The KST X20-1035 V3.0 Brushless Tail Servo is a high-speed HV tail servo for 500-800 class EP/GP RC helicopters. KST positions it as the tail-servo member of the X20 platform, with brushless drive, hardened steel HLS gearing, and an aluminum case. Verified KST data lists a DC 6.0V-8.4V voltage range, up to 1.2N.m torque at 8.4V, and 0.030sec/60deg speed at 8.4V. KST's product page also states this as 12Kgf.cm at 8.4V for the same model. The 40 x 20 x 40mm case, 25T 6mm spline, and about 72g weight make X20-1035 V3.0 a compact standard-size tail servo for fast helicopter yaw control. Product Images Features 1.2N.m peak torque - Listed torque reaches 1.2N.m at 8.4V. 0.030sec ultra-fast response - Listed speed reaches 0.030sec/60deg at 8.4V. 500-800 helicopter focus - KST positions it for compatible 500-800 class EP/GP helicopters. Brushless DC motor - Supports fast, efficient tail control. Hardened steel HLS gears - High Life Span gear construction is listed by KST. 6BB support - KST lists 6 ball bearings for the X20 servo platform. Aluminum alloy case - Provides a rigid metal housing. 25T 6mm output spline - Uses the listed spline for compatible horns. 760us/560Hz signal format - Tail-servo command format listed by KST. Combo compatibility - Also appears in KST's X20 Combo set with X20-2208 cyclic servos. Specifications Parameter Value Model KST X20-1035 V3.0 Shopify SKU KST-X20-1035V30 Rated Voltage DC 7.4V Voltage Range DC 6.0V-8.4V Torque 0.9N.m @ 6.0V; 1.1N.m @ 7.4V; 1.2N.m @ 8.4V Speed 0.040sec/60deg @ 6.0V; 0.035sec/60deg @ 7.4V; 0.030sec/60deg @ 8.4V Working Frequency 760us / 560Hz Command Interface PWM command; pulse length 450us-1050us Output Shaft Spline 25T, 6mm Case Material Aluminum alloy Motor Type Brushless DC motor Gear Set Material Hardened steel HLS Position Sensor Potentiometer Ball Bearing 6BB Case Dimensions 40 x 20 x 40mm +/-0.2mm Weight 72g +/-10% Temperature Range -10C to +65C Reference Documents KST X20-1035 V3.0 Technical Specification Application 500-800 class RC helicopter tail control - KST positions it for compatible EP/GP helicopter tail positions. High-speed yaw response - Useful where the setup requires the listed 0.030sec/60deg tail response. X20 Combo replacement or spare - Matches the tail-servo model used in KST's X20 Combo set. HV receiver systems - Works within the listed DC 6.0V-8.4V range when powered correctly. 760us tail-servo systems - Fits systems configured for 760us/560Hz PWM command format. Custom high-speed mechanisms - Can be used in non-helicopter mechanisms after confirming load, voltage, signal, and travel. Packing List Description Quantity KST X20-1035 V3.0 brushless tail servo 1 CNC servo horn 1 Plastic servo horn 2 Grommet 4 Rubber bushing 4 Screw 5 FAQ .faq-accordion details { border-bottom: 1px solid #e6eef8; padding: 14px 0; } .faq-accordion summary { list-style: none; cursor: pointer; font-size: 16px; font-weight: 700; color: #1f2933; position: relative; padding-right: 32px; } .faq-accordion summary::-webkit-details-marker { display: none; } .faq-accordion summary::after { content: "\203A"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%) rotate(90deg); color: #007fff; font-size: 28px; line-height: 1; transition: transform 0.2s ease; } .faq-accordion details[open] summary::after { transform: translateY(-50%) rotate(270deg); } .faq-accordion p { margin: 12px 0 0; color: #4b5563; line-height: 1.65; } How does X20-1035 differ from the X20 Combo set? X20-1035 is a single tail servo. The X20 Combo includes this tail servo plus three X20-2208 V8.0 cyclic servos and additional horns/grommets. Does OpenELAB list multiple Shopify variants for this product? No. The current Shopify product is a single variant with SKU KST-X20-1035V30. What is the maximum listed torque? The technical specification lists 1.2N.m at 8.4V; KST's product page also describes it as 12Kgf.cm at 8.4V. What is the fastest listed speed? The fastest listed speed is 0.030sec/60deg at 8.4V. What voltage range does it support? The listed voltage range is DC 6.0V-8.4V. What is included in the package? KST lists one X20-1035 V3.0 brushless tail servo, one CNC servo horn, two plastic servo horns, four grommets, four rubber bushings, and five screws. What spline does it use? The technical specification lists a 25T, 6mm output shaft spline. What should I check before installation? Confirm the 40 x 20 x 40mm case, 25T 6mm spline, 760us/560Hz signal setup, HV supply, and tail linkage clearance.
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