the TR3-B 'Astra' is a large triangular anti-gravity craft within the U.S. fleet. Black projects defense industry insider Edgar Rothschild Fouche wrote about the existence of the TR3-B in his book, Alien Rapture.
The TR3-B does not depend solely or principally on its hydrogen-oxygen rockets. It is a highly reduced-gravity aerospace craft manufactured in secret "black programs" by Humans. The antigravity field produced reduces the vehicles weight by about 90% so that very little thrust is required to either keep it aloft or to propel it at Mach 9 speeds, or higher.
The TR-3B vehicle's outer coating is electro-chemical reactive and changes with electrical RF Radar stimulation and can change reflectiveness, radar absorptiveness, and color. This is also the first US vehicle to use quasi-crystals in the vehicle's skin. This polymer skin, when used in conjunction with the TR-3Bs Electronic Counter Measures and, ECCM, can make the vehicle look like a small aircraft, or a flying cylinder - or even trick radar receivers into falsely detecting a variety of aircraft, no aircraft, or several aircraft at various locations.
A circular, plasma filled accelerator ring called the Magnetic Field Disrupter, surrounds the rotable crew compartment and is far ahead of any imaginable technology. Sandia and Livermore laboratories developed the reverse engineered MFD technology. The plasma, mercury based, is pressurized at 250,000 atmospheres at a temperature of 150 degrees Kelvin, and accelerated to 50,000 rpm to create a super-conductive plasma with the resulting gravity disruption [reduction of almost all of the pull of gravity and effects of inertia].
The MFD generates a magnetic vortex field, which disrupts or neutralizes the effects of gravity on mass within proximity, by 89 percent. The MFD creates a disruption of the Earth's gravitational field upon the mass within the circular accelerator. The mass of the circular accelerator and all mass within the accelerator, such as the crew capsule, avionics, MFD systems, fuels, crew environmental systems, and the nuclear reactor, are reduced by 89%. The current MFD in the TR-3B causes the effect of making the vehicle extremely light, and able to outperform and outmaneuver any craft yet constructed - except, of course, those back-engineered total-antigravity craft which the government does not admit exist. To see the 13 known antigravity craft of US manufacture
The TR-3B is a high altitude, stealth, reconnaissance platform with an indefinite loiter time. Once you get it up there at speed, it doesn't take much propulsion to maintain altitude.
With the vehicle mass reduced by 89% the craft can travel at Mach 9, vertically or horizontally. My sources say the performance is limited only the stresses that the human pilots can endure. Which is a lot, really, considering along with the 89% reduction in mass, the G forces are also reduced by 89%. The crew of the TR-3B should be able to comfortable take up to 40Gs.
The TR-3Bs propulsion is provided by 3 multimode thrusters mounted at each bottom corner of the triangular platform. The TR-3 is a sub-Mach 9 vehicle until it reaches altitudes above l20,000 feet - then who knows how fast it can go!
The reactor heats the liquid hydrogen and injects liquid oxygen in the supersonic nozzle, so that the hydrogen burns concurrently in the liquid oxygen afterburner. The multimode propulsion system can operate in the atmosphere, with thrust provided by the nuclear reactor, in the upper atmosphere, with hydrogen propulsion, and in orbit, with the combined hydrogen/oxygen propulsion. The engines are reportedly built by Rockwell.