Phantom FPV Flying Wing

Parts List

Airframe

Accessories

Autopilot Electronics

  • Pixhawk (or PX4FMU + PX4IO) Kit
    • Include power brick (choose the XT-60 variant)
  • 3DR GPS (buy as kit option)
  • 3DR Radio (buy as kit option)
  • Optional: PX4 status led for status indication

Optional

Wiring

Pixhawk port
MAIN 1 Left elevon
MAIN 2 Right elevon
MAIN 3 EMPTY
MAIN 4 Throttle

PX4 FMU Build Log

Pixhawk build log with SF02/F laser altimeter below.

This build log shows a FMU 1.7 + IO 1.3 setup with 4200 mA 3S for enhanced flight times.

Step 1: Build the Plane

Building the plane is very simple: the two wings are glued to the side, the fins are clued to the back, and do not forget to glue in the carbon fiber tube. The plane comes with unidentified foam glue. If you prefer to know what you're working with, use of UHU POR is recommended. Hot glue (Pattex, do *not* use random cheap hot glue from the next DIY store) works fine too, but you have to have some experience and be quick.

Step 2: Attach the servos

The kit comes with the servo linkage, but the holes in the servo horns have to be widened slightly.

Step 3: Plan the internal layout

Put all components into the plane, but do not fix any of them yet. The picture shows a potential placement. Things to optimize for are:

  • Keep a maximum distance between transmitting components (3DR radio) and GPS and RC receiver
  • Keep a maximum distance between high-current paths, including the ESC, and the autopilot
  • Damp the autopilot against vibrations (e.g. using Latex foam, like the popular DuBro-Foam)
  • Put the battery with lead-less side to the front and pad it against impacts

Normal velcro is convenient, but does not provide a tight fit. 3M Dual Lock however is easier to detach, and keeps the attached items nicely in place.

The internal bay has now been populated with dual lock, one in the center for the battery, and two on the sides for peripherals.

To update firmware the micro USB port has to be accessible. The side can be cut on this position easily and without inducing structural weaknesses.

This image shows the final layout with all components in place.

Pixhawk Build Log

This build log is for Pixhawk with PX4 airspeed sensor and LightWare SF02/F 40m laser rangefinder. We start with the empty airframe which just has the airspeed sensor populated.

The airspeed sensor mount has the benefit of not catching grass on landings. It is documented on the PX4 Airspeed Sensor page.

Final result with everything mounted, but missing flow sensor and laser range finder protection shield.

SF02/F Range Finder and PX4FLOW Setup

To start these two sensors, please add a file called etc/extras.txt to your microSD card with this content:

sf0x start
mavlink start -d /dev/ttyS6 -b 115200 -m custom
mavlink stream -d /dev/ttyS1 -s OPTICAL_FLOW -r 2

Plug PX4FLOW (UART3 of PX4FLOW) into SERIAL4/5 of Pixhawk using a 1:1 direct 6 pos standard PX4 serial cable. Plug the SF02/F into TELEM2 of Pixhawk. The wiring of the SF02/F is explained on the Rangefinder page.

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