Sunnysky X3520-8 Motor

Brand: Sunnysky. Category: Drones & Quadcopters > Motors. This X-series brushless motor is an excellent choice for professional and amateur multi-copters where high power, reliability, and efficient cooling are important.

Series Description and Design Features

X Series, CNC-milled: The body features a hollow design, ensuring efficient cooling and reducing motor weight, giving it a modern and robust appearance. Solid Stainless Steel Shaft: The shaft is made of 420 stainless steel imported from Japan; after heat treatment, it gains high strength, excellent ductility, and increased resistance to bending and breakage. 6061-T6 Aviation Aluminum Alloy: The top and bottom covers are made of high-strength 6061-T6 aluminum, guaranteeing structural hardness and reliability. Imported NMB Bearings: Miniature NMB bearings from Japan are used for durable, quiet, and stable operation. Hand-wound Coils: The coils are hand-wound, ensuring tight and neat placement, a better fill factor, and increased continuous motor power.

Technical Specifications and Motor Variants

The series offers several variants with different KV and electrical parameters. A complete list of data for each variant is provided below.

Sunnysky X3520 KV520 Brushless Motor — Specifications:

• Stator Diameter: 35 mm
• Stator Thickness: 20 mm
• Number of Stator Slots: 12
• Number of Rotor Poles: 14
• No-load Current: 1.1 A / 10 V
• Motor Resistance: 23 mOhm
• Maximum Continuous Current (short-term): 80 A / 30 s
• Maximum Continuous Power: 2000 W
• Rotor Diameter: 42.5 mm
• Body Length: 45 mm
• Max LiPo Cell: 6S
• Recommended ESC: 60-80 A

Technical Specifications: Sunnysky X3520 KV720

• Stator Diameter: 35 mm
• Rotor Diameter: 42.5 mm
• Stator Thickness: 20 mm
• Shaft Diameter: 5 mm
• Number of Stator Slots: 12
• Body Length (without shaft): 45 mm
• Overall Length: 64 mm
• Number of Rotor Poles: 14
• Motor KV: 720
• Max LiPo Cells: 4-5S
• No-load Current: 1.4 A / 10 V
• Recommended ESC: 80-100 A
• Motor Resistance: 19 mΩ
• Recommended Propellers (inch): APC 12x6, APC 12x8, APC 13x6.5, APC 13x8, DXL 14

Sunnysky X3520 KV880 Brushless Motor — Technical Specifications:

• Stator Diameter: 35 mm
• Stator Thickness: 20 mm
• Number of Stator Slots: 12
• Number of Rotor Poles: 14
• No-load Current: 2.0 A / 10 V
• Motor Resistance: 15 mOhm
• Maximum Continuous Current: 83.8 A / 30 s
• Maximum Continuous Power: 1360 W
• Rotor Diameter: 42.5 mm
• Shaft Diameter: 5 mm
• Body Length (without shaft): 45 mm

These characteristics allow you to choose the optimal Sunnysky X3520 motor variant for your tasks — from heavy payloads to high-speed multi-copters. Thanks to their robust construction (420 stainless steel shaft, 6061-T6 aluminum), imported NMB bearings, and hand-wound coils, these motors stand out for their reliability, long service life, and stable operation under load. If you need high power density and efficient cooling — the Sunnysky X3520 series will be an excellent choice.

Other technical details and compatibility with electronic speed controllers (ESCs) and propellers are listed above; when selecting ESCs and batteries, pay attention to the recommended values for each KV variant.

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