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Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
The M21 sniper weapon system (SWS) in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle. [7] The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle. [8]
The TQ-11 (Chinese: 天鹊-11; pinyin: Tiānquè-11, lit. Sky Lark 11) is a gas-generator cycle rocket engine burning liquid methane and liquid oxygen developed by LandSpace. It is used as the second stage vernier engine for LandSpace's ZQ-2 rocket. [2] [3] [4] The engine produces 80 kilonewtons (18,000 lbf) of thrust in a vacuum. [1]
The M-LOK rail specification included metric dimensions instead of imperial, and utilizes a T-slot nut capable of only 90-degree rotation, reinforced by thread-locking fluid, making it suited for applications on free-floating handguards. It was designed to work with both metal and polymer parts.
The nozzle dimensions are calculated to maintain a design chamber pressure, while producing thrust from the exhaust gases. Once ignited, a simple solid rocket motor cannot be shut off, as it contains all the ingredients necessary for combustion within the chamber in which they are burned.
Platform / target Dimensions Warhead Propulsion Performance Mark 1 (Bliss-Leavitt) US: 1904–1922: Surface / Surface: Diameter: 21 in (53 cm) Length: 16.4 ft (5.0 m) Weight: 1,500 lb (680 kg) 200 lb (91 kg) Guncotton: Single vertical turbine wheel: Speed: 27 kn (50 km/h) Range: 4,000 yd (3.7 km) Mark 2 (Bliss-Leavitt) US: 1905–1922: Surface ...
Zhuque-2 has a liftoff weight of 216 tonnes and uses 4 TQ-12 methalox engines in the first stage, each with a thrust of 67 tonnes-force (660 kN). [3] [4] The second stage uses one vacuum-optimized TQ-12 with a thrust of 80 tonnes-force (780 kN) in combination with a TQ-11 engine (8 tonnes-force (78 kN) thrust), which acts as a vernier thruster.
The TQ-12 (Chinese: 天鹊-12; pinyin: Tiānquè-12, lit. Sky Lark 12 ) is a gas-generator cycle rocket engine burning liquid methane and liquid oxygen (methalox) developed by LandSpace . [ 4 ] TQ-12 is the first Chinese liquid rocket engine developed with private funding. [ 5 ]