SLS-101 · USV
Slackwater
Long-endurance ISR surface vehicle. A hybrid solar–diesel–electric surface vehicle built for weeks-long station-keeping in contested littorals. Low-signature, fuel-frugal, and patient — Slackwater holds position and watches long after crewed assets have to leave.
Slackwater is our flagship and reference platform: every later hull is benchmarked against it. The design philosophy is endurance over speed — a displacement hull, a 1.2 kW solar array, and a small diesel genset combine for sixty-plus days of unrefueled presence.
A retractable multi-INT mast carries EO/IR, radar, and SIGINT-ready payload bays, with low-probability-of-intercept SATCOM and mesh backhaul keeping the picture flowing under emissions control. The Helmsman autonomy stack provides Level 4 operation: GNSS-denied navigation, COLREGS-compliant collision avoidance, and on-board re-planning.
A 58-day endurance bench test completed in January 2026; integrated sea trials are underway in Puget Sound through mid-2026.