World’s Largest Plane Pulls Off Its Latest Flight Test


The vehicle tested out its hypersonic capabilities during its fifth flight.

The vehicle tested out its hypersonic capabilities during its fifth flight.
Image: Stratolaunch

The biggest airplane ever built just flew over the Mojave desert for its fifth test flight, inching closer to fulfilling its role of carrying and releasing hypersonic vehicles.

Private aerospace company Stratolaunch tested the carrier aircraft on Wednesday and is currently analyzing the data gathered during the test flight, according to a company press release. It’s the fifth flight of the gigantic vehicle since tests started three years ago.

Roc, named after the giant bird in ancient Middle Eastern mythology, flew for a total of 4 hours and 58 minutes, reaching an altitude of 22,500 feet (6,858 meters). For this flight, the team behind the airplane tested out a new pylon on the plane’s center wing that’s designed to carry hypersonic vehicles into the air (hypersonic refers to vehicles or missiles capable of traveling faster than Mach 5). The pylon, which measures 14 feet (4.3 meters) in length, should eventually carry the company’s reusable hypersonic test aircraft, known as Talon-A.

Stratolaunch was founded by Microsoft co-founder Paul Allen, who died a year before Roc took off for the first time in 2019. When Stratolaunch was first established, the company’s initial goal was to fly the very large plane to a high altitude from where it would launch the Orbital ATK’s Pegasus XL rocket into space (similar to how Virgin Galactic’s SpaceShipTwo currently works). Following Allen’s death, however, Stratolaunch switched its focus to developing, deploying, and flying hypersonic vehicles instead, setting low Earth orbit aside.

Last year, the company resurrected its rocket-powered hypersonic vehicle concept, which was part of Allen’s original vision for the company. Stratolaunch announced that it was planning to develop a larger hypersonic vehicle, dubbed Talon-Z, and a spaceplane nicknamed Black Ice that would carry payloads—and possibly passengers—to Earth orbit.

In December, Stratolaunch announced a contract with the Pentagon’s Missile Defense Agency to provide a testbed for developing defense strategies against hypersonic threats. Stratolaunch is seeking to mimic these missile threats with its hypersonic vehicles.

The U.S. government, worried about missile threats from China and Russia, has sought to amp its hypersonic weapons system and step-up its defense game. As hypersonic vehicles travel at high speeds, they are hard to detect, making it difficult for defenders to issue warnings prior to an attack. The latest test with Roc marks an important step forward for Stratolaunch and its partners.

“Today’s successful flight validates important hardware improvements to the carrier aircraft,” Zachary Krevor, Stratolaunch chief executive officer and president, said in a statement. “The pylon is a crucial component of our combined launch system, and I am proud of the team’s timely and quality integration work that occurred since our last test flight.” Stratolaunch is hoping to begin testing the Talon-A hypersonic vehicles later this year, according to Krevor.

The carrier aircraft weighs about 250 tons and boasts a wingspan that stretches 385 feet (117 meters) across. To me, Roc gives the impression of two planes huddled together in synchronized flight. The machine packs six 747 jet engines, rolls on 26 wheels, and can carry up to 125 tons of fuel. To gear itself up for take off, the plane needs to move through 12,000 feet on the runway. Stratolaunch expects to begin tests of its hypersonic vehicles in 2023.


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