Based on the unique parameters of your design—which operates similarly to a SWATH (Small Waterplane Area Twin Hull) but in a trimaran configuration—there are several fascinating hydrodynamic and physical variables at play. Because your floats are constant-chord vertical foils with small waterplane areas, your design behaves more like a semi-submersible oil platform than a traditional yacht.
Assuming I have reviewed your current progress, here are the next most important major topics you need to look into, specifically focusing on the areas where your design radically departs from traditional boat hulls.
The Issue: In a normal yacht, if you add 1,000 lbs of gear, the boat barely sinks a fraction of an inch because it has a huge waterplane area. Your design is the exact opposite.
The Math: A NACA foil that is 10 ft long and 3 ft wide has roughly 20 to 22 square feet of cross-sectional area. With 3 legs, your total waterplane area is only about 60 to 65 sq ft. To support 1 pound, you must displace water. At this small waterplane area, your Pounds per Inch Immersion (PPI) is extremely low (roughly 340 lbs per inch).
Action Item: Calculate an exhaustive weight estimate (mass budget). You must ensure your structure and payloads do not exceed the narrow buoyancy limits of the 9.5 feet of submerged foils, and calculate your longitudinal center of gravity very precisely.
The Issue: Your airplane-style stabilizers (with elevator tabs) are a brilliant way to control pitch and roll with minimal actuator force while under way. However, hydrodynamic foils require constant fluid flow to generate lift.
The Reality of Seasteading: A seastead spends 95%+ of its life at anchor or drifting (zero speed). At zero speed, those 10-foot wings act only as passive dampening plates (flat-plate drag). Because of your low waterplane area, long ocean swells will lift the platform, but short, choppy waves could cause an uncomfortable, undamped bobbing or twisting motion.
Action Item: Study the vessel's hydrostatic stability at zero speed (specifically heave/pitch periods). Consider if your RIM drives can be utilized in conjunction with the stabilizers (using prop-wash over the wings) to maintain active dynamic stabilization even when the seastead is not traveling forward.
The Issue: You are building a massive "kite." The massive 80x40 foot solar roof, the 7-foot tall truss, and the 14x45 foot superstructure combine to create an enormous surface area exposed to the wind (sail area).
The Risk: Traditional yachts have deep keels or a lot of submerged hull volume to resist lateral wind force. Your underwater profile consists of only three 10x3 ft foils. In a 40-50 knot squall, the wind force pushing sideways or lifting the massive flat roof could overpower the small righting moment provided by your narrow foil buoyancy. The seastead could list heavily to one side, potentially submerging a foil entirely and jeopardizing the truss structure.
Action Item: Perform an Aerodynamic Overturning Moment calculation. You need to know exactly how much wind force it takes to sink the leeward (downwind) leg past its 9.5 feet of remaining reserve buoyancy, and ensure your center of gravity is low enough to prevent capsizing.
The Issue: Because your structure is not a continuous monohull, structural fatigue at the attachment points will be immense. You have three long levers (the 19-foot legs) attached to an 80x40 foot rigid triangular truss.
The Physics: When a wave hits the front leg from an angle, it will attempt to push that leg sideways/up, while the two back legs are anchored in calm water. This translates massive twisting forces (torsion) directly into the joints where the 3-foot wide foils meet the underside of the truss.
Action Item: Finite Element Analysis (FEA) of the joint where the struts meet the main truss. Since the top half of the leg includes built-in ladders, ensure the cutouts for the ladders do not compromise the structural integrity of this vital load path.
Note: The combination of a large footprint (80x40), low enclosed volume, and small waterplane foils means this concept has excellent potential to bypass surface chop entirely. Solving the weight constraint and the zero-speed stability will be the key to making this design a success.
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