Q1: What is the main advantage of the 32MB blackbox?

A: The 32MB blackbox storage is a significant upgrade for pilots focused on competitive tuning and analysis. Unlike smaller 16MB chips, it allows for logging all essential flight data (gyro, PID loops, motor outputs, etc.) at the highest sampling rates for several full battery packs without running out of space.

Q2: How does the ICM42688 gyro improve flight performance compared to common alternatives like the BMI270?

A: The ICM42688 gyro offers significantly lower noise and higher stability. This provides a cleaner signal to the flight controller, enabling tighter filtering, more aggressive PID tuning, and ultimately more precise, responsive control during high-speed maneuvers.

Q: What is the iFlight BLITZ ATF435 Stack (E55S 2-6S) used for in FPV drones?

A: This FPV stack combines an F4 flight controller and a 55A 4-in-1 ESC, designed for 5-inch freestyle and racing drones requiring stable and powerful performance.

Q: Is the iFlight BLITZ ATF435 stack good for 5 inch FPV freestyle drones?

A: Yes, it is optimized for 5-inch freestyle drones, offering smooth flight control and strong ESC performance for aggressive flying.

Q: Does the iFlight ATF435 flight controller support Betaflight firmware?

A: Yes, the F4 flight controller is fully compatible with Betaflight, supporting features like OSD, RPM filtering, and advanced tuning.

Q: What battery voltage is supported by the ATF435 stack?

A: It supports 2S to 6S LiPo batteries, making it flexible for both lightweight and high-power FPV builds.

Q: What motors work best with the E55S 55A ESC in this FPV stack?

A: It works best with 2207, 2306, or similar motors commonly used in 5-inch FPV freestyle and racing drones.

Q: Does the iFlight ATF435 stack support digital HD systems like DJI O3?

A: Yes, it supports HD systems via UART connections, allowing integration with digital VTX setups.

Q: Is the BLITZ ATF435 stack beginner-friendly for FPV drone builds?

A: It is suitable for intermediate users, as soldering and setup require basic FPV building experience.

Q: Why does my FPV drone have noise or oscillations with this stack?

A: This is usually due to vibration, poor soft mounting, or incorrect Betaflight filtering and PID tuning.

Q: What firmware does the E55S ESC use and does it support BLHeli_32?

A: The ESC supports BLHeli_32 firmware, enabling features like bidirectional DShot and RPM filtering.

Q: How do I install the iFlight BLITZ ATF435 stack in a frame?

A: Install using standard 30x30 mounting holes, connect ESC to FC, and solder motors and power leads securely.

Q: Why are my motors not spinning correctly with this FPV stack?

A: This may be caused by incorrect motor order, ESC signal issues, or wrong Betaflight configuration.

Q: Is the iFlight BLITZ ATF435 stack worth buying for FPV builds?

A: Yes, it offers a strong balance of performance, reliability, and compatibility for 5-inch FPV freestyle and racing drones.

New

iFlight BLITZ ATF435 Stack (E55S 2-6S)

About iFlight BLITZ ATF435 Stack

The iFlight Blitz ATF435 Stack/Combo provides dependable performance and efficient control of your 2-6S powered quadcopter. This 30x30 stack/combo features an ATF435 FC and 55A 8Bit 4in1 ESC to give you responsive controls and reliable power delivery. Fly worry-free and explore new heights. This flight controller comes with plug-in ports for 9V VTXs, LED/Buzzer, receiver, camera, & the ESC. The NEW ATF processors allow for a product like this that is feature-rich and comes with a 55Amp ESC, which is perfect for those amp-hungry builds.

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MEPS NEON 2306 V2 High-Efficiency Brushless Motor for 5'' Freestyle FPV Drone
1950KV / Fluorescent Green
$10.33 Save $0.66
MEPS NEON 2207 5 inch FPV Drone Brushless Motors 1950KV/2050KV/2550KV
1950KV / Fluorescent Green
$9.31 Save $0.59

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24-Month Warranty | 2 Years Full Protection
30-Day Returns From Shipment | 7-Day No-Reason Returns
24h Support Response | 24h Fast Support Guarantee

Top highlights

Premium Combo: AT32F435 FC with ICM42688 gyro + 55A (65A burst) 2-6S ESC.
32MB Blackbox: Extensive logging for precise tuning and analysis.
6S Power & Sensing: Handles high voltage with accurate current monitoring (200A rate).
Dual BEC & Lightweight: 5V/2.5A & 9V/2A outputs; total stack weight only ~22.5g.
Full Protocol Support: SmartAudio, DShot, Multishot & Blheli_S/Bluejay firmware.

Payment | Every order you place with us is safe & secure

Push Your 6S Build Hard Without Power Cutouts

The BLITZ E55S 4-in-1 ESC delivers 55A continuous current with 65A burst support, giving your quad the power headroom needed for hard throttle punches, fast recoveries, and amp-hungry 6S setups. Instead of worrying about unstable throttle response or power drops mid-flight, you can focus on sending bigger lines with more confidence.

Check out our FPV Stack, all FPV Flight Controller Collection and the rest of our iFlight Products!

Feel More Connected to Your Quad in Every Freestyle Move

Powered by the AT32F435 processor and ICM42688 gyro, the BLITZ ATF435 Stack delivers smoother signal processing and faster flight response compared with older budget flight controllers. From split-S transitions to tight proximity lines, the quad feels more locked-in and controlled when pushing technical freestyle moves.

Cleaner Wiring. Easier Tuning. Less Bench Time.

The BLITZ ATF435 Stack includes plug-in connections for the ESC, receiver, camera, LED/Buzzer, and 9V VTX systems to simplify the build process and reduce cable clutter. With built-in 32MB Blackbox storage, tuning and analyzing flight behavior also becomes much easier — helping you spend more time flying instead of sitting at the workbench.

A Solid Choice for Lightweight DJI O3 Freestyle Builds

With dual BEC outputs, DJI-ready compatibility, full protocol support, and a lightweight stack weight of approximately 22.5g, the BLITZ ATF435 Stack fits naturally into modern 5-inch O3 freestyle and cinematic builds. Whether you're building a daily freestyle quad or a lightweight HD ripper, the stack delivers the balance of performance, simplicity, and reliability that modern FPV pilots look for.

FC Specifications

MCU: AT32F435RGT7

Gyro: ICM42688

Barometer: DPS310

OSD Chip: AT7456E

Flash: 32MB (Blackbox flash)

UARTS: 6

Motor outputs: 4x (SH1.0 connector)

I2C serial: SDA / SLA pads

Smartaudio / IRC Tramp VTX protocol supported

LED controller: Yes

Beeper pad: Yes

Firmware target: IFLIGHT_BLITZ_ATF435

Mount pattern: 30.5*30.5mm / 4mm PCB hole diameter

Dimensions: 36.5*35 mm

Weight: 7.8g

BEC: 5V 2.5A / 9V 2A

ESC Specifications

Mounting Holes: 30.5*30.5mm/Φ4mm

Weight: 14.7g

Supports 2-6S lipo input

MCU: BB21

Constant: 55 Amps

Burst: 65 Amps

Current sensor: Yes

BEC: No

Current rate: 200

Supports: DShot DShot150/300/600/

MultiShot/ OneShot etc.

Target: Q-H-25 16.7(BlheliS) / Bluejay Q-H-50 (Bluejay)/Q-H-25 - Bluejay, 0.16, 24kHz

Buying Guide: iFlight BLITZ ATF435 Stack

Is the iFlight BLITZ ATF435 Stack Worth Buying?

The iFlight BLITZ ATF435 Stack (E55S 2-6S) is designed for pilots who want a reliable and powerful 30x30mm stack for modern 5-inch FPV builds. With an AT32F435 processor, ICM42688 gyro, 32MB Blackbox Flash and 55A 4-in-1 ESC, it delivers the performance needed for freestyle, racing, DJI digital FPV and long-range applications.

Compared with older F4 flight controllers, the BLITZ ATF435 provides improved processing capability and better hardware compatibility for current Betaflight setups. It is a strong choice for pilots upgrading an existing drone or building a new 5-inch quad who want professional-level features without moving to expensive flagship stacks.

The BLITZ ATF435 is especially suitable for pilots who value clean installation, stable flight performance and long-term reliability. For most freestyle and racing builds, it provides the right balance between power, features and price.

Key Features of iFlight BLITZ ATF435 Stack

AT32F435 Processor with ICM42688 Gyro

The BLITZ ATF435 uses the AT32F435 MCU, offering excellent processing performance for modern FPV firmware and advanced Betaflight tuning. Combined with the ICM42688 gyro, it provides smooth control response, reliable noise performance and stable flight characteristics.

For freestyle pilots performing fast rolls, flips and aggressive throttle changes, a quality gyro and clean signal processing are more important than simply choosing the highest specification processor.

Built-In 32MB Blackbox Flash Storage

One of the advantages of the BLITZ ATF435 is its integrated 32MB Blackbox Flash memory. Blackbox logging allows pilots to analyze flight data, adjust PID settings and troubleshoot vibration or tuning issues.

Compared with solutions that require additional storage accessories, built-in Flash memory keeps the build cleaner and makes setup easier, especially for pilots who regularly tune their FPV drones.

55A 4-in-1 ESC for 2S-6S FPV Builds

The included E55S ESC supports 2S to 6S batteries and provides enough current capability for most 5-inch FPV drones. Whether you are building a freestyle quad with powerful 2207/2306 motors or a racing drone requiring fast throttle response, the 55A ESC offers reliable performance and extra power headroom.

Its compact 30x30mm stack design makes installation easier and keeps the build organized, making it suitable for both new pilots and experienced builders.

Who Should Buy the iFlight BLITZ ATF435 Stack?

The BLITZ ATF435 is recommended for:

✓ 5-inch freestyle drone builds
✓ FPV racing drones
✓ DJI O3 digital FPV setups
✓ 6S high-performance quads
✓ Pilots upgrading from older F4 stacks

If you want a modern FPV stack with strong processing power, reliable ESC performance and easy compatibility with current components, the iFlight BLITZ ATF435 is one of the most balanced choices in its price range.

iFlight BLITZ ATF435 vs SpeedyBee F405 V4

The SpeedyBee F405 V4 is one of the most popular budget FPV stacks because of its excellent value and beginner-friendly features. However, the iFlight BLITZ ATF435 offers several advantages for pilots who want a cleaner and more performance-focused build.

Comparison	iFlight BLITZ ATF435	SpeedyBee F405 V4
MCU Processor	AT32F435	STM32F405
Gyro Sensor	ICM42688	ICM42688
ESC Current Rating	55A 4-in-1 ESC	55A 4-in-1 ESC
Battery Support	2S-6S	3S-6S
Blackbox Storage	32MB Built-in Flash	Micro SD Card
Best For	Performance-focused freestyle and racing builds	Budget builds and beginners

Recommended Build Compatibility

The iFlight BLITZ ATF435 uses a standard 30x30mm mounting pattern, making it compatible with most popular 5-inch FPV frames.

5-inch Freestyle Build

• 2207 / 2306 motors
• 6S LiPo battery
• DJI O3 Air Unit
• ELRS receiver

5-inch Racing Build

• Lightweight racing frame
• High-performance motors
• 4S or 6S battery setup

Long Range FPV Build

• GPS module support
• Efficient motors
• Long-distance FPV configuration

Why Choose iFlight BLITZ ATF435 Stack?

The iFlight BLITZ ATF435 Stack is a smart choice for pilots who want modern FPV performance, reliable hardware and excellent value in one package.

Compared with older F4 stacks, it provides improved processing power, better gyro performance and more convenient Blackbox storage. Compared with some feature-heavy alternatives, it keeps the design simple, lightweight and focused on actual flight performance.

Whether you are building a new 5-inch freestyle drone, upgrading your current setup or looking for a dependable stack for DJI digital FPV, the BLITZ ATF435 delivers the performance and reliability needed for modern FPV flying.

Recommended for:
⭐ 5-inch freestyle pilots
⭐ FPV racing builders
⭐ DJI O3 digital FPV users
⭐ Pilots upgrading from older F4 stacks

Recommended Parts

● T-HOBBY F60PRO V 2207.5 Brushless Racing Motor for 5 inch FPV Drones

● MEPS SZ5145 3-Blade FPV Drone Propeller for 5-inch Drones Lightweight

● Boslipo P7 Version 1480mAh 150C 6S FPV Battery

● RadioMaster TX15 Max Radio Controller – STM32 H7 Chip,Dual-Band ELRS (2.4G/900M)

● iFlight Skyviz Analog FPV Goggles with Dual OLED & Built-in Receiver

Packing List

1 x BLITZ ATF435 Flight Controller

1 x BLITZ E55S 4-IN-1 2-6S ESC

1 x wire harness for ATF435 Flight controller

1 x silicon grommets

Note: iFlight product is for fun purposes only and does not support autonomous flight.

More expert advice

Best FPV Stack for Your FPV Drone

Flight Controller Not Connecting to Betaflight?

What are the Popular Products of Iflight?

Reviews

B*************K
Verified

The ATF435 chip is very stable. I’m running this on a 5-inch freestyle build and the blackbox logging is super clean. Plug-and-play features with DJI O3 worked perfectly.

Specification：ATF435 E55S 2 6S
M*********R
Verified

Superbe qualité. The ATF435 chip is very stable. I’m running this on a 5-inch freestyle build and the blackbox logging is super clean. Solid connection and the plug-and-play features with DJI O3 worked perfectly.

Specification：ATF435 E55S 2 6S
M**c
Verified

Superbe qualité. The ATF435 chip is very stable. I’m running this on a 5-inch freestyle build and the blackbox logging is super clean. Solid connection and the plug-and-play features with DJI O3 worked perfectly.

Specification：ATF435 E55S 2 6S
R***********l
Verified

Very clean setup and works flawlessly under hard freestyle. No desync issues and overall performance feels very stable.

Specification：ATF435 E55S 2 6S
P**************c
Verified

Cleanest layout I've worked with in a while. The plug-and-play setup for DJI O3 is a massive time saver. Everything feels solid and the mounting dampeners provided are high quality. Worth every penny for a high-end build.

Specification：ATF435 E55S 2 6S
R******d
Verified

arrived fast and packaging was solid. solder pads are nice and big, easy to work with. works great out of the box, no issues so far.

Specification：ATF435 E55S 2 6S

Additional reviews after 12 days
been flying 2 weeks now, still very stable and responsive. good experience with mepsking.
C********t
Verified

good value for what you get. strong performance and no desync issues. also nice that DJI plug is included, saved me time.

Specification：ATF435 E55S 2 6S

Additional reviews after 10 days
had a crash and one wire came loose, contacted support and they replied quick with help. appreciate that.
B************V
Verified

Just finished installing this stack and it looks really clean in my build. Components feel premium and layout is well designed. Everything was well packed and arrived in perfect condition.

Specification：ATF435 E55S 2 6S

FAQ Feel free to ask us any questions

Q1: What is the main advantage of the 32MB blackbox?: A: The 32MB blackbox storage is a significant upgrade for pilots focused on competitive tuning and analysis. Unlike smaller 16MB chips, it allows for logging all essential flight data (gyro, PID loops, motor outputs, etc.) at the highest sampling rates for several full battery packs without running out of space.
Q2: How does the ICM42688 gyro improve flight performance compared to common alternatives like the BMI270?: A: The ICM42688 gyro offers significantly lower noise and higher stability. This provides a cleaner signal to the flight controller, enabling tighter filtering, more aggressive PID tuning, and ultimately more precise, responsive control during high-speed maneuvers.
Q: What is the iFlight BLITZ ATF435 Stack (E55S 2-6S) used for in FPV drones?: A: This FPV stack combines an F4 flight controller and a 55A 4-in-1 ESC, designed for 5-inch freestyle and racing drones requiring stable and powerful performance.
Q: Is the iFlight BLITZ ATF435 stack good for 5 inch FPV freestyle drones?: A: Yes, it is optimized for 5-inch freestyle drones, offering smooth flight control and strong ESC performance for aggressive flying.
Q: Does the iFlight ATF435 flight controller support Betaflight firmware?: A: Yes, the F4 flight controller is fully compatible with Betaflight, supporting features like OSD, RPM filtering, and advanced tuning.