Green Goblin - Custom Flying Wing

Hey it's Lee from AudaciousRC, and I just wanted to tell you guys about a custom flying wing I just built, called the Green Goblin. I put it together from a few parts I had intended for another project. Here's a video where I go into detail about the components and construction after a short cinematic: 

Components

Motor: Turnigy D2822/14 1450KV

Battery: Zippy Compact 4s 1000mAh

ESC: Hobbyking 30A w/BEC

Prop: 7x5

Servos: Turnigy 9g

Receiver: OrangeRX FASST 8ch receiver (for those who fly futaba 14sg, this is basically the cheapest receiver you can find)

Motor Mount: 3d printed from thingiverse

Basic Dimensions

Root Chord: 10"

Tip Chord: 6"

Sweep Angle: 21 degrees

CG Calculator

 Construction Methods

I built this wing a little bit differently than other wings I've built in the past, like the versa and the versa blunt nose. I'm a little bit of a perfectionist, so I don't like seeing exposed foam in my builds, and I like everything to look good. While perusing YouTube I stumbled across a timelapse of a build by SkyBusterPro, which inspired me to build this plane differently. What he did was instead of cutting, folding, glueing, and THEN taping the plane, he cut out the foam, then covered it in wing tape, then he folded and glued it. This makes it much easier to tape the plane, and also makes everything look cleaner.

Here is a step-by-step process of my methods. I forgot to take pictures of my green goblin during construction, so I made this little wing as a demonstration of the procedure.

1. Cut out both wings, leaving main fold intact

2. Tape one side of wings together

3. glue seam and tape other side

4. Tape entire wing, starting on outside edges and working towards the middle.

5. Cut excess tape from the edges.

6. Cut 45 degree bevels in main fold

7. Insert spar, cut out creases for the airfoil.

8. Glue inside creases and fold over edge

9. Glue inside main fold, on spar, and at the trailing edge and fold over the wings

10. Cut out excess

11. Cut slot for propellor

12. Glue and tape over edges

13. Cut out and tape elevons and vertical stabilizers

14. Tape on elevons, leaving a gap between the trailing edge and the elevon to allow movement

15. Glue on vertical stabilizers and tape down the center line with a heavy tape. 

One final tip for building wings is to mount everything you can on top, try to cut as little into the foam as possible, especially in the center, or you risk losing your structural integrity. I only cut slots for the motor mount and battery, and mounted the servos vertically to save space. 

Elevon with no foam exposed. 

Midair Collision

I happened to have a little bit of a crash with a fellow rc flier at one of the university's fields. There were about 6 or 7 of us out there, with mostly flying wings, and things were pretty crazy. Both of us were turning into each other, and we collided, wing to wing. My plane kinda dropped, kinda flew, to the ground and landed flat. After close inspection of the plane, I noticed that only the leading edge had crumpled a little bit, and no other damage had been inflicted.

His plane, on the other hand, exploded into a bunch of pieces, shearing the wing off, snapping the spar, and tearing out the servo wires. His was a popwing made of EPP. I guess it just shows how strong a homemade foam, tape, and glue wing can be. 

Build Plans

I have attached PDFs of the plans, one for each wing. This is my first time making a full scale set of plans, so let me know if it works for you. It is full size, so the rectangle around the design is the full 20" by 30" foam board. 

Left Wing-Full Size

Right Wing-Full Size

Thanks for reading, I hope this article was helpful for you. Don't forget to check out our channel, AudaciousRC, on YouTube! Leave a comment below with your thoughts on the build!

Thanks,

Lee Morris from AudaciousRC