BJT Tech UAV

BJT Tech UAVs are Chinese UAVs developed by Beijing Bai-Ji-Te (BJT) Technologies Ltd. (BJT Tech, 北京佰吉特科技有限公司). A security technology firm, the initial involvement of BJT Tech in UAV arena is providing system integration, flight control and mission control software, as well as some subsystem hardware. Recently, BJT Tech has expanded its UAV business by providing its own UAVs, most of which utilizes commercial off-the-shelf (COTS) airframes.

Unmanned blimp

The first UAV developed by BJT Tech is an unmanned blimp, which is intended for low altitude aerial survey missions. The unmanned blimp can operate as low as two hundred meters above ground, and can achieve accuracy of 1:500, which is the highest among all BJT Tech developed UAVs performing aerial survey missions.^[1]

Hexacopter

BJT Tech hexacopter is a multirotor utilizes COTS airframe and a pair of skids as landing gear. The COTS airframe is integrated with domestic Chinese mission control system (MCS) indigenously developed by BJT Tech for various missions such as advertising, inspection, survey, surveillance, rescue, meteorology, and geodesy.

Octocopter

BJT Tech octocopter is a multirotor developed by BJT Tech for various missions, and is designed to be operated by a single operator all the way from the initial deployment to the complete recovery. This octocopter utilizes COTS subsystem such as flight control systems. Specification:^[2]

Normal operating altitude (m): 350
Navigation: GPS waypoint navigation
Control: Care free
Max payload (kg): 2
Endurance (min): 15 – 40

Multirotor

BJT Tech Multirotor is a multicopter developed by BJT Tech for various missions. The fuselage of this multirotor is a rectangular box containing flight control, power and other system, while the payload is slung directly below the fuselage. Four arms extending out from the fuselage, and at the end of each arm, a pair of two-blade rotor are attached, one above the arm, and the other below. Specification:^[3]

Size (m): 0.72
Rotor diameter (m): 0.14
Height (m): 0.5
Payload (kg): 5
Max take-off weight (kg): 7.91
Cruise speed (m/s): 15
Normal operating altitude (km): 1
Endurance (min): 15 – 20
Max wind scale allowed for operation: 4
Power: 4 lithium batteries

YTQC-HS

YTQC-HS is the first heavier than air UAV developed by BJT Tech. YTQC-HS utilizes COTS airframe, autopilots, and flight control system, which are imported separately to avoid possible western embargo against China. Separate subsystem are integrated together with domestically developed mission payload and mission control software indigenously developed by BJT Tech, which also performs the system integration. YTQC-HS unmanned helicopter is in conventional helicopter layout with a pair of skids as landing gear.^[4]

Miniature unmanned helicopter

Miniature unmanned helicopter developed by BJT Tech is an UAV utilizing COTS airframe and it is in conventional helicopter layout. The unmanned helicopter is electrically powered and landing gear consists of a pair of skids. Specification:^[5]

Control radius (km): 25
Control accuracy (m): 2 – 3
Empty weight (kg): 6
Max take-off weight (kg): 12
Max speed (km/hr): 80
Endurance (min): 25
Ceiling (km): 5
Max wind scale allowed for take-off and landing: 4
Max wind scale allowed for aerial operation: 5
Operating temperature (°C): - 20 to 45
Main rotor diameter (m): 1.72
Length (m): 1.65
Height (m): 0.6
Deployment time (min): 5 – 10
Operators: 3 – 4

Police unmanned helicopter

Police unmanned helicopter is an unmanned helicopter specially developed by BJT Tech utilizing COTS airframe for law enforcement applications. In addition to normal police duties such as aerial surveillance, police unmanned helicopter is also intended for applications in fire fighting and rescue missions. Police unmanned helicopter is in conventional helicopter layout with a pair of skids as landing gear. Unlike most other unmanned helicopters developed by BJT Tech, police unmanned helicopter does not have fairing covering the fuselage.^[6]

Survey unmanned helicopter

Survey unmanned helicopter is an unmanned helicopter developed by BJT Tech by utilizing COTS airframe, and it is intended specially for aerial survey missions. Survey unmanned helicopter is in conventional helicopter layout with a pair of skids as landing gear. Specification:^[7]

Control radius (km): 25
Control accuracy (m): 2 – 3
Payload (kg): 3
Endurance (hr): 1
Max speed (km/hr): 80
Ceiling (km): 2.2
Length (m): 1.778
Width (m): 0.508
Height (m): 0.711
Main rotor diameter (m): 2.146
Engine life (hr): 500
Max wind scale allowed for take-off and landing: 4
Max wind scale allowed for aerial operation: 5
Operating temperature (°C): - 20 to 50
Deployment time (min): 5 – 10
Operators: 3 – 4

Coaxial unmanned helicopter

Coaxial unmanned helicopter is an UAV developed by BJT Tech for various missions, and it is the Chinese equivalent of French Infotron IT 180, to which the BJT UAV looks almost identical, but the BJT version is slightly smaller than its French counterpart. Unlike most other coaxial helicopters where the rotors are atop the fuselage, coaxial unmanned helicopter developed by BJT Tech has an unusual design of the fuselage is sandwiched between two rotors. Payload can be either installed above the top rotor atop of the fuselage, or alternatively, below the bottom rotor below the fuselage. Two versions have been developed, powered by gasoline or electric motor respectively. Specification:^[8]

Propulsion: two stroke 26 cc gasoline engine or DC brushless electric motor
Main rotor diameter (m): 1.8
Empty weight (kg): 10
Max payload (kg): 3 for gasoline powered version, 5 for electrically powered version
Max take-off weight (kg): 15
Max speed (km/hr): 90
Ceiling (km): 3
Endurance (hr): 1.5 for gasoline powered version, 0.5 for electrically powered version

References

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