Eos C VTOL is a Threod Systems electric vertical-takeoff unmanned aircraft system used for tactical ISR, target acquisition, and artillery-fire adjustment. The Estonian aircraft combines fixed-wing cruise with VTOL launch and recovery, an eOpic-5 EO/IR payload, encrypted line-of-sight communications, GNSS-denied navigation features, and documented Ukrainian wartime use after Lithuanian and Ukrainian crowdfunding purchases.
Lithuanian crowdfunding purchased EOS C VTOL reconnaissance UAVs for Ukraine in June 2022 while Ukrainian operators trained on the system; the Prytula Foundation later said Ukrainian Defense Forces had used EOS C VTOLs in the war for reconnaissance and artillery-fire adjustment, including HIMARS support.
Role detailsThreod presents Eos C and Eos D as members of its Eos unmanned aircraft system line; Stream C is a separate larger Threod UAV family rather than a supported Eos C variant.
| Variant | Configuration | Designation notes |
|---|---|---|
| Eos D | Eos-family VTOL UAS with eOpic-6 ISTAR payload and laser-designation role | Threod says Eos D builds on the existing Eos C VTOL reconnaissance platform. |
Threod markets Eos C VTOL as an aircraft-and-payload package built around its stabilized eOpic-5 sensor for day, low-light, and thermal reconnaissance.
| Carried item | Item type | Carriage evidence |
|---|---|---|
 | EO/IR payload | Threod says Eos C VTOL is equipped with the eOpic-5 payload for ISR missions, combining stabilized electro-optical sensors and system-specific software. Sources: Eos C VTOL |
The Eos C VTOL package is built for small teams that need runway-independent surveillance from confined terrain. Threod lists a 10 x 10 m obstacle-free takeoff and landing area, while Dutch Army reporting described a 15 m clear radius during battalion training.
Pilot and mission-control software modules support aircraft operation, payload control, mission planning, and real-time monitoring from the ground-control station.
The integrated eOpic-5 payload combines a Full HD daylight camera, low-light/NIR capability, a thermal channel, 30x optical zoom, and onboard target or scene tracking.
Threod lists AES-256 encrypted digital links, MIMO/MANET/MESH radio modes, GNSS-independent navigation, interference avoidance, and an optional CRPA anti-jamming antenna.
Threod's company timeline lists the first Eos C VTOL delivery in 2020.
Sources: About Threod Systems
Ukrainian and Lithuanian reporting described Lithuanian crowdfunding purchases of EOS C VTOL reconnaissance drones for Ukraine, with Ukrainian operators training on the system.
Sources: Ukrinform Lithuania buys four more drones for Ukraine, Oryx Lithuanian weapons deliveries to Ukraine
Threod's published timeline says more than 100 Eos C VTOL systems had been delivered by 2023.
Sources: About Threod Systems
The Dutch Ministry of Defence magazine described EOS C VTOL use by 42 Pantserinfanteriebataljon Limburgse Jagers during Bastion Lion training, including ISR employment and fielded operating details.
Sources: Dutch Ministry of Defence EOS C VTOL
Threod unveiled Eos D at Eurosatory 2026 as an Eos-family VTOL UAS that builds on Eos C VTOL and adds an eOpic-6 ISTAR payload with laser-designation capability.
Sources: Threod Eos D Eurosatory 2026 press release
