ELF-BK is a long-range strike unmanned aircraft designed for extended missions against ground targets. In the Elfsystems battlefield-assets materials, the UAV is presented as a platform for engaging enemy personnel, lightly armored vehicles, electronic warfare systems and logistical targets.
Compared with the smaller ELF-K strike configuration, ELF-BK looks like the endurance-focused member of the same family. Its role is not only to carry a warhead, but to stay in the air longer, reach farther objectives and preserve guidance in contested navigation conditions.
More time in the air
The stated maximum speed is 160 kilometers per hour, while cruising speed is 90 kilometers per hour. The defining figure is flight time: ELF-BK is listed at 135 minutes, more than twice the endurance of the shorter-range strike variant.
Operational range reaches up to 240 kilometers. For a strike UAV, that changes the planning logic. The platform is not limited to immediate front-line targets and can be considered for deeper tactical objectives where route stability and mission autonomy are central.
Heavier warhead and precise guidance
ELF-BK carries a fragmentation high-explosive warhead weighing 5,000 grams. That is twice the stated warhead mass of ELF-K and places the system in a heavier strike category within the same drone family.
The listed targeting accuracy is 5 meters. Together with automatic target guidance, this suggests a platform designed around predictable effects rather than only range or payload size. In practice, that combination matters when the target is a logistics node, an electronic warfare position or a lightly protected vehicle.
Navigation and airframe
The aircraft uses RTK navigation based on proprietary beacons. This reduces dependence on satellite navigation and helps the UAV continue its mission when GPS signals are disrupted. For a long-range strike platform, that resilience is especially important because a longer route creates more exposure to electronic warfare.
The airframe is made from composite fiberglass. Launch is performed by an automated pneumatic system, and power comes from two 6s3p battery packs. ELF-BK therefore represents a heavier and more autonomous branch of the ELF line: a fixed-wing strike UAV where endurance, range, payload and navigation resilience define the platform more than raw speed.
