Oxcart
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The Oxcart 150 FPV quadcopter utilizes a 150mm X-Frame design and targets 3" props. It was explicitly designed around the following components:
RMRC Dodo Flight Controller RMRC Dodo PDB RMRC Cricket V2 5.8GHz VTx RunCam Swift CCD Camera RCX H1407 Motors
RC Groups build log: http://www.rcgroups.com/forums/showthread.php?t=2733031
3D printed parts on thingiverse: http://www.thingiverse.com/Oxcart/designs
The width of the plates at the center is 40mm. The width of the plates at the front/rear is 32mm.