world of aviation logo

World’s largest aircraft completes 3rd test flight

written by Adam Thorn | January 17, 2022

The world’s largest aircraft, Roc, completing a test flight in the Mojave Desert.

The world’s largest aircraft, Roc, completed its third test flight on Sunday over the Mojave Desert in California.

Stratolaunch said the team tested its left main landing gear, which provided potential options for landing it in the event the hardware didn’t perform as expected.

The distinctive-looking twin-fuselage Roc is the brainchild of late Microsoft co-founder Paul Allen, and is designed to carry a rocket-powered, hypersonic vehicle underneath that can reach speeds above Mach 5.

During its latest test flight, the aircraft flew for more than four hours, reached an altitude of 7,160 metres and an indicative airspeed of 180 knots.

Stratolaunch president Dr. Zachary Krevor said, “Today’s successful flight demonstrates and validates improvements to the carrier aircraft’s systems and overall flight performance.

“We will take the data we gathered today and continue to advance the aircraft’s operational performance to support hypersonic testing in 2022.

“Testing the left main landing gear individually mitigated risk and provided our aircrew with options for landing the aircraft in the event the hardware didn’t perform as expected.”


Roc is designed to eventually carry the rocket-powered and automated Talon-A vehicles into the upper atmosphere.

The first two of these, TA-0 and TA-1, completed its initial power-on testing in late December 2021, and is due to begin hypersonic flight testing in 2022. Stratolaunch is targeting delivery to customers as early as next year and if all goes well, the aircraft will carry payloads for customers into low-Earth orbit.

World of Aviation reported how Roc completed its first flight back in 2019.

The test pilots performed a variety of flight control manoeuvres to calibrate speed and test flight control systems. These included roll doublets, yawing manoeuvres, pushovers and pull-ups, and steady heading side slips.

The all-composite aircraft has a payload capacity of 500,000 pounds (245,000 kilograms), is powered by six Pratt & Whitney PW4056 turbofans, and has a 385-foot wingspan and two 238-foot fuselages.

While Allen was one of the driving forces behind the Stratolaunch, he was not there to witness the first flight milestone, having died in October 2018 due to cancer. He was 65 years of age.


Each day, our subscribers are more informed with the right information.

SIGN UP to the Australian Aviation magazine for high-quality news and features for just $99.95 per year