{"product_id":"sv905-12-hv-brushless-metal-gear-17kgf-cm-0-04sec-tail-servo-for-550-700-class-rc-helicopters","title":"KST SV905-12 SHV 12V Brushless Tail Servo 17Kgf.cm 0.04sec for 550-700 RC Helicopters","description":"\u003cp\u003eEngineered exclusively for demanding 550 to 700 class 3D and F3C competition helicopters, the \u003cstrong\u003eKST SV905-12\u003c\/strong\u003e high-voltage brushless tail servo delivers blistering 0.040s\/60° transit speed, an immense 17 kgf.cm of holding torque at 13V, and a dedicated \u003cstrong\u003e760μs \/ 560Hz narrow-band\u003c\/strong\u003e working frequency. Featuring direct 3S LiPo \/ 12V battery drive capability, a high-efficiency brushless motor, and hardened steel gears housed in a full CNC aluminum casing, the SV905-12 locks in rock-solid tail authority through the most violent pirouetting maneuvers and high-speed backward flight.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Fast 760μs \/ 560Hz Narrow Band:\u003c\/strong\u003e Purpose-built for modern flybarless (FBL) gyro tail channels, delivering instantaneous corrections, ultra-low latency, and pinpoint stopping power without bounce-back.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSuper High-Voltage (SHV) Direct Drive:\u003c\/strong\u003e Native 8.0V–13.0V operating range supports direct 3S LiPo connection — bypassing separate voltage regulators, cutting system weight, and simplifying wiring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlistering 0.040s Transit Speed:\u003c\/strong\u003e Blazing-fast 0.040 sec\/60° response at 13V (0.045s at 12V) ensures immediate tail lock under sudden pitch-pump and load changes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrushless DC Motor:\u003c\/strong\u003e Delivers higher sustained torque efficiency, cooler running temperatures, and exceptional lifespan with zero brush degradation under extreme 3D flight loads.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardened Steel Geartrain:\u003c\/strong\u003e Precision-cut steel gears with dual ball bearing support eliminate slop and resist shock loads from aggressive tail stops.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull CNC Aluminum Casing:\u003c\/strong\u003e Precision-machined alloy housing provides structural rigidity, exact mount alignment, and rapid thermal dissipation during high-power sessions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProgrammable:\u003c\/strong\u003e Supports customizable parameters for fine-tuning via KST programming tool (check programming tool manual for voltage compatibility).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e SV905-12 Brushless Tail Servo\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e 550–700 Class RC Helicopter Tail Rotor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Voltage:\u003c\/strong\u003e DC 12.0V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e DC 8.0V – 13.0V (2S–3S LiPo Direct Drive)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Frequency:\u003c\/strong\u003e 760μs \/ 560Hz (Tail Gyro Dedicated)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMotor Type:\u003c\/strong\u003e Brushless DC Motor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGear Set Material:\u003c\/strong\u003e Hardened Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCase Material:\u003c\/strong\u003e CNC Aluminum Alloy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBearings:\u003c\/strong\u003e Dual Ball Bearings (2BB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePosition Sensor:\u003c\/strong\u003e Potentiometer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -10°C to +65°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProgrammable:\u003c\/strong\u003e Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 40.5 × 20.0 × 38.0 mm (±0.2mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 70g (±10%)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003ePerformance Ratings\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStall Torque:\u003c\/strong\u003e\n    \u003cul\u003e\n      \u003cli\u003e13 kgf.cm @ 8.4V\u003c\/li\u003e\n      \u003cli\u003e16 kgf.cm @ 12.0V\u003c\/li\u003e\n      \u003cli\u003e17 kgf.cm @ 13.0V\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Speed (No-Load):\u003c\/strong\u003e\n    \u003cul\u003e\n      \u003cli\u003e0.060 sec\/60° @ 8.4V\u003c\/li\u003e\n      \u003cli\u003e0.045 sec\/60° @ 12.0V\u003c\/li\u003e\n      \u003cli\u003e0.040 sec\/60° @ 13.0V\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eDimensions \u0026amp; Sizing\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/SV905-12-02.png?v=1789615016\" alt=\"KST SV905-12 Servo Dimensions Diagram 1\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/SV905-12-01.png?v=1789615016\" alt=\"KST SV905-12 Servo Dimensions Diagram 2\"\u003e\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eDocumentation\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/SV905-12_Specification_d276fb57-5276-4d0c-a58b-f59a9633b49f.pdf?v=1789615028\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDownload SV905-12 HV Brushless Servo Technical Specification Sheet (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KST","offers":[{"title":"Default Title","offer_id":50444214698234,"sku":null,"price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0846\/8280\/1402\/files\/SV905-12-2.png?v=1789014748","url":"https:\/\/kstdigital.com\/products\/sv905-12-hv-brushless-metal-gear-17kgf-cm-0-04sec-tail-servo-for-550-700-class-rc-helicopters","provider":"KSTDigital","version":"1.0","type":"link"}