Quadcopter is very suitable for maneuverability and slow, stable flight, but it is at the expense of efficiency. [Peter Ryseck]of Mini QBIT quadrotor biplane It brings some of the efficiency of fixed-wing flight without all the complexities usually associated with VTOL aircraft.
Mini QBIT is just a 3-inch mini quadcopter with a pair of wings installed under the motors, turning it into a “tail” vertical take-off and landing aircraft. The wings and nose cone are attached to the 3D printed frame using magnets, which allows them to be ejected in a collision. There is no need for a control surface on the wing, because all required control is done by the motor. QBIT is based on a research project [Peter] Participated in the University of Maryland.This 2017 papers It means that the power used by the test aircraft in forward flight is 68% less than in hovering.
Giving the flight controller a smooth transition from hovering to flying forward can be tricky, but QBIT uses an ordinary quadcopter flight controller running Betaflight to do this. The quadcopter hovered in the auto-leveling mode (angle mode), and then switched to the stunt mode for forward flight. However, when the UAV pitches forward, the roll axis becomes the yaw axis, and the yaw axis becomes the reverse roll axis. To compensate for this, the controller is set to swap the two channels when the switch is switched. For FPV flight, QBIT uses two cameras for two different modes, each with its own on-screen display (OSD). The flight controller is configured to use the same mode switch to change the camera feed and OSD.
[Peter] V2 parts and STL files are sold on his website, but you can download V1 file free. However, control settings are indeed a defining feature of this project, and anyone can implement it in their own build.
For another simple VTOL project, please check [Nicholas Rehm]F-35 running on his dRehmFlight flight control software.