Flight performance is the cornerstone of every AOS frame. Exceptional vibration and resonance performance reduces propwash, oscillations and motor heating. Not only does the AOS 5.5 V2 fly amazingly on Betaflight 4.3 stock settings; it also allows you to push your PID and filter settings further than ever before to achieve unparalleled stick feel and minimal filter delay.

The new arm geometry provides even more stiffness in key directions as well as improved durability in front impact. The 3 screw motor mounting reduces weight and removes the motor hole that can be a stress riser for compressive failure.

The AOS 5.5 V2 offers unparalleled flexibility for your electronics supporting up to 30×30 mm stacks in the front centre and rear. It also supports the DJI Air Unit and HDZero 1W VTX, the original DJI HD FPV camera or any standard micro sized camera.

The AOS 5.5 V2 features 2 slots for captive battery straps on the top plate as well as an XT60 pass through to keep battery cables away from the props. The GoPro mount uses the AOS standard 32x32mm mounting but includes pre installed press nuts to make mounting a breeze. 

Building the frame couldn’t be simpler. Just 8 standoffs and 16 screws are needed and none of the frame screws are shared with your electronics. Only 2 screws need to be undone to change an arm.

Specifications

• Product Name: AOS 5.5 EVO V1.2 Frame Kit
• Frame wheelbase: 237mm
• Frame Dimension: 188*145*32.5 mm
• Arm Thickness: 6mm
• Top Plate Thickness: 2mm
• Bottom Plate Thickness: 2.5mm
• Upper Plate Thickness: 2mm
• Motor Mounting: 16*16mm / 19*19mm
• VTX Mounting: 20*20/Φ2mm / 25.5*25.5/Φ2mm
• Weight: 194 grams

Harmonic analysis is the key

I used Blackbox logging and harmonic analysis to visualize the vibrations of the AOS 5.5 during the design process. This allowed me to tune the geometry of every part of the frame, moving the frame resonances up and away from the motor frequencies and separating them as far as possible. This avoids, as far as possible, the situation where the motor frequencies match a frame resonant frequency and so amplification is minimized.

As a result, you can run less filtering. Every layer of filtering adds delay that’s mathematically related to how effectively it removes vibrations. This delay prevents the flight controller from responding rapidly enough to propwash leading to poor propwash handling. Reducing the amount of filtering is the best way to improve propwash handling. With the AOS 5 you’ll be in the best possible position to reduce your filtering to an absolute minimum.

Another advantage of lower noise is the ability to run higher PID gains. Higher PID gains allow the quad to track your stick movements with less delay and more precision. The result is greater confidence, particularly when flying tight lines where fast reactions are vital.

Included

• 1x AOS 5.5 Evo FPV Frame Kit with TPU parts