle's composite airframe was unveiled at the Lockheed Martin Michoud Assembly Facility in Louisiana.
In October 2015, the thermal protection system was installed on the ETA for the next phase of atmospheric flight testing. The orbital cabin assembly of the FTA orbital test vehicle was also completed by contractor Lockheed Martin.
The first two Dream Chasers — the ETA and the Flight Test Article (FTA) — have been given internal and external names, with some sources reporting that the ETA will be named Eagle, while the FTA was originally named Ascalon before being changed to Ascension.
In 2014, an initial orbital test flight of the Dream Chaser orbital test vehicle was planned for November 1, 2016, launching on an Atlas V rocket from Kennedy Space Center Launch Complex 41. NASA indicated that the first commercial cargo flight by any provider under the CRS-2 contract will not occur until 2019.
On November 11, 2017, the Dream Chaser successfully completed a glide test, after being released from an altitude of 3,700 m and landing at Edwards AFB.
The cargo Dream Chaser has been selected by UNOOSA for the first United Nations space mission, to allow nations without access to space to fly microgravity experiments. There may be additional missions.
The following organizations have been named as technology partners:
- Aerojet – reaction control system technology
- AdamWorks – composites
- Boeing Phantom Works – construction of some early[which?] test articles[needs update]
- Charles Stark Draper Laboratory – guidance, navigation, and control
- Lockheed Martin – airframe construction and human rating of the spaceplane
- MDA – systems engineering
- University of Colorado – human-rating
Spacecraft of comparable role, configuration and era
- Dream Chaser Cargo System:
- Dream Chaser Space System:
- @jeff_foust (March 30, 2016). "Dream Chaser is launcher 'agnostic'" (Tweet) – via Twitter.
- "Dream Chaser Model Drops in at NASA Dryden" (Press release). Dryden Flight Research Center: NASA. December 17, 2010. Archived from the original on January 7, 2014. Retrieved August 29, 2012.
- Klingler, Dave (September 6, 2012). "50 years to orbit: Dream Chaser's crazy Cold War backstory: The reusable mini-spaceplane is back from the dead—again—and prepping for space". ars Technical. Boston: Conde Nast. p. 3. Archived from the original on January 6, 2014. Retrieved September 7, 2012.
- Doug Messier (May 24, 2014). "Virgin Galactic Hails RocketMotorTwo Milestone". ParabolicArc.
- Messier, Doug (August 19, 2014). "SNC Abandons Own Hybrid Motors on Dream Chaser". Parabolic Arc. Retrieved March 26, 2016.
- "NASA Deputy Administrator Lori Garver touts Colorado's role". Youtube.com. February 5, 2011. Retrieved August 29, 2012.
- Sirangelo, Mark (August 2011). "NewSpace 2011: Sierra Nevada Corporation". Spacevidcast. Retrieved August 16, 2011. Sirangelo, Mark (August 24, 2014). "Flight Plans and Crews for Commercial Dream Chaser's First Flights: One-on-One Interview With SNC VP Mark Sirangelo (Part 3)". AmericaSpace.
- "Moving Forward: Commercial Crew Development Building the Next Era in Spaceflight" (PDF). Rendezvous: Where today meets tomorrow. 4 (2): 10–15. Summer 2010. Archived (PDF) from the original on January 6, 2014. Retrieved January 6, 2014.
- "The Space Show : Mark Sirangelo interview". David Livingston. January 4, 2012. Retrieved January 7, 2012.
- Frank Morring, Jr (February 19, 2010). "Sierra Nevada Building On NASA Design". Aviation Week.[permanent dead link]
- Vitug, Eric (August 23, 2017). "Setting the Spaceplane Stage".
- Eddy, Max (April 2, 2012). "How the United States Will Return to Space". Geekosystem. New York. Retrieved January 6, 2014.
- "Evolution of the Dream Chaser".
- Hodges, Jim (Fall 2011). "The Dream Chaser: Back to the Future". ASK Magazine: The NASA Source for Project Management and Engineering Excellence (44). Washington, DC: Academy of Program/Project & Engineering Leadership NASA. Archived from the original on January 6, 2014. Retrieved November 16, 2013.
- Klingler, Dave (September 6, 2012). "50 years to orbit: Dream Chaser's crazy Cold War backstory: The reusable mini-spaceplane is back from the dead—again—and prepping for space". ars Technical. Boston: Conde Nast. p. 2. Archived from the original on January 6, 2014. Retrieved September 7, 2012.
- Dream Chaser Builds on Decades of Experience, source, Beforeitsnews
- Voss, Ed (June 24, 2011). "Sierra Nevada Space Systems Successfully Completes Two Major Nasa Human Space Flight Development Milestones" (Press release). Poway, California: Sierra Nevada Space Systems. Archived from the original on October 11, 2011.
- "Commercial Crew Development Industry Partners Continue Progress" (PDF). Retrieved August 29, 2012.
- "Next Spacex Cargo Demo Flight" (PDF). Retrieved August 29, 2012.
- "Sierra Nevada Corporation's Space Systems Delivers the Dream Chaser® First Flight Test Vehicle Structure, Completing a Major Milestone for NASA's Commercial Crew Program" (Press release). Archived from the original on April 8, 2013.
- "Sierra Nevada News & Press Releases". Sncorp.com. April 24, 2012. Archived from the original on November 27, 2012. Retrieved May 7, 2012.
- "SNC and NASA Langley announce Five Years of Partnership". Archived from the original on July 31, 2012.
- "Sierra Nevada Corporation Announces Successful Completion of Dream Chaser Cew Vehicle Nose Gear Landing Test". SNC. Archived from the original on August 7, 2012. Retrieved August 15, 2012.
- "Sierra Nevada Completes Dream Chaser Safety Review". May 10, 2013. Retrieved May 15, 2013.
- Rosenberg, Zach (January 30, 2013). "Lockheed to build second Dream Chaser airframe for Sierra Nevada". Flightglobal. Sutton, Surrey, UK. Archived from the original on January 7, 2014. Retrieved March 25, 2013.
- "Dream Chaser mini-shuttle given 2016 launch date". BBC News. January 24, 2014.
- Dean, James (January 30, 2013). "Sierra Nevada's Dream Chaser will get Lockheed Martin's help". Florida Today. Melbourne, Florida. Archived from the original on February 17, 2013. Retrieved February 11, 2013.
- Bolden, Jay (March 13, 2013). "NASA Astronaut Lee Archambault Leaving Agency". NASA. Retrieved March 25, 2013.
- "NASA Astronaut Lee Archambault Joins Sierra Nevada as Test Pilot". March 13, 2013. Retrieved March 25, 2013.
- "SNC's Hybrid Rocket Engines Power SpaceShipTwo on its First Powered Flight Test". April 29, 2013. Archived from the original on June 16, 2013. Retrieved May 15, 2013.
- Mewhinney, Michael. "NASA, SPACEDEV TO COLLABORATE ON FUTURE SPACE TRANSPORTATION". NASA Ames Research Center. NASA Ames Research Center. Retrieved 2016-01-15.
- Sirangelo, Mark (September 26, 2006). "SpaceDev Announces Founder James Benson Steps Down as Chairman and CTO; Benson Starts Independent Space Company to Market SpaceDev's Dream Chaser" (Press release). Poway, California: SpaceDev. Archived from the original on November 10, 2006.
- "SpaceDev and United Launch Alliance to Explore Launching the Dream Chaser(TM) Space Vehicle on an Atlas V Launch Vehicle" (Press release). Poway, California: SpaceDev. Market Wire. April 10, 2007. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- "NASA Signs Commercial Space Transportation Agreements". NASA. June 18, 2007. Retrieved August 16, 2011.
- Fikes, Bradley J. (October 21, 2008). "SpaceDev agrees to be acquired". U-T San Diego. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- "SNC receives largest award of NASA's CCDev Competitive Contract". SNC. February 1, 2010. Archived from the original on February 7, 2010.
- "Text of Space Act Agreement" (PDF).
- "Commercial Crew: Sierra Nevada". NASA. Retrieved July 25, 2012.
- "Dream Chaser Model Drops in at NASA Dryden". NASA.
- Chang, Kenneth (February 1, 2011). "Businesses Take Flight, With Help From NASA". New York Times. p. D1. Archived from the original on January 6, 2014. Retrieved August 29, 2012.
- "Sierra Nevada Space Systems Adds Key Former Nasa Leaders to Its Dream Chaser Orbital Space Vehicle Team" (Press release). Louisville, Colorado. July 5, 2011. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- Dean, James. "NASA awards $270 million for commercial crew efforts" Archived April 19, 2011, at the Wayback Machine.. space.com, April 18, 2011.
- "Sierra nevada corporation's dream chaser space system passes preliminary design review". SNC Release. June 6, 2012. Archived from the original on August 13, 2012.
- "Sierra nevada corporation begins flight test program of the dream chaser orbital crew vehicle". SNC Release. May 30, 2012. Archived from the original on August 13, 2012.
- "Boeing, SpaceX and Sierra Nevada Win CCiCAP Awards". spacenews.com, August 3, 2012.
- Messier, Doug (December 16, 2013). "German Space Agency Funds Study on Uses of Sierra Nevada's Dream Chaser". Parabolic Arc. Mojave, California. Archived from the original on January 6, 2014. Retrieved December 16, 2013.
- Clark, Stephen (January 8, 2014). "Europe eyes cooperation on Dream Chaser space plane". Spaceflight Now. Archived from the original on January 9, 2014. Retrieved January 9, 2014.
- Schierholz, Stephanie; Martin, Stephanie (September 16, 2014). "NASA Chooses American Companies to Transport U.S. Astronauts to International Space Station". www.nasa.gov. Retrieved September 17, 2014.
- Norris, Guy. "Why NASA Rejected Sierra Nevada's Commercial Crew Vehicle" Aviation Week & Space Technology, October 11, 2014. Accessed: 2014-10-13. Archived on October 13, 2014
- Keeney, Laura (October 3, 2014). "So Sierra Nevada protested NASA space-taxi contract, but what's next?". Denver Post. Retrieved October 5, 2014.
- Browne, Clayton. "NASA Wins; Boeing and Space X Shuttle Contracts Ruled Valid". ValueWalk. Retrieved 2016-01-15.
- "NASA Chooses American Companies to Transport U.S. Astronauts to International Space Station". NASA. September 16, 2014. Retrieved 2014-09-18.
- "Sierra Nevada and Stratolaunch Team Up on Dream Chaser Space Plane". NBC News. October 1, 2014. Retrieved 2014-10-01.
- "Sierra Nevada Corporation Introduces Dream Chaser Global Project Spaceflight Program Sept. 30". SpaceRef. December 29, 2014. Retrieved 2014-09-29.
- "Sierra Nevada completes Dream Chaser's milestone 15a for prior phase of Commercial Crew". Spaceflight Insider. December 3, 2014. Retrieved December 3, 2014.
- "SNC Tests Dream Chaser Propulsion System". NASA Blog blogs.nasa.gov. December 2, 2014. Retrieved December 2, 2014.
- Messier, Doug (December 23, 2014). "Sierra Nevada Alleges Boeing Benefitted From Commercial Crew Criteria Changes". Parabolic Arc. Retrieved December 25, 2014.
- Davenport, Christian. "GAO denies Sierra Nevada's legal challenge to NASA space contract". Washington Post. Retrieved January 5, 2015.
- "Sierra Nevada Corporation to Introduce Dream Chaser® Global Project Spaceflight Program Sept. 30". SNC. September 29, 2014.
- "Sierra Nevada Corporation to Present Progress on Evaluating Dream Chaser Landing at Public Use Airports". WFXS FOX55 WAUSAU. November 5, 2014. Archived from the original on November 7, 2014. Retrieved November 1, 2014.
- "Challenges and Opportunities Related to Landing the Dream Chaser® Commercial Reusable Space Vehicle at a Public-Use Airport". ERAU Scholarly Commons. November 5, 2014. Retrieved November 1, 2014.
- Gebhardt, Chris (November 26, 2014). "SNC, Stratolaunch expand on proposed Dream Chaser flights". NASASpaceFlight.com. Retrieved November 27, 2014.
- Completion of the initial DC4EU study (March 2, 2015). "http://www.sncorp.com/AboutUs/NewsDetails/749"
- de Selding, Peter B. (2015-04-17). "DLR Renews Cooperation with SNC on Dream Chaser". Space News. Retrieved 2015-04-21.
- Robin Seemangal (3 October 2016). "Dream Chaser: The Spacecraft That Will Transform Humanity's Access to Space". The Observer (New York).
- Jay Bennett (14 February 2017). "A New Spaceship Could Fly Astronauts to the Hubble Space Telescope for Repairs". Popular Mechanics.
- "Sierra Nevada Hopes Dream Chaser Finds "Sweet Spot" of ISS Cargo Competition". SpaceNews. Retrieved February 20, 2016.
- Jeff Foust (March 13, 2015). "Lockheed Martin Pitches Reusable Tug for Space Station Resupply". Space News.
- Christian Davenport (February 13, 2015). "Grounded: Left behind in the contracting race to restore Americans to space". The Washington Post.
- Dan Leone (January 24, 2015). "Weather Sat, CRS-2 Top U.S. Civil Space Procurement Agenda for 2015". SpaceNews.com.
- "NASA Awards International Space Station Cargo Transport Contracts". NASA News. January 12, 2016. Retrieved January 15, 2016.
- Jeff Foust (March 17, 2015). "Sierra Nevada Hopes Dream Chaser Finds "Sweet Spot" of ISS Cargo Competition". Space News.
- "Sierra Nevada Corporation Begins Dream Chaser Main Hybrid Rocket Motor Testing". NewSpace Watch. June 6, 2013. Retrieved June 11, 2013. (Subscription required (. ))
- "Dream Chaser passes Wind Tunnel tests for CCiCap Milestone". NASASpaceflight.com. May 19, 2014. Retrieved 2015-01-02.
- Bergin, Chris (May 12, 2013). "Dream Chaser ETA heads to Dryden for drop tests". NasaSpaceFlight.com. Archived from the original on January 6, 2014. Retrieved May 14, 2013.
- "Sierra Nevada's Dream Chaser spacecraft tested at Broomfield airport". dailycamera.com. May 29, 2012. Retrieved May 29, 2012.
- Lindsey, Clark (May 14, 2013). "More about SNC preparations for drop tests of Dream Chaser prototype". NewSpace Watch. Retrieved May 14, 2013. (Subscription required (. ))
- Wall, Mike (August 26, 2013). "Dream Chaser space plane dangles from helicopter for second flight test". NBC News. New York. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- Bergin, Chris (October 26, 2013). "Dream Chaser suffers landing gear failure after first flight". NASA Spaceflight. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- Harwood, William (October 29, 2013). "Sierra Nevada investigates Dream Chaser landing mishap". CBS News. New York. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- David, Leonard (October 29, 2013). "Private Dream Chaser Space Plane Skids Off Runway After Milestone Test Flight (Video)". Space.com. New York. Archived from the original on January 6, 2014. Retrieved January 6, 2014.
- "First Piece of Private Dream Chaser Space Plane Unveiled". Space.com. August 6, 2014.
- "Dream Chaser preps for 2nd free-flight test and first orbital test". Space Daily. October 9, 2015.
- "Dream Chaser still fighting for her place in space". www.nasaspaceflight.com. October 6, 2015.
- Dream Chaser's First Launch Will Fly to ISS, SNC Outlines Testing and Development Plans Ahead. Mike Killian, January 15, 2016.
- Kenneth Chang (2017-11-11). "Dream Chaser Space Plane Aces Glide Test - The New York Times". Retrieved 2017-11-15.
|Wikimedia Commons has media related to Dream Chaser.|