Trimaran Seastead Design

Structural Overview

The Triangle Frame

The core of the seastead is a massive triangular truss structure providing unparalleled rigidity and deck space.

Dimensions: 80 feet front-to-back, 40 feet wide.
Structure: 7-foot high truss (floor to ceiling) encompassing the entire triangle.
Safety: 4-foot high railing around the entire perimeter to keep occupants safe.
Layout: Features a "Front" point, "Left" point, "Right" point, and a "Back" edge between left and right.

Living Space & Porch

Designed for comfort and connection with the ocean environment.

Enclosed Area: 14 feet wide by 45 feet long, situated on the centerline near the back edge.
Windows: Lots of windows on the front and back, with select side windows for panoramic ocean views.
Open Porch: The entire remaining area of the triangle outside the living space is a covered, open-air porch.
Roof: Fully covered floor and ceiling, with the roof dedicated entirely to solar energy generation.

Flotation & Propulsion

Buoyancy Legs / Wings

Three distinct floats create a small waterline area for deep-water stability similar to an oil platform, but with hydrodynamic efficiency.

Shape: NACA foil profile, 19 feet long, 10 foot chord, 3 feet wide.
Placement: Attached to the underside of the triangle at the three points, extending down into the water. Blunt leading edge faces forward for easy movement.
Buoyancy: 50% submerged (9.5 feet draft) and 50% above water (9.5 feet freeboard).
Access: Built-in ladders on the front (top half) of each leg for easy water access.

RIM Drive Thrusters & Dinghy

Redundant, efficient propulsion and convenient utility boating.

Thrusters: 6 RIM drive thrusters (2 per leg, mounted 3 feet from the bottom). Aimed to push water past the wing and toward the back for maximum thrust.
Dinghy Storage: 14-foot RIB boat with 1 outboard motor, stored behind the living area.
Davits: 2 supports/ropes go over the railing to lift and hold the dinghy. The outboard motor rests sideways against the opposite side of the railing.
Wind Protection: While moving, the living area blocks the wind from the stowed dinghy.

Active Stabilization System

"Little Airplane" Stabilizers

Three underwater stabilizers—one attached near the back of each main leg—ensure a smooth, stable ride whether parked or underway.

Main Wing: 10-foot wingspan, 1-foot chord.
Body: 6 feet long.
Elevator: 2-foot wingspan, 6-inch chord.
Actuation: A small actuator adjusts the elevator angle up or down, effectively changing the angle of attack of the main wing without needing a large, heavy actuator.
Pivot Balancing: The main leg tapers to a thin edge at the back where the stabilizer attaches. A notch cut into the front/center of the stabilizer's wing (about 25% of the chord) allows the center of lift to balance perfectly on the pivot point.

Optional Extras & Community Upgrades

These modular additions make the seastead exceptionally fun, resilient, and community-focused.

Stabilizer Trimaran

Advanced dynamic stability for unmatched comfort in rough seas.

Tension Leg Structure

Ultimate parked stability, anchoring the seastead firmly against wave action.

Kite Robot Core

Incredible backup propulsion and power generation harnessing high-altitude winds.

Ship-to-Ship Transfer

Safe, seamless movement of people and goods between seasteads at sea.

Convoy Mode

Allowing a community of seasteads to travel, navigate, and weather storms together.

Design Philosophy

This seastead design perfectly balances the need for deep-water stability and hydrodynamic efficiency. The NACA-foil trimaran legs provide a minimal waterline area to ignore wave swell, while the active "little airplane" stabilizers ensure a level platform at all times. With solar power, efficient RIM drives, and protected dinghy storage, it is completely self-sufficient. Add in the optional extras—like wind-harvesting kite robots and convoy mode networking—and you have a seastead that is not just a home, but a resilient, mobile community node capable of navigating the oceans safely and comfortably.