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Giant leap in race to replace space shuttle? Dream Chaser gets big boost.

Sierra Nevada Corp., which is designing a mini space shuttle called the Dream Chaser, announced that it's joining forces with Lockheed Martin – heavy-hitter in aerospace.

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Compared with the other two contenders' craft, Dream Chaser's design is unique. While Boeing and SpaceX are developing capsules, Dream Chaser is, in effect, a mini space shuttle, winged for a pilot-controlled landing at runways such as the one the shuttle used at the Kennedy Space Center. The craft is designed to carry up to seven people, including the flight crew, as well as cargo.

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Within the next six to eight months, the company plans to conduct its first flight tests at NASA's Dryden Flight Research Center in Palmdale, Calif. The craft will be released from beneath a helicopter, then fly and land without human guidance.

The initial test is just to make sure the design can fly, says Jim Voss, a former NASA astronaut and vice president of the company's space-exploration systems division. The typical flight time will run from 30 to 40 seconds. Several more tests will be conducted, with different maneuvers added to each test, to take the full measure of its aerodynamic traits.

"We're starting a flight program, we are now starting to think about how to operate the system, how to create a transportation regime to low-Earth orbit and how to build multiple vehicles – all the things necessary to fly and fly within the next few years," says Mr. Sirangelo, adding that the new alliance with Lockheed will help Sierra Nevada meet its targets going forward.

SpaceX, based in Hawthorne, Calif., is working on a variant of its Dragon capsule. The capsule has made two cargo trips to the International Space Station so far, and is slated for two more this year under a cargo contract with NASA through at least 2015. The crewed version of Dragon would use rocket motors during the final moments of descent for a soft landing on Earth at mission's end. It would also include an escape system that could be used if a launch was aborted shortly after liftoff. The company has said it plans to test the escape system on the launch pad as early as next December.

The other entrant, Boeing, has teamed up with Bigelow Aerospace on another capsule-based approach to crew transportation that would also be expected to use the Atlas V as the launch vehicle.

Under NASA's contracts with the three companies, they receive incremental payments that are issued as they successfully meet agreed-upon milestones. If all three meet their milestones for the current contracts, NASA will have invested $1.5 billion in developing a commercial-crew capability for the US since 2009.

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