The Greenough tri-plane hull design is a very fast and efficient bottom contour, featuring rolled hull entry blending into three distinct planing surfaces. A tri-plane is easier to surf than deeply rolled displacement hull, with flatter planing surfaces to drive off of. The tri-plane panels displace water and provide lift as it flows towards the tail, much like the longitudinal cross-section of a tear-drop—the ideal fluid-dynamic form. As water flows towards the tail, the three panels blend back into one single plane—a low-rockered, thin, and flexible tail.
I combine a modern rail profile with a bit of edge starting at the leading edge of the fin to provide a more accessible hull experience. The S-deck keeps volume under your belly-button for efficient paddling and under your feet for a balanced and sensitive foil. Tapered stringers and glass-on fins amplify integrated flex and twist.
Nose templates can follow the classic pointier ~17” nose or the rounder ~18” honker. Shorter templates with round tails are really fast and loose in surf that’s head high and under, while the pintails are more stable and can be driven harder in overhead surf.
Special thanks to Marc Andreini for shaping my personal stubbies and for taking the time to teach me how to foil a proper displacement hull.
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