It's not only a quadcopter... it's an open source machine!

I have used a 1.kk flight controller along with an Arduino Nano and an ultrasonic sensor to add the feature of altitude hold.

This project describes of a low-cost GPS data logger for RC planes. In a previous project I described how to build a GPS data logger.

I wanted an additional analog control in FlightGear - nice, cheap and compact.

To add the feature of Direction Control using the initial direction as a reference and applying a proportional controller.

i'm making a simple after burner effect for rc plane motorized with electric ducted fan (EDF) with arduino and leds strip

If you want to set up your airplane accordingly to the designer's specification, you need to measure the control surface right angles.