{"product_id":"turning-point-express-mach4-propeller-14x21-4-blade-stainless-steel-lh","title":"Turning Point Express Mach4 Propeller 14x21 – 4-Blade Stainless Steel, LH Rotation","description":"\u003ch2\u003e4-Blade Dual Geometry Stainless Steel Propeller – Left-Hand Rotation for Twin-Engine \u0026amp; Counter-Rotating Applications\u003c\/h2\u003e\n\u003cp\u003eThe Express Mach4 14x21 Left-Hand Rotation is a 4-blade stainless steel propeller engineered for boats running 90–300+ hp engines with 4.75\" gearcases. It is the counter-rotating companion to the \u003ca href=\"\/products\/turning-point-express-mach4-propeller-14x21-4-blade-stainless-steel-rh\"\u003eExpress Mach4 14x21 Right-Hand Rotation\u003c\/a\u003e, designed for the port side of twin-engine installations where left-hand (counter-clockwise) rotation is required.\u003c\/p\u003e\n\n\u003cp\u003eLike the RH version, it uses a patented Dual Geometry design — two blade profiles in a single hub — to deliver the acceleration, stern lift, and rough-water stability of a 4-blade while maintaining top-end speed on par with a comparable 3-blade prop. Two blades use an aggressive variable-rake geometry for explosive hole shot and sharp cornering; the other two use an offshore-style design for high speed and maximum stern lift.\u003c\/p\u003e\n\n\u003cp\u003eBuilt from proprietary TP17™ stainless steel — 20% higher chromium content, ~250% stronger and 5× more durable than standard stainless — with large free-flowing exhaust ports (40% more exhaust area than typical competitors) to reduce backpressure and extract maximum power.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLeft-hand (counter-clockwise) rotation — purpose-built for twin-engine and counter-rotating applications\u003c\/li\u003e\n\u003cli\u003eDual Geometry design — two blade profiles in one hub for 4-blade handling with 3-blade top-end speed\u003c\/li\u003e\n\u003cli\u003eUnprecedented hole shot, bow lift, and rough-water stability\u003c\/li\u003e\n\u003cli\u003eLifts the hull higher under load — maintains speed when fully loaded where a 3-blade can lose up to 3 mph\u003c\/li\u003e\n\u003cli\u003eProprietary TP17™ stainless steel — 20% more chromium, ~250% stronger, 5× more durable than standard stainless\u003c\/li\u003e\n\u003cli\u003eLarge free-flowing exhaust ports — 40% more exhaust area for reduced backpressure\u003c\/li\u003e\n\u003cli\u003e14\" diameter × 21\" pitch, 4-blade configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cp\u003eThe Mach4 LH excels on the port engine of twin-engine pontoon and tri-toon boats, sterndrive applications, watersports tow boats, and bay boats where counter-rotating props are used to eliminate torque steer and improve straight-line tracking.\u003c\/p\u003e\n\n\u003ch3\u003eEngine Compatibility\u003c\/h3\u003e\n\u003cp\u003eFits a wide range of outboard and sterndrive applications including Cox®, Evinrude®, Honda®, Johnson®, Mariner®, Mercury®, MerCruiser®, Nissan®, OMC®, OXE®, Parsun®, Suzuki®, Tohatsu®, Volvo Penta®, and Yamaha® engines. Always verify fitment using the manufacturer’s application chart.\u003c\/p\u003e\n\n\u003ch3\u003eRequired Hub Kit\u003c\/h3\u003e\n\u003cp\u003eA hub\/installation kit is required and sold separately. Use a \u003ca href=\"\/products\/masterguard-hub-kit-500-500-series-4-25-4-75-gearcase-outboards-sterndrives\"\u003e500 Series Hub Kit\u003c\/a\u003e for engines under 200 hp, or the \u003ca href=\"\/products\/turning-point-propellers-masterguard-11701700-700-series-installation-hub-kit\"\u003e700 Series Hub Kit\u003c\/a\u003e for engines 200 hp and above. Refer to the application chart for the correct part number for your engine.\u003c\/p\u003e\n\n\u003ch3\u003eRight-Hand Rotation Also Available\u003c\/h3\u003e\n\u003cp\u003eFor the starboard engine or single-engine applications, see the \u003ca href=\"\/products\/turning-point-express-mach4-propeller-14x21-4-blade-stainless-steel-rh\"\u003eExpress Mach4 14x21 Right-Hand Rotation\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e This is the port-side prop for twin-engine setups running the Mach4 in a counter-rotating configuration. Customers typically buy this paired with the \u003ca href=\"\/products\/turning-point-express-mach4-propeller-14x21-4-blade-stainless-steel-rh\"\u003eMach4 14x21 RH\u003c\/a\u003e for a matched set. The Mach4 is the right recommendation when a customer needs better hole shot, stern lift, or load-carrying performance than their current 3-blade delivers — without giving up top-end speed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRotation Clarification:\u003c\/strong\u003e Left-hand rotation is required on the port engine of most counter-rotating twin-engine setups. Always confirm the customer’s engine rotation requirement before ordering — this is the most common mistake on twin-engine prop sales. If unsure, ask the customer to check the existing prop rotation or consult the engine manufacturer’s spec sheet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePitch Selection:\u003c\/strong\u003e The 21\" pitch suits mid-to-high RPM applications. Confirm WOT RPM falls within the engine manufacturer’s recommended range. Step down to the \u003ca href=\"\/products\/turning-point-propellers-31431930-express-mach4-propeller-13x19-4-blade-stainless-steel-rh-rotation-standard\"\u003eMach4 13x19\u003c\/a\u003e if over-propped, or up to the \u003ca href=\"\/products\/turning-point-propellers-31502331-express-mach4-propeller-14x23-4-blade-stainless-steel-rh-rotation-standard\"\u003eMach4 14x23\u003c\/a\u003e if under-propped.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHub Kit Note:\u003c\/strong\u003e Always confirm the hub kit part number from the application chart. The \u003ca href=\"\/products\/turning-point-propellers-11501700-masterguard-installation-model-517-series-500\"\u003eMasterGuard Model 517\u003c\/a\u003e is a common fit for many 500 Series applications.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51215130591268,"sku":"708-31502141","price":852.69,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/708-31501530_60d8fbb7-4ec8-4531-a5f5-542d11a008e1.jpg?v=1786150387","url":"https:\/\/marisolmarine.com\/products\/turning-point-express-mach4-propeller-14x21-4-blade-stainless-steel-lh","provider":"Marisol Marine Company","version":"1.0","type":"link"}