The new owners still expect to use Roc for air launch, but the current focus is on using the plane as a testbed for Stratolaunch’s hypersonic flight vehicles, Once the plane is cleared for regular operations, perhaps next year, Stratolaunch could begin launching its Talon-A prototype hypersonic plane. David Millman, Stratolaunch’s chief technology officer, said the company plans to build three hypersonic vehicles. He said that should open the way for conducting hypersonic tests at least once every 17 days, matching the tempo of flights for the X-15 rocket plane in the 1960s,
Hypersonic flight at five times the speed of sound is a big deal for military applications. Russia and China are said to be working on hypersonic weapons systems, and the U.S. military is keen to keep up. Stratolaunch expects its technology to figure in the Pentagon’s plans. “That’s exactly one of the areas that we’re looking at: how can we help the Department of Defense in mitigating risks for all their extensive flight testing,” Millman told GeekWire.
Millman said Stratolaunch’s Talon testbed will be able to carry payloads, test materials and fly a variety of profiles that can help the Pentagon determine characteristics of hypersonic flight before it conducts costly full-blown flights of its own hypersonic vehicles. “What we’re doing is providing a path or them to test a lot of their technologies in a simpler way, in a repeatable way, in a useful way so that they can get to their all-up rounds much quicker,” Millman said.
Stratolaunch hasn’t ruled out eventually pursuing other applications for its launch system, including sending satellite payloads and crewed space planes into orbit. Other companies, principally including Virgin Orbit, are also working on next-generation air launch technology. Such systems hold the promise of greater versatility and quicker response time for launching payloads, due to the fact that the carrier planes can take off from a wide variety of runways, fly around inclement weather and theoretically launch their payloads in any desired orbital inclination.
Stratolaunch’s twin-fuselage, six-engine Roc airplane is in a class by itself, thanks to its world-record wingspan of 385 feet. In comparison, the wingspan of the modified Boeing 747 that Virgin Orbit is using comes to 211 feet. The previous record-holder was the Spruce Goose, a prototype seaplane that made its debut in 1947 and had a 320-foot wingspan. Built by Mojave-based Scaled Composites, Roc has the capacity to carry more than 500,000 pounds of payload.