Foilboard Hull SDF

Generate a symmetrical, single-fin foilboard hull, 183cm long, 51cm max width, 11.2cm max thickness, 75L volume. Units in centimeters throughout. OUTLINE (plan view): Nose is a soft, rounded point (not sharp), width 14cm measured 5% back from the tip. Outline curves continuously and smoothly from nose to a widest point of 51cm located at 52% of length from the nose — no straight sections. From the widest point the outline pulls in steadily to a narrower tail, width 31cm, via a moderate curve radius (not a sharp pin, not boxy). ROCKER LINE (side profile, height above flat reference plane): nose tip 9.5cm; 20% of length 4.0cm; 35% of length 1.8cm; 45% to 65% of length flat and constant at 1.2cm; 80% of length 1.6cm; tail (100%) 3.2cm. The nose curve (0-20%) should be the steepest section. The 45-65% zone must be genuinely flat, not just low. BOTTOM CONTOURS: 0-20% of length: rounded, convex/domed bottom blending into the start of a concave. 20-65% of length: double concave, deepening slightly through 30-45%, flattening out completely by 65%. 65-100% of length: diamond-V bottom with a center ridge running to the tail, two panels angling down moderately to the rail (not aggressive). RAILS: 0-30% of length: soft, fully rounded 50/50 rail, no hard edge. 30-50% of length: rail edge firms up, radius tightens, chine begins forming. 50-100% of length: full hard chine — a crisp, defined angular edge (not a soft radius) running to the tail, with the two rail chines converging just short of the tail point. TAIL: Pulled-in diamond tail shape, 31cm wide, with a hard defined edge (~2mm radius, not rounded) where the diamond-V bottom and both rail chines meet. DECK: Slight dome/crown across the deck. Concave foot pockets fore and aft of a foil box positioned on the centerline with its leading edge at 58-60% of length from the nose, box length approximately 28-30cm. A raised ridge on the deck directly above the rear of the foil box. Maintain smooth, continuous surface transitions throughout except at the deliberate hard chine (from 50% of length to the tail) and the tail edge, which should be crisp and defined. Output: top/plan view, side/rocker profile view, bottom view showing the concave-to-diamond-V transition and chine lines, cross-sections at 20%, 45%, 65%, and 90% of length, and an isometric render. Provide as a STEP or IGES solid if supported, plus a rendered preview image.

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