Here is a complete, single-file interactive HTML calculator. It contains all the simplified model logic you requested, updates in real-time as you change inputs, and outputs the exact table structure you specified. ```html Seastead Leg & Stabilizer Tradeoff Calculator

🌊 Seastead Leg & Stabilizer Tradeoff Calculator

Simplified conceptual model for NACA foil legs, wave response, and active stabilization. Updates in real-time.

Electric Power to RIMs (Watts)

RIM Efficiency (%)

Wave Peak-to-Trough (ft)

Wave Period (s) (used for context only in this simplified model)

Stabilizer Wingspan (ft)

Stabilizer Chord (ft)

Stabilizer Lift Coefficient (CL)

Leg Profile	Dimensions (Total L, Draft, Chord, Width) ft	Waterplane Area (Total Sq Ft)	Restoring Force (Lbs per ft)	Est. Speed @ Input Power (Knots)	Heave w/ Out Stabilizer (ft)	Stab Force (Total) (Lbs)	Stab Influence (Ft Equivalent)	Heave WITH Stabilizer (Final Motion ft)	Est. Weight per Leg (Marine Aluminum lbs)	Est. Cost per Leg + Stab (Marine Aluminum $)

Model Assumptions & Logic:
• Constant Volume: All profiles maintain the exact same displaced volume as the baseline (NACA 0030). Length adjusts inversely with thickness ratio.
• Draft: Fixed at 50% of total leg length as requested.
• Waterplane Area: Approximated as 0.65 × chord × thickness per leg (standard for symmetrical foils at surface cut).
• Speed: Solved from P = ½ρCdA_wetV³ using Cd ≈ 0.012 for streamlined submerged foils.
• Wave Heave (No Stab): Simplified quasi-static coupling: F_exc ∝ A_wp × η. Scaled to ~1.5ft motion on baseline for 2.5ft wave amplitude, as specified.
• Stabilizer Influence: F_stab = 3 × (½ρV²C_LA_stab). Divided by Restoring Stiffness to get equivalent ft displacement countered.
• Weight & Cost: Estimated from 3/8" 5083-H321 marine aluminum shell + 25% structural/bulkhead margin. Cost assumes ~$32/lb fully fabricated marine aluminum. Real-world costs vary with tooling, welding, and outfitting.

``` ### How to use this: 1. **Save** the code above as `seastead_calc.html` 2. **Open** it in any modern web browser (Chrome, Firefox, Safari, Edge) 3. **Adjust** the 7 input fields at the top. The table instantly recalculates all 3 leg profiles. 4. **Export/Embed**: The entire block is self-contained. You can paste it directly into a WordPress HTML block, a static site, or host it standalone. ### Key Design Decisions in the Model: - **Constant Volume Constraint:** Length scales inversely with thickness ratio so displaced volume (and thus buoyancy) stays identical across NACA 0025/0030/0040. - **Wave Response Simplification:** Uses a quasi-static excitation model where heave scales proportionally to waterplane area relative to a calibrated baseline. This matches your request that "smaller waterline makes the seastead move less". - **Stabilizer Physics:** Lift scales with `V²`. The force is divided by the hydrostatic stiffness (64 × Waterplane Area) to show how many vertical feet of wave displacement the wings actively cancel out. - **Real-time Feedback:** Color-coded badges (`Heave WITH Stabilizer`) instantly show which configuration yields the calmest ride under your current inputs.