SpeedyBee F745 35A BLS 25.5×25.5 AIO Flight Controller

The SpeedyBee F745 35A BLS is an integrated all-in-one flight controller combining a 35A brushless ESC, F745 MCU flight processor, and power management in a compact 25.5x25.5mm form factor, designed specifically for high-performance FPV racing drones and freestyle quadcopters. Professional drone pilots and FPV enthusiasts rely on this AIO solution to reduce wiring complexity, minimize weight, and achieve superior flight stability through its advanced gyroscope and accelerometer sensor fusion. This product solves the critical challenge of integrating multiple flight control components while maintaining the precision timing and low-latency response required for competitive FPV racing and acrobatic drone maneuvers.

Product Overview

The SpeedyBee F745 35A BLS flight controller operates on the principle of integrated motor control and stabilization, combining a 32-bit STM32F745 processor with a 35-ampere brushless ESC (Electronic Speed Controller) on a single PCB. The flight controller continuously reads input from its 6-axis IMU (Inertial Measurement Unit) containing a 3-axis gyroscope and 3-axis accelerometer, processes this data through advanced PID control algorithms running at up to 8kHz gyroscope sampling rates, and outputs precisely timed PWM signals to control motor speeds. The integrated 35A ESC eliminates the need for separate ESC modules, reducing total system weight and eliminating inter-component communication latency, which is critical for maintaining stable flight in aggressive maneuvers and high-speed racing scenarios.

What distinguishes the F745 model is its superior processing power compared to F4-based controllers, offering faster computation cycles that enable tighter control loops and more responsive flight characteristics. The 25.5x25.5mm mounting pattern conforms to industry-standard drone frame specifications, ensuring compatibility with most modern FPV racing frames. The integrated BLS (Brushless Speed) controller supports bidirectional DShot protocol, allowing real-time ESC telemetry feedback to the flight controller for enhanced stability monitoring and motor health diagnostics. Built-in voltage regulators provide stable 5V output for receiver and peripheral devices, while the onboard current sensor enables precise battery monitoring and low-voltage cutoff protection to prevent over-discharging your LiPo batteries.

Key Specifications

Specification	Details
Product Type	All-in-One Flight Controller with Integrated ESC
Brand	SpeedyBee
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Main Processor	STM32F745 32-bit ARM Cortex-M7
Integrated ESC Rating	35A Brushless ESC with DShot Protocol Support
IMU Sensor	6-Axis (3-Axis Gyroscope + 3-Axis Accelerometer)
Gyroscope Sampling Rate	Up to 8kHz
Input Voltage Range	2S-6S LiPo (7.4V-22.2V)
PCB Dimensions	25.5mm x 25.5mm
Mounting Pattern	Standard 25.5mm quad frame compatible

Key Features

• Integrated 35A Brushless ESC eliminates separate ESC modules, reducing total system weight by 15-20 grams and improving power delivery efficiency through direct motor control
• STM32F745 processor with 8kHz gyroscope update rate delivers superior flight stability and responsiveness compared to F4-based controllers, enabling precise acrobatic maneuvers and racing line accuracy
• Bidirectional DShot protocol support provides real-time ESC telemetry feedback for motor temperature monitoring, current draw tracking, and advanced flight controller diagnostics
• Onboard current sensor and voltage regulator enable automatic low-voltage cutoff protection, preventing LiPo battery damage and extending battery lifespan
• Compact 25.5x25.5mm form factor fits standard FPV racing frames while maintaining excellent component accessibility for soldering and configuration
• Integrated 5V and 3.3V voltage regulators provide stable power to receivers, GPS modules, and other peripheral devices without requiring external BEC modules

Applications and Use Cases

• FPV Racing: Professional and amateur racing drone pilots use the F745 35A AIO for high-speed gate racing where responsiveness and stability are critical for competitive lap times
• Freestyle Flying: Acrobatic drone performers rely on the fast processing and integrated ESC for smooth flips, rolls, and inverted flying maneuvers with minimal latency
• Cinematic FPV: Content creators building lightweight cinema drones benefit from the reduced component count and weight savings for extended flight times and smooth video footage
• DIY Drone Building: Hobbyists and educational institutions use this AIO solution to simplify drone assembly, reduce soldering points, and create more reliable custom quadcopter builds
• Drone Racing Leagues: Competitive FPV racing events specify F745-class controllers for standardized performance and fair competition across all competing drones

How to Use

Begin by mounting the SpeedyBee F745 35A BLS flight controller to your drone frame using the four mounting holes at each corner, ensuring the arrow marking on the PCB points toward the front of the drone for correct gyroscope orientation. Connect your four brushless motors to the designated motor pads (M1, M2, M3, M4) following the standard rotation pattern, soldering the three motor wires directly to the ESC pads with proper polarity. Connect your LiPo battery to the battery input pads (positive and negative), ensuring correct polarity to avoid damaging the controller, then connect your RC receiver to the designated UART or PPM input pins depending on your receiver protocol.

Flash the latest Betaflight firmware to the flight controller using a USB programming cable and Betaflight Configurator software, which allows you to calibrate the accelerometer, configure PID tuning parameters, and set motor directions. Calibrate the ESC by connecting the battery while holding the throttle stick at maximum, then lower the throttle to minimum to complete the calibration sequence. Use Betaflight Configurator to adjust PID values (P, I, D gains) based on your specific drone weight and frame characteristics, starting with conservative values and gradually increasing them until you achieve stable flight without oscillations. Always perform a range check on your RC transmitter before flying, verify all motor directions spin correctly on the ground, and conduct a short test flight in open space to confirm proper flight controller operation before attempting aggressive maneuvers.

Frequently Asked Questions

What is the maximum current rating and can I use this ESC with larger motors?

The integrated ESC is rated for continuous 35A current draw. While you can theoretically use larger motors, exceeding the 35A rating will cause ESC thermal shutdown and potential damage. For 5-inch racing drones with 2306-2400KV motors, the 35A rating is optimal. For larger 6-inch or 7-inch drones, consider the SpeedyBee F745 50A or 60A variants instead.

Does this flight controller support Betaflight and what firmware versions are compatible?

Yes, the SpeedyBee F745 35A BLS is fully compatible with Betaflight firmware versions 4.3 and later. The F745 MCU is officially supported in the Betaflight configurator. You can download the latest firmware from the official Betaflight GitHub repository and flash it using Betaflight Configurator software via USB connection.

Can I use this AIO flight controller as a replacement if my separate ESC fails?

Yes, the SpeedyBee F745 35A AIO can replace a failed external ESC setup, but you must desolder the old ESC from your frame and properly solder the flight controller to your motor pads and battery connector. Ensure your previous flight controller settings are backed up, as you will need to recalibrate the new AIO controller and potentially adjust PID values for optimal flight characteristics.

What is the input voltage range and can I use 3S LiPo batteries?

The SpeedyBee F745 35A BLS supports 2S-6S LiPo batteries (7.4V-22.2V input range). Yes, 3S LiPo batteries are fully supported and commonly used in lightweight racing drones. The onboard voltage regulator will safely step down the input voltage to power the flight controller and connected peripherals.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
• Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

Buy SpeedyBee F745 35A BLS 25.5x25.5 AIO Flight Controller Online in India

Purchase the SpeedyBee F745 35A BLS 25.5x25.5 AIO Flight Controller online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur,