2021 Sea Water Phantom 400

The 2021 Sea Water Phantom 400 is a 42-foot rigid inflatable built on a fiberglass hull with a planing design. Twin Yamaha outboards deliver 850 horsepower total, with cruising speed around 28 knots and a maximum speed of 42 knots. The boat carries substantial fuel capacity and benefits from joystick control for easy maneuvering.

The layout centers on a spacious open deck with walk-around access from stern to bow, secured by side rails. A cabin forward includes a head with integrated facilities—uncommon for a semi-rigid of this size and a notable feature for onboard comfort and usability overnight. The design works equally well for day cruising, overnight trips, or extended coastal passages, with volume and stability suited to varied conditions.

Accommodations and deck amenities are configured for both leisure and utility. The generous beam and buoyant sponsons provide a stable platform and comfortable motion. The layout supports multiple uses: family cruising, entertaining guests, tender or transfer duties for larger yachts, or commercial charter and dive operations where range, deck space, and shelter matter.