Quad Copter APM with modular system

thingiverse

My last quad crash resulted in a ruined frame and props, but the electronics were unharmed. The current quad is built using .5 inch square dowels, with a modified top based on my modular system for easy component swapping. To avoid cleanup issues when replacing parts, the square dowel holes in the components are made taller. The landing gear pieces, made of thin material designed to break as a weak point, can be placed centrally or on the arms due to their compatible screw spacing. My frame weighs 260 grams as seen in the attached photo, with an overall weight of 920 grams including a 2200 lipo battery, as demonstrated in the video below. The build includes one Quad Bottom, one Quad Base Top, four Landing Gear Arms, four Quad Arms (motor mounts), one Battery Strap Base, four ST2210 motors, four 8045 props, one Qbrain 4x20 ESC, an APM 2.5+ GPS with power sensor, a 900Mhz Telemetry Module, and a FrSKY 4 channel CPPM receiver. The maiden flight can be viewed at http://www.youtube.com/watch?v=7ptw4CZ74e0, and the parts were printed with 20% infill ABS using Slic3r with 3 perimeters.