GLL-31 VII-AS
The GLL-31 project to establish an ongoing program GELA hypersonic flying laboratory GLL-31 (also VII-AS, but quite different from the HFL-VK), which was built in cooperation LII Gromov, TMKB Soyuz, MKB Fakel and other Russian companies and scientific research institutions. This is an experimental body for research rocket and ramjet propulsion systems for hypersonic speeds. The basis of the propulsion unit is a rocket engine with solid fuel taken from the missile 40N6 used by anti-aircraft sets S-300PMU Favorit and S-400 Triumf. The sides of the body are two fixed Ramjet supersonic combustion (scramjet) on liquid hydrogen.
The GLL-31 carrier machine is MiG-31D, which flew at speeds around Mach 2. The rocket engine with a running time of 30-60 seconds will speed up the body to speed about Mach 4, when the hydrogen scramjet run with a running time of 10-15 seconds. During the tests it achieved speeds of over Mach 5, but the goal is to limit Mach 10. The GLL-31 service ceiling is 40 km, the length is measured 8.05 meters and load-bearing surfaces have aspan of 3.045 m. Thetotal mass of 3800 kg. There are known two different versions GLL-31; The first was presented at the MAKS Air Show 2001 and the second at MAKS 2003.
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