Hacking the APM2 Part #5: Flight Testing

This is the payoff video showing the hybrid autopilot system in action in the Resolution 3 airframe. (By the way, this is HD video so watch it full screen if you can!)

I am skipping many details between integrating the hardware and flying, but just as a quick overview:

We first integrated the system into a Senior Telemaster.  After 4 trips to the field over the span of 2 days, numerous flights, and a bunch of work in the evenings, we felt like the system was coming together and working every bit as well as it was supposed to.  There …
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Resolution 3: Design Evolution to First Flight

Here is a photo blog showing the progress from initial rough prototype, to final design, to mold making, to test flying the first production aircraft:

Resolution 3: Design to First Flight

This is a project that was sponsored by NOAA to develop a fully marinized small UAS that could be deployed from a variety of small vessels, recovered in the water, and used for marine debris detection or wild life surveys.

The “Resolution 3” purpose built UAS airframe is just one of the really cool products to evolve out of this project.…
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Visualizing Circle Holds

(If it was me, I’d click on the “watch on youtube” icon in the lower right corner and select 480p and go full screen — but that’s just me.)

Flying a continuous tight circle pattern around a fixed ground reference point is about the closest thing we can get to parking an airplane in flight. It isn’t too hard to do a lazy orbit around the point, but we want to keep the radius fixed, even if there is a wind. This means that as we fly around the perimeter of the circle we have to continually vary our bank …
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Real-time UAS Simulation and Visualization

Real-time UAS Simulation and Visualization

In previous posts I’ve described the process of carefully modelling the basic geometry and mass properties of a UAS in YASim to provide a real time flight dynamics simulation of the aircraft in FlightGear.  I also described how we carefully modelled the blended body shape of our UAS using airfoil plots and spline curves.  These curves were then imported into MoI and used as the basis to generate a smooth, flowing, organic surface shape.  MoI is able to export the model as a 3d triangle mesh in a variety of formats including 3ds.

Model Cleanup


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3D Modelling with MoI

3D Modelling with MoI

MoI (Moment of Inspiration) is a really interesting 3d modelling tool.  There are two things that separate it from other tools in my view.

1. It has a very simple and intuitive interface.

2. It has powerful and intuitive primatives for drawing and manipulating curves and 3d surfaces. For example MoI allows you to define 2d (or even 3d) curves and then stretch a 3d curved surface between your curved lines–possibly with additional guide curves to control the shape.  Like with any tool, it takes a little thought, practice, and planning to break down the structure …
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Physics Modelling

Dynamics (Physics) Modelling and Flight Simulation

There are many great tools available to help engineers design and develop new aircraft and flight control systems.  One such tool is the flight simulator.  More specifically: an open source flight simulation such as FlightGear. Being open-source FlightGear is flexible and adaptable and can be used to solve or explore new scenarios that a proprietary software applications may never have anticipated.

FlightGear + YASim

Here I describe the process of modelling a flying wing in FlightGear using the built in “YASim” physics engine.

A brief word on yasim (wiki documentation): YASim …
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3D Modelling … with … Perl?!?

3D modeling with perl?!?  What the…?  Huh?!?

Are you insane?  Yes, but in a nice sort of way (I hope!) 🙂

Since I’ve already admitted to being insane, you won’t mind if I explain the back story that let up to my evil plot.  I work with a small high tech company (ATI out of Wasilla Alaska … and yes if you were wondering, but no I haven’t met her myself.)  Some of the things we do is develop a variety of UAS related technologies.  One project involves developing a marinized (water proof) UAS that can be launched from a …
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