Skystars KO50 50A 3–6S BLHeli_S 4-in-1 ESC (30×30)

The Skystars KO50 is a heavy-duty 4-in-1 electronic speed controller designed for demanding 5-inch freestyle builds, aggressive racing quads, and medium-to-heavy payload setups running on 3–6S LiPo power. Built on a standard 30.5x30.5mm footprint with robust MOSFETs, it delivers consistent 50A output per channel to drive high-kV motors through rapid throttle transitions without thermal throttling.

Key features

• Delivers 50A continuous current and 60A peak burst capability (up to 10 seconds) per motor channel across 3–6S LiPo inputs.
• Pre-loaded with factory BLHeli_S firmware, offering out-of-the-box compatibility with DShot600, DShot300, Multishot, and Oneshot125 motor protocols.
• Fully compatible with open-source Bluejay firmware upgrades to unlock bidirectional DShot and RPM filtering in Betaflight and INAV.
• Integrated analog current sensor allows precise real-time amperage monitoring and mAh consumption tracking directly on your FPV video OSD.
• Standard 30.5x30.5mm mounting layout with M3 hardware holes ensures direct drop-in integration into standard 5-inch and 6-inch frame stacks.
• Aluminium alloy heatsink and vibration-isolation rubbers, with large motor pads for easier soldering.

Specifications

• Input Voltage: 3-6S LiPo (11.1 V – 22.2 V nominal)
• Continuous Current: 50 A per channel
• Burst Current: 60 A (for 10 seconds)
• MCU: BB21, 48 MHz (8-bit)
• Firmware: BLHeli_S (Bluejay compatible), target Q-H-50 BLS 16.7
• Supported Protocols: DShot600, DShot300, Multishot, Oneshot125
• Current Sensor: Yes (Analog)
• BEC: None
• Mounting Pattern: 30.5x30.5 mm (M3)
• Dimensions: 41 x 46 mm
• Weight: 13.3 g
• In the box: ESC, 35V 560uF capacitor, wiring harness, 4 damping rubbers

Ideal for pairing with any 30.5x30.5mm flight controller using a standard 8-pin wiring harness. When installing on 6S power systems, always solder an external low-ESR capacitor directly across the ESC battery pads to absorb regenerative voltage spikes during active braking and protect onboard electronics.