Take the next step forward in FPV frame evolution: Enjoy fewer oscillations, less Jello in HD footage, better propwash handling and a smoother and more responsive flight feel. It’s science.

The AOS 5 uses a scientific approach to take high performance 5 inch freestyle frames to the next level. Designed from the ground up based on a combination of finite element simulation and real-world flight testing this frame boasts excellent vibration and resonance performance. This means you can run less filtering and higher PID gains for a smoother and more responsive feel with greatly improved mid-throttle oscillations and cool motors.

  • 115g with all hardware

  • Designed for up to 5.1 inch props

  • 6 mm Arms

  • 2.5 mm Top Plate, Bottom Plate and Sandwich Plates

  • Up to two 30.5x30.5 mm or 20x20 mm stacks

  • 32x32mm GoPro mounting holes in top plate

  • Fits the DJI Air Unit or Caddx Vista perfectly

  • Fits the DJI FPV camera or 19x19 mm camera (with 1 mm washers)

  • Recommended motor size 2306, 2207, 2208

  • Standoffs, frame and motor screws included

 
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THE CHALLENGE 

Learn about the challenges that led to the AOS 5

 

Vibrations limit performance 

As a pilot I often struggled with Jello, mid-throttle oscillations and propwash handling on my 5 inch freestyle mini quads. As an aerothermal engineer I realized that the issue lay in the vibration and resonance performance of the quadcopter frame itself.

Even the cleanest motors and props produce large amounts of vibration in flight. These vibrations excite the resonant modes of the frame amplifying vibrations at certain frequencies, increasing their amplitude and energy. These vibrations pass into the gyro and create noise on the signal. This noise requires additional filtering and limits maximum PID gains through motor heating.

 

The result is a flight controller that is slower to respond to propwash and your stick inputs. The AOS 5 is designed to be better.

 
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THE DESIGN

Understand the design methodology behind the AOS 5

Harmonic analysis is the key 

I used Blackbox logging and harmonic analysis to visualize the vibrations of the AOS 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.

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KEY FEATURES 

See the key features of the frame

 

Top and bottom plates

Both of these plates are 2.5mm thick to provide an optimal balance between strength, stiffness and weight. However, it is all too easy to destroy the strength and stiffness of a plate with poorly designed cut-outs.

The cut outs in the top and bottom plate of the AOS 5 are designed to preserve as much of the bending and torsional stiffness of the plate as possible whilst minimizing weight.

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Arms

The AOS 5 uses a distinctive truss design for the arms. This truss design provides enormous torsional stiffness, resolving a key source of vibration in traditional frames. It also allows two particularly harmful resonant modes to be individually modified to separate them in frequency.


Truss structures are inherently very strong as they convert bending loads into compression and tension in the individual members. Carbon is much stronger in pure tension and compression than in bending. The compression members lock together in the center of the frame to spread the load in a crash.

 

Y-shaped motor protectors minimize the risk of damage to those expensive components. Should you ever need to replace an arm, there are only two screws to undo and neither are shared with your electronics.
 

Camera Protection

The AOS 5 uses 2.5mm Carbon Plates to hold and protect the camera. These are stiffer, lighter and cheaper to replace than aluminum or titanium.

 

The camera plates include a stiffener for the top plate to increase stiffness and better manage the additional weight of a GoPro mounted on the included 32x32mm mounting holes.

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Go Pro Mount

The AOS 5 has 32x32 mm M3 mounting holes for 3D printed mounts for your HD camera.

You can download an STL for the mount shown here.

Manufacturing

A great design is nothing without great manufacturing. I trust CNCMadness (based on the Canada–United States border) to manufacture this frame to the highest standards.

 

I have been consistently impressed by their quality and attention to detail throughout the prototyping process. They provide high quality carbon fiber cut to exceptionally tight tolerances ensuring interlocking parts slide together without any slop.

 

Once you’ve held a frame made by these guys I hope you’ll agree that you won’t want anyone else cutting your carbon.

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