Hirth Engines and ePropelled Announce Strategic Collaboration to Advance High‑Efficiency Propulsion Systems

The UAV and emerging advanced air‑mobility (AAM) sectors are confronting a classic trade‑off between power‑to‑weight ratio and endurance. Traditional combustion engines deliver high thrust but suffer from fuel consumption and emissions, while pure electric drives are limited by battery energy density. Hybrid propulsion bridges this gap by pairing a proven internal‑combustion core with intelligent electric assistance. Hirth Engines’ century‑old expertise in two‑stroke power units provides a compact, high‑rpm platform, and ePropelled’s patented starter‑generators and power‑management electronics add precise torque control and regenerative capability, creating a versatile powertrain for demanding missions.

The joint venture formalised this synergy, committing both firms to co‑develop integrated hybrid modules for UAVs, defence surveillance platforms, and lightweight ground vehicles. By embedding ePropelled’s smart power electronics directly onto Hirth’s engine architecture, the combined system can switch seamlessly between combustion‑driven cruise and electric‑boosted climb, delivering up to 20 % fuel‑efficiency improvement and extending mission endurance by several minutes. These gains translate into larger payloads, lower operating costs, and compliance with tightening emissions regulations that are reshaping aerospace certification standards worldwide.

From a market perspective, the collaboration positions both companies to capture a rapidly expanding segment projected to exceed $10 billion by 2030. Competitors such as Safran and GE are also pursuing hybrid concepts, but Hirth’s niche two‑stroke heritage combined with ePropelled’s agile software‑centric approach offers a differentiated, cost‑effective solution for small‑to‑medium UAV operators. The upcoming prototype showcase at UMEX Abu Dhabi in January 2026 will provide a tangible proof point, likely accelerating procurement cycles for defence agencies and commercial operators seeking immediate performance upgrades without a full electric redesign.