World’s Largest Plane Pulls Off Its Latest Hypersonic Flight Test

Mammoth ‘Roc’ aircraft flew over the Mojave desert for its fifth test flight

The world’s largest aircraft successfully completed its fifth flight test as it comes closer to fulfilling its role of carrying and releasing hypersonic vehicles.

The mammoth  Roc aircraft constructed by private aerospace firm Stratolaunch flew for 4 hours and 58 minutes over the Mojave Desert and reached an altitude of 22,500 feet (6858 meters).

In a statement, Stratolaunch said the fifth flight debuted a new pylon on the aircraft’s center wing that will be used to carry and release Talon-A hypersonic vehicles.

The hardware is comprised of a mini-wing and adapter that is constructed with aluminum and carbon fiber skins. It weighs approximately 8,000 pounds and occupies 14 feet of Roc’s 95-foot center wingspan, allowing for adequate space between the aircraft’s dual fuselages for safe vehicle release and launch.

The state-of-the-art structure also features a winch system that will load Talon onto the platform from the ground, expediting launch preparation and reducing the need for ground support.

Talon-A vehicles are rocket-powered, autonomous, reusable testbeds carrying customizable payloads at speeds above Mach 5. This testbed capability enables routine access to the hypersonic flight environment, which is critical for scientific research, technological development, and component demonstration.

Initial results from Wednesday’s test objectives include validation of the aircraft’s general performance and handling characteristics, with the addition of the recently installed pylon hardware
The test was also conducted to continue validating landing gear operations including door functionality, and alternate gear extension

“Today’s successful flight validates important hardware improvements to the carrier aircraft,” said Dr. Zachary Krevor, Stratolaunch Chief Executive Officer and President.

“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. It is through their dedication that we continue to make steady progress toward achieving our next milestones of Talon-A flight tests later this year,” Krevor said in a media release.

In addition to testing the carrier aircraft, the team continues to make progress on system integration and functional testing of two Talon-A test vehicles, TA-0 and TA-1.

The team has also started fabrication of a third vehicle, TA-2, the first fully reusable hypersonic test vehicle. The company anticipates beginning hypersonic flight testing and delivering services to government and commercial customers in 2023.

Following a change in ownership and purpose, the six-engine jet with the world’s largest wingspan took off from Mojave Air and Space Port three years after its inaugural flight.

The twin-fuselage aircraft, dubbed Roc, has a total wingspan of 385 feet. It was created by Microsoft co-founder Paul G. Allen, who passed away just months before the inaugural flight in April 2019.

The Pentagon stated in December of last year that it had reached an agreement with Stratolaunch to test new hypersonic aircraft technologies. That transaction was a big component of Stratolaunch’s turnaround after it was apparently on the verge of bankruptcy until a change in ownership in 2019.


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JM Agreda
JM Agreda
JM Agreda is a freelance journalist for more than 12 years. He has published stories in various publications, research journals, and news websites. He mainly covers business, information technology, science, transportation, and politics.

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