This is definitely one of the best helicopter hobby projects you are going to come across. This tri-copter is not only extremely versatile, but the project how-to is laid out in great detail as well. It’s an open source tri-copter that is now in its 4th generation. It not only flies well and hovers, but it can also do aerial acrobatics like loops and rolls. The airframe is modeled with carbon fiber coated balsa wood (thus light and strong). In the hover mode, the helicopter can perform level flights on its own. On the “acro” mode and watch it do the spins and loops.
Three gyroscopes and a dual axis accelerometer for control make up the main parts. The tricopter is programmed in BASCOM and a GUI helps to view and modify all relevant settings and upgrade the firmware.
The developer’s blog not only gives the instructions and source files (free downloads), but it is also worth a read for how the project moved from prototype to a working model. The tri-copter comes in two versions – the standard and the micro.
The micro-copter is small enough to sit in the palm of your hand, yet powerful enough to lift a 1080p HD camera!