Stratolaunch's huge Roc carrier plane flies higher than ever on 7th test flight

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Roc flew for more than three hours yesterday (June 16) and broke its own altitude record.

The Stratolaunch Roc carrier plane during its seventh test flight June 16, 2022.
Stratolaunch's giant carrier plane, called Roc, flew higher than ever before during its seventh test flight on June 16, 2022. (Image credit: Stratolaunch)

Stratolaunch's enormous Roc carrier aircraft aced its seventh test flight yesterday (June 16), flying higher than it ever has before.

Roc, which will eventually carry into the sky hypersonic vehicles developed by Stratolaunch, reached a maximum altitude of 27,000 feet (8,200 meters) yesterday during a flight over the Mojave Desert in California that lasted three hours and one minute .

"The seventh flight focused on continuing Roc's flight envelope expansion with the recent addition of the pylon on the aircraft's center wing," Stratolaunch representatives said in a statement yesterday. (The pylon is the attachment point for hypersonic vehicles Roc will haul aloft.)

Other major objectives met on the flight included reviewing the aircraft's performance, handling and landing gear, the company said.

Related: Stratolaunch test photos: The world's largest plane in action

Yesterday's flight came just a week after Roc's sixth sortie, which ended early after Stratolaunch noticed "unexpected results." The company has not yet specified what those results were.

The massive airplane, which has a wingspan of 385 feet (117 m), is designed to release payloads high in the sky for purposes like hypersonic flight. One such payload is Talon-A, Stratolaunch's 28-foot-long (8.5 m) hypersonic vehicle prototype. Talon-A is designed to fly as fast as Mach 6, or six times the speed of sound.

Related stories:

— Stratolaunch flies world's largest airplane on 2nd test flight
— Stratolaunch to launch hypersonic vehicles from world's biggest airplane
— Stratolaunch starts building Talon hypersonic plane for Mach 6 flights

Stratolaunch plans to continue developing Talon-A for hypersonic missions, with operational flights scheduled to begin in 2023, if all goes according to plan. In its most recent release, the company said that the program to get Talon-A ready is making good progress.

"The company is also making solid progress on system integration of its first hypersonic flight test vehicle, TA-1, and on the fabrication of a third vehicle, TA-2, the first fully reusable hypersonic test vehicle," Stratolaunch representatives wrote.

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Elizabeth Howell
Elizabeth Howell
Former Staff Writer, Spaceflight (July 2022-November 2024)

Elizabeth Howell (she/her), Ph.D., was a staff writer in the spaceflight channel between 2022 and 2024 specializing in Canadian space news. She was contributing writer for Space.com for 10 years from 2012 to 2024. Elizabeth's reporting includes multiple exclusives with the White House, leading world coverage about a lost-and-found space tomato on the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?" (ECW Press, 2022) is co-written with astronaut Dave Williams.