Concept: If motor is on, torque pivots motor, pulling string, straightening spring loaded flap, drone ascends, flying straight. When motor is off, zero motor torque, flap springs outward, causing the drone to turn towards ground beacon and descend.
Wireless chip on drone powers motor ON via mosfet while in range of central ground beacon. This results in an orbit around the ground beacon. Return-to-home can be done by slowly lowering the transmitting power of the ground beacon, or by the battery on the drone airplane lowering both torque and thrust.
This project is on hold because the wireless module I was using was unreliable to gauge approximate distance by RSSI.
Torque Steering Mechanism for Bare Bones Orbiting Drone