Sunnysky x3520-8 Motor — Overview and Specifications

Name: Sunnysky x3520-8 Motor. Manufacturer: Sunnysky. Category: Drones & Quadcopters > Motors.

Description: The X series of CNC-machined motors features a hollow design that provides excellent cooling and reduces structural weight, while giving the casing visual strength. The casing and covers are made of 6061-T6 aviation aluminum alloy, ensuring high hardness and tensile strength. The motor shaft is made of 420 stainless steel imported from Japan, heat-treated to enhance strength, ductility, and resistance to bending and tearing. The X series uses custom-tuned miniature NMB bearings (imported from Japan) for durable, quiet, and stable operation. The coils are hand-wound — this ensures a tight, neat winding, a better coil fill factor, and increased continuous motor power.

Sunnysky X3520 KV520 — Key Features

• 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: 80 A / 30 s
• Maximum Continuous Power: 2000 W
• Rotor Diameter: 42.5 mm
• Casing Length (without shaft): 45 mm
• Max Lipo Cell: 6S
• ESC (recommended): 60-80A

Sunnysky X3520 KV720 — Technical Details

• Stator Diameter: 35 mm
• Rotor Diameter: 42.5 mm
• Stator Thickness: 20 mm
• Shaft Diameter: 5 mm
• Number of Stator Slots: 12
• Casing Length (without shaft): 45 mm
• Overall Length: 64 mm
• Number of Rotor Poles: 14
• Motor Kv: 720
• Maximum LiPo Cells: 4-5S
• No-Load Current: 1.4 A / 10 V
• ESC (recommended): 80-100A
• Motor Resistance: 19 mOhm
• Recommended Propellers (inches): APC12x6 / APC12x8 / APC13x6.5 / APC13x8 / DXL14

Sunnysky X3520 KV880 — 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
• Casing Length (without shaft): 45 mm

Purpose and Application: Sunnysky X3520 series motors are suitable for heavy multi-copters and professional platforms requiring a combination of high power, reliability, and efficient cooling. Recommended ESCs and LiPo cell counts are specified for each version, allowing for proper electronics selection for specific tasks.

Advantages: High mechanical strength due to 6061-T6 and 420 steel materials, durable Japanese NMB bearings, hand-wound coils for better efficiency and stable operation, wide range of recommended ESCs and Kv variations for different types of copters.

If you need a reliable brushless motor from a trusted manufacturer like Sunnysky — the X3520 offers several modifications (KV520, KV720, KV880) with different characteristics for tasks ranging from powerful heavy platforms to faster configurations.

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