{"product_id":"300-whale-tail-hydrofoil-stabilizer-fits-outboards-stern-drives-40-350-hp-replaces-se-sport-300-seasierra-300hs","title":"300 Whale Tail Hydrofoil Stabilizer – Fits Outboards \u0026 Stern Drives 40-350 HP (Replaces SE Sport 300 , SeaSierra 300HS)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e300 Whale Tail Hydrofoil Stabilizer\u003c\/strong\u003e is a universal marine hydrofoil designed to dramatically improve your boat's performance, handling, and fuel efficiency. It mounts directly to the cavitation plate of most outboard motors and stern drives in the 40-350 HP range, helping to reduce bow rise, eliminate porpoising and cavitation, and get your boat on plane faster.\u003c\/p\u003e\n\u003cp\u003eThis part is a direct replacement for several models, including SE Sport 300, SeaSierra 300HS, PLSDDS 300, QuickMarine HS003, and NorthBoat FO2003.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls directly onto the anti-ventilation (cavitation) plate.\u003c\/li\u003e\n  \u003cli\u003eConstructed from high-strength, marine-grade UV-resistant nylon for durability.\u003c\/li\u003e\n  \u003cli\u003eIncludes all necessary stainless steel mounting hardware for a complete installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSE Sport\u003c\/td\u003e\n        \u003ctd\u003e300\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSeaSierra\u003c\/td\u003e\n        \u003ctd\u003e300HS\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePLSDDS\u003c\/td\u003e\n        \u003ctd\u003e300\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eQuickMarine\u003c\/td\u003e\n        \u003ctd\u003eHS003\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eNorthBoat\u003c\/td\u003e\n        \u003ctd\u003eFO2003\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModels\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eMost Models\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e2 \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eExcept specific incompatibilities noted below\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eMost Models\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e2 \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eException: Mercury 40 HP 4-Stroke incompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eMost Models\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e2 \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSuzuki\u003c\/td\u003e\n        \u003ctd\u003eMost Models\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e2 \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eMost Models\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e2 \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eTohatsu\u003c\/td\u003e\n        \u003ctd\u003eMost Models\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e2 \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMost Sterndrives\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eMost Sterndrives\u003c\/td\u003e\n        \u003ctd\u003e40-350 HP\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eMarine Hydrofoil Stabilizer\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eCavitation plate mount (anti-ventilation plate)\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eMarine Grade UV-Resistant Reinforced Nylon PA66 Plastic\u003c\/dd\u003e\n  \u003cdt\u003eColor\u003c\/dt\u003e\n\u003cdd\u003eBlack\/Silver (varies by brand)\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e17.0-17.5\" × 14.4-15.5\" × 3.5\" (432-445mm × 366-394mm × 89mm)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e1.38-1.79 kg (3.04-3.84 lbs)\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Engine HP Range\u003c\/dt\u003e\n\u003cdd\u003e40-350 HP\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Engine Types\u003c\/dt\u003e\n\u003cdd\u003e2-Stroke \u0026amp; 4-Stroke outboards, stern drives\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003e1 Year (varies by brand)\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Hardware\u003c\/dt\u003e\n\u003cdd\u003eIncluded (screws, nuts, drill bit)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Hydrofoil Stabilizer\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Mounting Screws\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Mounting Nuts\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Drill Bit\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e1 x Installation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInstallation of this universal hydrofoil requires drilling into the engine's anti-ventilation plate. All necessary mounting hardware and a correctly sized drill bit are included. Always follow the detailed installation instructions provided with your specific product for a secure and safe fit. Be aware that this hydrofoil is not compatible with Mercury 40 HP 4-Stroke engines and may interfere with some shallow water drive systems.\u003c\/p\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow does this hydrofoil improve my boat's performance?\u003c\/summary\u003e\u003cp\u003eBy providing hydrodynamic lift at the stern, the hydrofoil helps the boat plane faster and at lower speeds. This reduces bow rise during acceleration, enhances stability in various water conditions, provides a smoother ride, and reduces issues like porpoising (bow bouncing) and cavitation (propeller ventilation).\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWill this hydrofoil fit my specific engine?\u003c\/summary\u003e\u003cp\u003eThis is a universal stabilizer designed for most outboard and stern drive engines from 40 to 350 HP. Please review the compatibility table. The key exception is the Mercury 40 HP 4-Stroke engine, which is not compatible. Always verify your engine falls within the supported range before purchasing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs drilling required for installation?\u003c\/summary\u003e\u003cp\u003eYes, installation requires drilling four holes in the cavitation (anti-ventilation) plate of your lower unit. The kit includes the necessary drill bit, screws, and nuts to complete the process.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat causes porpoising and will this fix it?\u003c\/summary\u003e\u003cp\u003ePorpoising is the rhythmic bouncing of the boat's bow, often caused by improper weight distribution or trim settings. This hydrofoil helps mitigate porpoising by adding stern lift and improving stability, leading to a smoother and more controlled ride.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are signs my old hydrofoil needs replacement?\u003c\/summary\u003e\u003cp\u003eInspect your hydrofoil for visible cracks, stress marks, or any pieces that have broken off. Damage can reduce effectiveness and potentially create a safety hazard. If you notice a sudden decline in performance benefits, it may be time for a replacement.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718235001147,"sku":"20HS002PL","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/20HS002PL.png?v=1762958030","url":"https:\/\/seasierra.com\/products\/300-whale-tail-hydrofoil-stabilizer-fits-outboards-stern-drives-40-350-hp-replaces-se-sport-300-seasierra-300hs","provider":"SeaSierra","version":"1.0","type":"link"}