A quick demonstration of the arm transformation feature for the DiY 3D Printed DJI Inspired Quadcopter. This implementation uses a 200 RPM gear motor and M5 (5mm) threaded rod to move the worm block. The quick transformation speed is due to the high motor RPM.
The DiY project is discussed here: http://www.rcgroups.com/forums/showthread.php?t=2327044
My project blog is found here: http://www.rc-cam.com/forum/index.php?/topic/4022-3d-printed-dji-inspired-quadcopter