Discover the future of sub-250g FPV with the AOS 3.5 V5.1 frame kit, designed to revolutionize your freestyle experience. Engineered with cutting-edge, patent-pending technology and premium materials, the AOS 3.5 V5.1 is the ultimate choice for drone enthusiasts.
Elevate your sub-250g FPV game with the AOS 3.5 V5.1. It is crafted to deliver exceptional performance, durability, and customization in a compact form factor, making it perfect for professionals, enthusiasts, and beginners alike. Unleash your creativity and push the boundaries of freestyle flying. Upgrade to the AOS 3.5 V5.1 and take your FPV experience to the next level!
Version 5.1 introduces compatibility with the DJI O4 Air Unit and DJI O4 Air Unit Pro. It also enhances the interlocking arm geometry and incorporates a central spine to reinforce the arms, further stiffening the flight controller mounting. This improves durability and vibration performance whilst being fully compatible with all AOS 3.5 V5 frames. To upgrade the AOS 3.5 V5 to the V5.1, all that is required is 4x Arms and the central spine.

Easy to Build
The AOS 3.5 V5.1 is engineered to be the most user-friendly FPV frame for building. It is ideal for both beginners and experts, offering ample space and easy access to all screws. Additionally, it features steel-pressed nuts to reinforce the arm mountings.
Vibration Isolation
Say goodbye to unwanted vibrations that can hinder your drone's performance. The AOS 3.5 V5.1 boasts the new patent-pending AOS X-Cell anti-vibration mount for the flight control stack, reducing vibrations by up to 50%. This groundbreaking feature enables you to run lower filtering, dial in higher PID gains, and achieve unparalleled flight performance.
Metal Camera Cage
The AOS 3.5 V5.1 is equipped with an ultra-durable 7075 Aluminium Camera Cage that accommodates 14 - 20mm cameras, ensuring perfect compatibility with a wide range of FPV camera systems. The frame allows for hard or soft mounting of all popular camera systems including Analog, WS Avatar, HDZero, and DJI O3 and O4. ND FIlters are fully supported. STL files for TPU camera mounts are linked above.
Flexible Battery Mounting
Experiment with different battery configurations by choosing between lengthwise or toilet tank battery mounting options. This flexibility allows you to optimize your drone's balance and performance based on your flying style and preferences.
Features:
- Supports up to 3.5" Props
- AOS X-Cell Anti-Vibration Technology
- Up to two 25.5x25.5, or 20x20 mm stacks
- 155° FOV no props in view
- Fully DJI O3 compatible (soft mount + ND filters)
- Supports 19-20mm cameras (hard or soft mounted)
- Reinforced 7075 Aluminium Camera Cage
- Supports Lengthwise or Toilet Tank battery mounting
- 27x21mm M2 GoPro Mounting Pattern
Specifications:
- Product Name: AOS 3.5 V5.1 Frame Kit
- Frame wheelbase: 162mm
- Frame Dimension: L133*W93*H30 mm
- Arm Thickness: 4mm
- Top Plate Thickness: 1.5mm
- Bottom Plate Thickness: 1.5mm
- Upper Plate Thickness: 2mm
- Max Flight Stack Height: 20mm
- Max VTX Height: 20mm
- Motor Mounting: 9x9-φ2mm/12x12-φ2mm
- Flight Stack Mounting: 20*20 Φ2mm / 25.5*25.5 Φ2mm
- VTX Mounting: 20*20/Φ2mm / 25.5*25.5/Φ2mm
- Weight: 81±5g
- Compatible: DJI O3 air unit/ Vista HD system/ BLITZ Whoop 1.6W VTX/DJI O4 Air Unit/DJI O4 Air Unit Pro
Includes:
1x AOS RC AOS 3.5 V5.1 Frame Kit
1x TPU Parts
1x Screw Bag
2x Battery Strap
2x Battery Pads