This is the print file for the custom EDF motor-mount-ducts that I designed for my 7ft B-52.
It has been updated to work with 2" props, and has motor mount holes for the 1106 size motors.
Here are plans for my 7ft span B-52, powered by EIGHT 1106-4500Kv Gremlin motors. It's a pretty simple build, but for more info visit the forum thread!