This article is based on an official press release from Rotron Aerospace and LIG Nex1.

Rotron Aerospace and LIG Nex1 Sign Strategic Deal for Next-Gen UAV Propulsion

On December 9, 2025, UK-based propulsion specialist Rotron Aerospace and South Korean defense prime LIG Nex1 formalized a significant strategic partnership. Signed at Rotron’s headquarters in Dorset, United Kingdom, the Memorandum of Understanding (MoU) establishes a long-term collaboration aimed at co-developing next-generation unmanned aerial vehicle (UAV) platforms. The agreement, which remains valid until 2032, focuses primarily on the Medium UAV Common Platform (MUCP), a tactical hybrid drone program designed for the Republic of Korea Army (RoKA).

According to the joint announcement, this collaboration leverages the specific strengths of both nations’ defense industries. Rotron Aerospace will supply its advanced heavy-fuel rotary propulsion systems, while LIG Nex1 will lead the system architecture, platform integration, and overall program management. The deal underscores the deepening defense ties between the United Kingdom and South Korea following the 2023 Downing Street Accord.

The Medium UAV Common Platform (MUCP)

The centerpiece of this agreement is the MUCP, a hybrid Vertical Take-Off and Landing (VTOL) drone intended for Intelligence, Surveillance, and Reconnaissance (ISR) missions. LIG Nex1, having been awarded the tender by South Korea’s Defense Acquisition Program Administration (DAPA) in August 2024, is moving rapidly toward flight testing, which is expected to commence in 2026.

The platform utilizes a hybrid configuration featuring four fixed rotors for vertical lift and a single pusher propeller for forward flight. This design eliminates the need for runways while maintaining the endurance and speed associated with fixed-wing aircraft. According to technical specifications released regarding the program, the MUCP targets a Maximum Take-Off Weight (MTOW) of approximately 340 kg and a payload capacity of 30 kg.

Propulsion Technology

Rotron’s contribution is critical to the platform’s performance. The company specializes in Wankel-type rotary engines, which are favored in the UAV sector for their high power-to-weight ratio and low vibration profiles, essential characteristics for stabilizing sensitive ISR sensors. Crucially, Rotron has engineered these engines to operate reliably on heavy fuels such as JP-8 and Jet-A1, meeting the NATO Single Fuel Policy requirements that simplify military logistics.

“Rotron is proud to partner with LIG Nex1… This agreement reflects our commitment to delivering high-performance propulsion and aviation systems that enhance the capability, reliability, and operational reach of next-generation unmanned platforms.”

Gilo Cardozo, CTO & Founder, Rotron Aerospace

Strategic Implications and Export Goals

While the immediate focus is the domestic South Korean market, both companies have explicitly stated their intention to target global exports, specifically within the Pacific Rim and Europe. The partnership allows LIG Nex1 to secure a sovereign supply chain for critical propulsion components while providing Rotron access to major Asian defense markets.

Yoon Kwan-seob, Vice President of Aerospace & Drone Business at LIG Nex1, highlighted the synergy between the two firms in a statement regarding the signing:

“By combining our experience in integrated system development with Rotron’s leading propulsion technologies, we aim to advance the Medium UAV Common Platform and expand opportunities for both domestic Republic of Korea programmes and international exports.”

Yoon Kwan-seob, VP of Aerospace & Drone Business, LIG Nex1

AirPro News Analysis

The selection of Rotron for the MUCP program highlights a persistent engineering bottleneck in the tactical UAV sector: the heavy-fuel requirement. While battery technology has improved, it still lacks the energy density required for the 5+ hour endurance missions targeted by the MUCP. Furthermore, traditional piston engines often struggle with the combustion characteristics of heavy military fuels like JP-8, particularly in smaller form factors.

By integrating Rotron’s rotary technology, LIG Nex1 appears to be prioritizing reliability and logistical commonality over the simplicity of electric-only systems. This hybrid approach, using electric lift for VTOL and heavy-fuel combustion for cruise, is becoming the standard architecture for modern tactical drones (Group 3 UAVs) that require runway independence without sacrificing range.

Sources

Sources: Satellite Evolution Group