German companies GABLER and FLANQ have completed Sea Acceptance Tests (SAT) for their torpedo-tube-launched uncrewed surface vessel (TTL USV).
The trials validated the seaworthiness of the jointly developed capability demonstrator, known as Ranger , and confirmed the integration and operation of its core systems during at-sea testing. Performance data was collected and verified throughout the trials, completing the proof-of-concept phase of the program.
Designed for launch from a standard 21-inch submarine torpedo tube, the 4.5-meter Ranger is intended to autonomously surface after deployment and carry out covert ISR missions. The platform is equipped with a folding keel and sensor mast, an electric propulsion system, and a configurable payload bay that can be adapted for different missions.
The companies are also developing a one-way attack (OWA) variant, named Strike , while GABLER will lead commercialization, integration with host platforms, and deliveries to naval customers.
According to the partners, submarine-launched autonomous surface systems are expected to play an increasing role in future naval operations by extending the reach of crewed platforms while reducing risk to personnel. Such systems could support missions including intelligence gathering, surveillance, force protection, and other maritime defense tasks.
“The tests confirmed the maturity of the vehicle at this stage of development while demonstrating the excellent progress achieved by the joint team,” said Felix David , TTL USV project lead at GABLER.
Jannik Sauer, chief technology officer at FLANQ, said the successful sea trials demonstrated how conventional naval platforms can be combined with autonomous technologies to develop new operational capabilities.
Ranger combines GABLER’s experience in submarine systems and defense manufacturing with FLANQ’s expertise in autonomous maritime systems, mission software, artificial intelligence-enabled autonomy, and open-architecture technologies.
GABLER and FLANQ will now continue development toward an operational capability for naval users.