China's Spaceplane Program Making Hypersonic Strides

Moreover,
asia times reported in september 2022
about the completion of China's Sichuan-based free-piston driven hypersonic shock tunnel, currently the largest facility of its type worldwide.

It can simulate extreme flight conditions up to Mach 33, or 2.5 to 11.5 kilometers per second. The facility has a diameter of 80 centimeters, twice the size of the X3 Expansion Tube at the University of Queensland in Australia, which was previously the largest facility of its kind.

As with the JF-22, the Sichuan-based facility can provide ground testing support for developing hypersonic vehicles such as scramjet-powered aircraft by simulating the escape velocity from Earth's atmosphere. At the same time, it can contribute to other types of missions, such as putting Chinese astronauts on the moon.

However, that type of hypersonic test facility is limited by its short simulation length, which lasts only a thousandth of a second, which is too short for some experiments. The new facility is thus expected to work with other wind tunnels to overcome that limitation.

China's J-22 and Sichuan-based free-piston driven hypersonic shock tunnel will both be instrumental in China's spaceplane, which may be built as a multi-mission platform and serve as the basis for future space weapons.

asia times reported in may 2023
on the successful return of China's Shenlong mini spaceplane, which touched down in the Gobi Desert after 276 days in orbit after being launched in August of the previous year. While Shenlong's flight was much shorter than the US X-37B, which spent 908 days in orbit, it was still a major milestone for China's space program.

Since its August 2022 launch, China's Shenlong mini spaceplane has conducted multiple large maneuvers that have raised its altitude and demonstrated formation flying.

It appears to be self-propelled in two or three docking or capture missions. China's Shenlong and its successor designs may also launch satellites into orbit, conduct reconnaissance missions and perform military tasks.

A reusable mass satellite launch platform is critical to establishing satellite constellations, which major world powers increasingly view as a strategic asset. China's spaceplane mothership is thus a vital reusable launch platform.

This month, The
wall street journal (wsj) reported
on the race between China and the US to find ways to cheaply and efficiently launch low-earth orbit (LEO) satellites, which are the building blocks of satellite constellations for high-speed broadband internet access.

WSJ noted that 360 million people in China still lack internet access, with LEO satellites viewed as an ideal solution to provide internet access in remote areas. The report also notes that reusable satellite launch vehicles can save significant sums on launch costs for building satellite constellations.

WSJ also noted that China plans to build 7,808 LEO broadband internet satellites, but no enterprise in China has as of yet created a reusable launch platform like SpaceX's Falcon 9. However, China's Shenlong spaceplane and similar designs may serve as reusable mass satellite launch platform options.

Hypersonic test facilities may also be vital for developing advanced reconnaissance drones that can fly at supersonic and hypersonic speeds to evade enemy air defenses.

in april 2023, asia times reported on China's rocket-powered supersonic WZ-8 drone, a cutting-edge reconnaissance system that can gather real-time mapping data to inform strategy or pre-determine missile strike targets in preparation for a future conflict. Leaked documents have shown the flight paths for WZ-8 missions over Taiwanese and South Korean airspace.

In addition to being a reusable mass satellite launch platform and high-speed reconnaissance asset, China's spaceplane mothership design may also serve as a fractional orbital bombardment platform (FOBS).

Ritwik Gupta notes
in a june 2023 article for the bulletin of the atomic scientists
that FOBS is a payload delivered into LEO and then re-enters the atmosphere to bombard a target before completing a full orbit.

Gupta notes that a FOBS has several advantages over traditional ballistic missiles, including global range, the ability to launch attacks from multiple directions and a shorter flight time versus intercontinental ballistic missiles (ICBMs).

He writes that while the Soviet Union created FOBS in the 1960s, they were less accurate than ICBMs, their time-to-target advantage was neutralized by enhanced US space-based detection and their use was explicitly prohibited by the Strategic Arms Limitation Talks II (SALT II).

However, Gupta says combining hypersonic weapons technology with FOBS can solve the latter's limitations, as hypersonic weapons can maneuver to fine tune their final approach to their targets and LEO is increasingly accessible through smaller space payloads.

The combination would also appear to exploit a loophole in SALT II forbidding the installation of any nuclear weapons or weapons of mass destruction in“orbit around the Earth.”

in october 2021, financial times reported
that China may have tested such a weapon in August of that year, with the Chinese military launching a rocket that then launched a hypersonic glide vehicle (HGV) that circled the Earth in LEO before cruising to its target.