take a look at my other designs https://www.thingiverse.com/mg_evolution/designs
Update December 2018
I have a updated version of this mount with the motor mounted up at various angles.
Wing mounted adjustable motor mount v2
I made this for the FliteTest Sparrow but this can be made to fit any wing with a flat bottom profile.
This should take a 1104 motor as it is.
2mm thread with 9mm between the thread centers 1104
2mm thread with 12mm between the thread centers 1806
I tried a rear mount motor 1806 with a 3D printed part but found on thingiverse but the balance was over 40g at the back even with a 3S 1400mah battery at the front.
The motors sit forward of the COG which i believe is 1.75" back from the wing front.
I designed the motor mounts to be hot glued in using a slot 5mm x 15mm. The cab;es are then run through the wing body to the center where they come out at the rear of the servos.
The only thing i have changed from this printed deign is to open the cable hole to allow cables to be slotted in. This can be seen on the last picture looking at the under side of the wing.
I have to test fly the plane.
I plan on using 4" quad props first of all. This will give minimal clearance when the plane is grounded.
I am open to any questions or changes / ideas you have