Design of unmanned aircraft A-4 “Albatross” began in 1998. The set of specific tasks were set. In the first place they touched increasing the operation range in comparison with UAV “Remez”. New UAV should work on 20 km distance. Engineers from CB “Rise” had to not only increase the size of the aircraft, but also use a new and powerful radio transmission of video and control.
The complex of “Albatross-4” keeps the same configuration as the “Remez-3.” But the overall look and the equipment have been changed significantly.
Scheme of A-4 “Albatross” is classic – monoplane with a pusher propeller. Strongly elongated wing provides high aerodynamic characteristics and sufficient stability, regardless of whether the engine is running or not. The wing structure applied flaps, which improved takeoff performance of UAV. But in the rest, “Albatros” is very similar to “Remez”. In new machine proven practical solutions were applied . “Albatross” takes off using a wheeled chassis, which requires a 75-meter flat area. With some modifications, you can use the catapult. Flight is possible in two ways: manually (operator command) and automatic. In both types, indications of location and trajectory parameters are determined with GPS-35 receiver. After processing, the results are transmitted to the PC monitor, which is part of the ground complex.
When drone is out of sight of operator, image from small camera that is installed on the front of the machine is transmitted to a monitor. Camera can perform at low light levels. For example, in twilight. Sufficient stability of the aircraft in flight maneuvers and in strong wind conditions provides the navigation PNA “Rise” complex.
Terrain observance can be made with an interchangeable lenses camera. The camera is mounted on a swinging platform, which may deviate depending on operator commands. This functionality allows you to see objects that are on the sides of the drone without changing the UAV’s course. Also, thanks to this platform “Albatros” can perform target tracking.
A novelty in the A-4K is a parachute landing system. The parachute is released not automatically, but only by the operator. But in the case of an emergency stop of the engine, in excess of the minimum and maximum altitude, and in case of power failure the parachute is released automatically. Forced landing coordinates are also automatically transferred to the operator’s monitor. Thus, the new parachute system not only allows you to save the device from damage during landing, but also greatly simplifies its operation.
Landing on the wheeled chassis is much more complicated. Tests have shown that the UAV’s landing control should be performed by highly skilled and experienced operator. Flight tests began in 2000. The first UAV was used in different climates with different geographical location.
Another direction of improvement of the basic model relates to a new system of governance, which should implement fully autonomous flights on the desired curved or closed route basing on powerful digital computer. In addition, the CB was working to reduce the impact of internal and external interference on the stability and performance of steering and control systems.
Thus, to test the aircraft design characteristics a prototype of UAV A-4K “Albatross” was built and testing began December 12, 2001. They were successful. In addition the use of compact cameras for surveying was tested. “Albatross” is in use so far.
A-4K Albatross. Characteristics:
|engine’s type||1 ED|
|power, kWt||1 x 2.3|
|Cruising speed, km / h||58-105|
|Practical range, km|
|Radius of action, km||5-20|
|Flight duration, h||2|
|Practical ceiling, m|