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Hypersonic versus Quasi-Ballistic: Two Trajectories, Two Challenges

A true hypersonic cruise missile uses an atmospheric jet engine (ramjet or scramjet) that allows it to fly at low altitudes at speeds exceeding Mach 5, with high maneuverability. Its trajectory is relatively flat and can change direction, which makes interception extremely difficult. Missile defenses were historically designed for predictable ballistic trajectories—hypersonic cruise missiles have changed this paradigm.

A quasi-ballistic missile, on the other hand, uses a solid-propellant rocket engine and follows a trajectory that combines a conventional ballistic ascent phase with a phase of gliding and high-speed atmospheric maneuvers. It is more predictable than a true hypersonic cruise missile, but still fast and maneuverable enough to pose serious challenges to defense systems. The key distinction for defense operators: a quasi-ballistic trajectory can be calculated more precisely, allowing for the preparation of an interception.

The evidence gathered by Hinz—a technical convergence

Hinz’s argument rests on several pillars. First, the absence of an air intake: available images and videos of the Zircon, as well as photographs of debris, show a tubular composite-fiber structure for the propellant, with no visible sign of an air intake. However, any atmospheric jet engine requires an air intake—without it, it cannot function. Second, a 2023 Russian decree awarded the title of Hero of Labor to Yuri Milekhin, director of the Soyuz Federal Bimodal Center, for his role in developing an innovative high-energy solid propellant for the Zircon missile. Solid propellant is characteristic of ballistic missiles, not hypersonic cruise missiles.

Third, patents filed by NPO Mashinostroyeniya include, as early as 1999, a patent for a two-stage solid-propellant anti-ship missile with a quasi-ballistic trajectory, and in 2011, a patent for a maneuvering system capable of operating at supersonic and hypersonic speeds at high altitudes. These patents predate the first reports on the Zircon and suggest that the missile is the culmination of research on quasi-ballistic missiles, not on hypersonic cruise missiles.


A Russian decree honoring a solid-propellant specialist for his contribution to the Zircon. A 1999 patent on a quasi-ballistic anti-ship missile. Debris with no air intake. The evidence is piling up like pieces of a puzzle that Putin would prefer to keep scattered. Open-source research debunks Russian military propaganda using tools that the Kremlin cannot fully censor.

This content was created with the help of AI.

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