Skystars KO55 55A BLHeli_S 3-6S 30×30 4-In-1 ESC



  • Experience unparalleled power and performance with the SkyStars KO55-55A BLHeli_S 3-6S 30×30 4-in-1 ESC, the ultimate electronic speed controller.

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Skystars KO55 55A BLHeli_S 3-6S 30×30 4-In-1 ESC Features and Specifications:

At The FPV Project, we take great pride in providing high-quality components and equipment for the drone community.

In this article, we present the SkyStars KO55-55A BLHeli_S 3-6S 30×30 4-in-1 ESC, a revolutionary electronic speed controller that provides unparalleled power and performance for FPV drones.

Unleashing Unprecedented Performance

The SkyStars KO55-55A is the pinnacle of ESC technology, designed to meet the demanding requirements of FPV drone pilots seeking exceptional performance and reliability. Let’s delve into the key features that make this ESC stand out from the competition.

1. Power and Efficiency

The SkyStars KO55-55A boasts a remarkable power output, supporting a voltage range of 3-6S, which enables it to handle a wide array of motors and battery configurations. Its advanced BLHeli_S firmware ensures efficient power management, resulting in optimal performance and longer flight times.

2. Cutting-Edge Design

Crafted with meticulous attention to detail, the SkyStars KO55-55A features a compact 30x30mm form factor, making it compatible with various drone frames. Its robust construction and premium components ensure durability and reliability, even in the harshest flying conditions.

3. Advanced Control and Customization

Equipped with a high-performance STM32F051 microcontroller, the SkyStars KO55-55A offers precise control and smooth throttle response, delivering an unrivaled flying experience. The ESC supports various protocols, including DShot, Multishot, and Oneshot, allowing pilots to tailor their flight characteristics to their preferences.

4. Intelligent Features

The SkyStars KO55-55A incorporates intelligent features that enhance the overall performance and safety of your FPV drone. With active freewheeling technology and adaptive timing, this ESC optimizes motor efficiency while minimizing heat generation. Additionally, it supports temperature and current protection, safeguarding your equipment against potential damage.

Installation and Setup

Installing the SkyStars KO55-55A ESC is a straightforward process, requiring basic knowledge of drone assembly. Here’s a step-by-step guide to help you get started:

  1. Begin by carefully connecting the ESC signal wires to the flight controller, ensuring correct polarity and secure connections.
  2. Mount the ESC securely onto your drone’s frame using the provided hardware.
  3. Connect the motor wires to the corresponding ESC pads, adhering to the correct motor order.
  4. Verify that all connections are secure and free from any shorts or loose wires.
  5. Configure the ESC settings using the BLHeliSuite software, adjusting parameters such as motor direction, ESC protocols, and timing to suit your preferences.


  • Supports telemetry functions (including Voltage, RPMS, & Current)
  • Toshiba standard 40V 5×6 Mosfet & electronics
  • Lead-free SMT Processing technology
  • ESC Onboard Current Sensor
  • Over-Current Capabilities
  • Supports 6S Batteries
  • 6-layer Layout Design
  • BLHeli_S Firmware


  • Dimensions: 41x46mm
  • Mounting Holes: 30.5×30.5mm/¦µ3mm
  • Weight:13.3g
  • Supports: 3-6S Lipo input
  • Firmware: BB21 MCU, 48Mhz Runs BLHELI 16.X Firmware
  • Current sensor: YES
  • BEC: NO
  • Supports: DShot DShot150/300/600/MultiShot/ OneShot etc.
  • Target: Q-H-30 BLS 16.7
  • BLHeliSuite download


  • 1x Skystars BLHeli_S 4-in-1 3-6S 30×30 ESC (KO55 – 55A)
  • 1x 35v 560uf Capacitor
  • 4x Rubber Grommet
  • 1x Wire Harness
  • 1x XT60 Cable
FPV Drone PID Explained - Mastering Flight Performance through PID Tuning - Oscar Liang


Alright, let’s dive into the world of PID loop frequencies! 🏊‍♂️🌊

So, imagine you’re playing a really immersive video game. 🎮 You press a button on your controller, and your character responds instantly on the screen, right? Now imagine if there was a delay between your button press and the character’s action. That would be a bummer, wouldn’t it? 😕

Well, in the world of drones, we have a similar situation. The drone’s flight controller is constantly making adjustments to keep the drone flying smoothly. This happens through something called the PID loop, which stands for the Proportional, Integral, and Derivative loop. 🔄🚁

The PID loop is like the brain of the drone. It takes information from the sensors, decides how the drone should respond, and then sends commands to the motors. This entire process happens repeatedly and at a very fast pace. The frequency at which this process repeats is known as the PID loop frequency. It’s like the frame rate in a video game – the higher the frame rate, the smoother the game looks. 🧠🔄

Now, when we talk about 2K, 4K, and 8K PID loop frequencies, we’re talking about how many times per second this process happens. So, 2K means the PID loop runs 2000 times per second, 4K means it runs 4000 times per second, and 8K means it runs 8000 times per second. It’s like choosing between running, cycling, or driving – each one is faster than the last! 🏃‍♂️🚴‍♂️🏎️

So, you might be thinking, “Well, obviously 8K is the best because it’s the fastest, right?” Not necessarily! Just like driving a car super fast isn’t always the best option (you could get a ticket or crash 😱), running your PID loop at super high frequencies isn’t always the best choice.

For one, it can make your flight controller work harder, which can lead to overheating. It can also make your ESC protocol more prone to errors, kind of like how a fast internet connection can sometimes be unstable. 🌡️🔥

So, it’s all about finding the right balance. Just like how you wouldn’t use a race car to go to the grocery store, you wouldn’t necessarily use an 8K PID loop frequency for a casual drone flight. It all depends on what you’re using your drone for. 🚁😉

I hope this helps to understand what PID loop frequencies are all about! If you have any more questions, feel free to ask. Happy droning! 🚁🎮🌤️

Read More About Lipo Batteries by clicking the link below:

Checkout our Frames Collection by clicking the link below:

1S = 1 cell  = 3.7V
2S = 2 cells = 7.4V
3S = 3 cells = 11.1V
4S = 4 cells = 14.8V
5S = 5 cells = 18.5V
6S = 6 cells = 22.2V

For example, we call a 14.8V battery a “4-cell” or “4S” battery.

LiPo battery is designed to operate within a safe voltage range, from 3V to 4.2V. Discharging below 3V could cause irreversible performance loss and even damage to the battery. Overcharging above 4.2V could be dangerous and eventually cause a fire.

However, it’s advisable to stop discharging when it reaches 3.5V for battery health reasons. For example for a 3S Lipo, the max voltage is 12.6V, and you should land when the voltage reaches 10.5V (at 3.5V per cell).

Weight 0.2 kg
Dimensions 18 × 10 × 10 cm


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