Unmanned Aerial Vehicles.

LUCAS FLM 136.

The LUCAS (Low-cost Unmanned Combat Attack System) is a U.S. long-range loitering munition / one-way attack unmanned aerial vehicle developed and manufactured by SpektreWorks, a defense technology company based in Arizona, United States. Within the manufacturer’s internal designation system the platform is identified as FLM-136, indicating its position within the Flexible Loitering Munition (FLM) family of unmanned combat systems. The LUCAS system is designed as a low-cost attritable precision strike drone intended for rapid production and deployment, providing U.S. forces with a scalable unmanned attack capability suitable for modern high-intensity operations.

Country users: United States

Description

The LUCAS (Low-cost Unmanned Combat Attack System), internally designated by SpektreWorks as FLM-136, is an American loitering munition developed as part of the United States’ effort to accelerate the fielding of low-cost unmanned strike systems capable of rapid operational deployment. The platform was developed by SpektreWorks of Arizona, a company specializing in unmanned systems and counter-UAS technologies, and emerged during the mid-2020s as the Pentagon sought to introduce attritable unmanned weapons that could be produced quickly and deployed in significant numbers.

The drone was publicly presented in July 2025 during a technology showcase at the Pentagon, where U.S. Defense Secretary Pete Hegseth walked through the Pentagon’s inner courtyard alongside representatives from more than a dozen defense companies demonstrating new military technologies. The LUCAS drone, developed by SpektreWorks, was among the systems displayed during this event as part of a broader initiative aimed at accelerating the introduction of innovative military equipment for the U.S. armed forces.

According to reporting by Reuters on March 3, the United States later successfully deployed the LUCAS drone in combat during Operation Epic Fury, marking one of the fastest transitions from public unveiling to operational employment for a modern U.S. unmanned combat system. The drone reportedly debuted in combat operations targeting Iran-related threats, demonstrating the Pentagon’s increasing reliance on rapidly fielded unmanned strike capabilities.

The system has also demonstrated operational deployment in naval environments. On 16 December 2025, a LUCAS drone successfully launched from the flight deck of the Independence-class littoral combat ship USS Santa Barbara (LCS-32) while the vessel was operating in the Arabian Gulf. The launch illustrated the capability of the platform to be deployed from U.S. Navy surface combatants, highlighting its adaptability for expeditionary operations and maritime strike missions.

These events illustrate the rapid progression of the LUCAS program from Pentagon demonstration to operational deployment, reflecting broader U.S. efforts to accelerate the fielding of low-cost unmanned combat systems capable of supporting modern distributed warfare concepts.

LUCAS FLM 136 variants:

- LUCAS / FLM-136 Block 1: Baseline production loitering munition configuration developed by SpektreWorks.
- LUCAS ISR Variant (conceptual): Surveillance-oriented configuration equipped with enhanced reconnaissance sensors.
- LUCAS Electronic Warfare Variant (conceptual): Variant designed to carry electronic warfare payloads for radar or communications disruption missions.

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Technical Data

Design

The LUCAS (FLM-136) loitering munition features a compact fixed-wing airframe designed for endurance, aerodynamic efficiency, and simplified manufacturing, with a length of approximately 2.99 m (9.8 ft), a wingspan of 2.50 m (8.2 ft), and an overall height of about 0.46 m (1.5 ft). The drone has a maximum launch weight of approximately 81.6 kg (180 lb) and is designed to carry both fuel and payload within a lightweight composite airframe structure optimized for attritable operational use. The aircraft can carry up to 33.1 kg (73 lb) of fuel, enabling long-duration missions while maintaining efficient aerodynamic performance.

The airframe incorporates straight fixed wings optimized for stable flight during extended missions, combined with a twin-fin tail arrangement that provides directional stability and control authority during high-speed maneuvering and terminal strike phases. Propulsion is provided by a rear-mounted pusher propeller powered by an internal combustion engine (ICE), selected for its mechanical simplicity and fuel efficiency during long-range operations. The system is designed to be launched from ground-based rail or catapult launch systems, and operational demonstrations have also shown the capability to deploy the drone from naval platforms such as littoral combat ships.
Payload and Avionics

The LUCAS loitering munition incorporates a forward fuselage payload compartment capable of carrying up to 18.1 kg (40 lb) of mission payload, typically consisting of an explosive warhead configured for strike operations. Depending on mission requirements, the payload may include high-explosive fragmentation warheads for soft targets, blast warheads optimized for infrastructure destruction, or shaped-charge payloads capable of defeating armored vehicles or fortified positions. The payload is integrated with a forward-mounted electro-optical sensor system, enabling operators to observe the target area and confirm engagement during the loiter phase prior to initiating the final attack.

The avionics suite integrates GPS satellite navigation and inertial navigation systems, allowing the aircraft to follow pre-programmed waypoint routes over operational distances of approximately 822 km (444 nautical miles). A secure digital datalink system connects the drone to ground control stations, enabling operators to monitor telemetry, receive imagery, and adjust mission parameters. The onboard mission computer manages autonomous flight stabilization, navigation, and attack trajectory control, allowing the aircraft to transition automatically from loitering surveillance into the terminal dive attack once a target is selected.
Flight Capabilities

The LUCAS loitering munition is designed for long-endurance autonomous operations with a maximum endurance of approximately 6 hours, allowing it to travel long distances and remain on station above a target area while awaiting engagement authorization. The aircraft maintains a cruise speed of approximately 137 km/h (74 kt) during standard mission flight, while it can accelerate to a maximum dash speed of about 194 km/h (105 kt) during terminal attack phases or rapid maneuvering.

The drone is capable of operating at altitudes of up to 4,572 m (15,000 ft), providing an operational envelope that balances surveillance effectiveness with reduced vulnerability to ground fire. Its flight control system allows the aircraft to maintain stable loiter patterns even in wind conditions of up to 65 km/h (35 kt), enabling reliable operation in challenging environmental conditions. With an operational range of approximately 822 km (444 nautical miles) and endurance sufficient for extended loitering, the LUCAS platform can conduct deep strike missions against targets located far beyond the immediate frontline before transitioning into a high-speed terminal dive to destroy the designated objective.
Combat Use

In operational employment the LUCAS loitering munition is intended to provide long-range precision strike capability that can be deployed in large numbers during high-intensity combat operations. Its endurance of up to six hours and operational range of roughly 822 km (444 nautical miles) allow the drone to reach targets deep within enemy territory, including air defense radars, logistics depots, command centers, artillery batteries, and armored formations. Because the system is designed for relatively low production cost compared with conventional guided missiles, military forces can deploy multiple drones simultaneously to saturate enemy air defense networks, increasing the probability of successful strikes while maintaining operational flexibility.