{"product_id":"fan-blade-propeller-2-5-inch-2mm-hole-4-blade-no-209","title":"2.5\" Fan Blade Propeller (2mm Shaft Hole, 4 Blades) - No.209","description":"\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003eThe \u003cstrong\u003e2.5\" 4-Blade Fan Propeller (No.209)\u003c\/strong\u003e is a lightweight, durable plastic propeller designed specifically for hobbyists, makers, and students. Featuring a highly efficient four-blade aerodynamic design, it provides smoother airflow and higher thrust at lower RPMs compared to standard two or three-blade alternatives. The center hub features a precision \u003cstrong\u003e2mm diameter hole\u003c\/strong\u003e, engineered to create a tight, friction-fit onto the shafts of standard hobby DC motors, such as the ubiquitous 130-size, 140-size, or 260-size motors.\u003c\/p\u003e\n\n\u003cp\u003eWhether you are building a custom desktop summer cooling fan, a wind-powered generator model for a classroom science fair, or providing thrust for a DIY RC hovercraft or airboat, this inexpensive four-blade component is an absolute staple for basic electromechanical projects.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePeople also search for:\u003c\/strong\u003e 4 blade toy fan, 2.5 inch propeller, 2mm shaft propeller, dc motor fan blade, hobby motor fan, diy airboat prop, no 209 fan.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e No. 209\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlade Count:\u003c\/strong\u003e 4 Blades\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Diameter:\u003c\/strong\u003e 2.5 inches (Approx. 63.5 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Hole Diameter:\u003c\/strong\u003e 2.0 mm (Designed for a tight friction fit on 2mm motor shafts)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-impact molded plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Ultra-lightweight for high efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eApplications\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSTEM Education:\u003c\/strong\u003e Perfect for classroom physics projects demonstrating wind energy, thrust, and basic motor circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIY Cooling Fans:\u003c\/strong\u003e Building small, battery-operated portable fans for desks or camping with improved airflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRC Vehicles:\u003c\/strong\u003e Providing smooth forward thrust for custom-built remote control airboats, hovercrafts, or lightweight foam airplanes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenerators:\u003c\/strong\u003e Acting as a wind turbine blade to spin a motor in reverse to generate small electrical currents.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch5\u003eFrequently Asked Questions (FAQ)\u003c\/h5\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit my small DC toy motor?\u003c\/strong\u003e\u003cbr\u003e\nA: Most likely, yes. The vast majority of standard hobby DC motors (like the common rectangular 130 motor or the round 300 motor) use a standard 2mm metal shaft. This fan is specifically molded to press tightly onto that 2mm shaft.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the advantage of 4 blades over 2 or 3 blades?\u003c\/strong\u003e\u003cbr\u003e\nA: A 4-blade propeller typically moves more air volume per revolution and runs smoother (with less vibration) than a 2-blade prop, making it excellent for cooling fans and steady thrust applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: The fan keeps flying off the motor shaft when it spins really fast. How do I fix this?\u003c\/strong\u003e\u003cbr\u003e\nA: If the friction fit has become loose over time, you can secure the propeller permanently by placing a tiny drop of super glue (cyanoacrylate) inside the shaft hole before pressing it onto the motor.\u003c\/p\u003e\n\n\u003ch5\u003ePackage Includes\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e1 × 2.5\" Fan Blade Propeller (2mm Hole, 4 Blades) - No.209\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TOMSON ELECTRONICS","offers":[{"title":"Default Title","offer_id":48287207948526,"sku":"RBA-02861","price":12.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2132\/9029\/files\/2.5_Fan_Blade_Propeller_2mm_Shaft_Hole_4_Blades_-_No.2.jpg?v=1783688149","url":"https:\/\/www.tomsonelectronics.com\/products\/fan-blade-propeller-2-5-inch-2mm-hole-4-blade-no-209","provider":"Tomson Electronics ","version":"1.0","type":"link"}