This is not a good rc project for beginners. I just wanted to see if this could be done.
Step 1: Lay-out
Step 2: Wing Ribs
Using this as a guide, I drew out each successively smaller pair of wing cross-sections based on the lengths that were already laid out on wing halves.
I made twelve unique airfoil shapes which were used as patterns to trace and cut out from foam core the top and bottom sections of each wing rib. All cuts were made with an exacto blade.
Step 3: Main Wing Piece
I had an old 20" carbon fiber rod that I used to strengthen the wing. It was glued into a slot cut in the wing, and taped on both sides.
Step 4: Ribs Glued to Main Wing
Step 5: Trailing Edge
Step 6: Motor and Mount Assembly
A small piece of plywood was glued onto the wing to anchor the motor mount securely.
Step 7: Onboard Radio Gear Placement
I knew the general location where everything needed to be based on past experience, but I just guessed where to put everything specifically. I knew if the battery was placed too far back, the plane would be really hard to have balanced without adding more weight to the nose, but if the battery was placed too far forward it wouldn't be protected in a crash.
This set-up worked well in the end, although I did need to add some additional weight to the nose before I felt it was ready to fly. If I was to build this again, I would put the battery just a little closer to the nose, although I would still probably need to add weight to get the center of gravity where it needs to be for stable flight. I found that the CG on the finished wing should be about 5 1/2" - 6" back from the nose, which requires the adding of quite a bit of weight to the nose. (If you build this, let me know how it works for you.)
Step 8: Duct Tape Covering
Step 9: Elevons
Hinges were made to attach the elevons to the wing with 1" strips of extreme tape. A strip was placed on both the top and bottom of each elevon.
Step 10: Finishing Touches
The servos were hooked up to the elevons, and I taped over the open areas to seal up the wing.
I added some foam pieces to either side of the battery hole to help cushion the battery and keep it from sliding around. A piece of tape is placed over the top of it when flying, which makes it easy to remove and swap out when it is dead.
Wing tips were also added, which are necessary to keep the wing stable in flight.
Step 11: R/C Gear Info
Motor - CF 2812
18A Electronic Speed Control (ESC)
1350mAh Lipo battery (3S, 11.1V)
Prop - 7x6E
3mm prop saver
MG90 micro servos