-Note 1- This is not made out of 100 percent duct tape.
-Note 2- For this instructable it really helps if you already know how to throw a working boomerang
-Note 3- Works in little to no wind only.
-Note 4- In hot weather the boomerang often becomes quite flimsy, and will most likely not work
Step 1: Materials and Tools
-Duct Tape (I used colored duct tape)
-Flexible Cutting boards(you can buy a pack of three at wal-mart for 3-4 bucks, and each board can fit 4-5 boomerangs)
Step 2: Make an Outline for Your Boomerang and Cut It Out
Step 3: Adding Duct Tape and Making the Airfoils
Start by adding one strip of duct tape across one of the wings, and do the same on the other wing. Now add the duct tape in the same way but on the back of the boomerang). Go ahead and cut off the excess duct tape. Keep on adding and cutting the duct tape until it is the desired thickness (this varies on the boomerang, however usually 2-3 layerst) of duct tape on either side 4-6 layers total will do it. To find out how thick you need it start by adding two layers of duct tape, and test it (see next step), if it ends up needing more just add more until it is perfect .(although in the pics the duct tape overlaps in the corner of the boomerang I have found out that having some of the layers not overlap helps to keep the boomerang lighter and better balanced thus improving its functionality)
Next bend the boomerangs wings to make the airfoils. See the picture with the orange and white striped boomerang to see which way to put the airfoils(The airfoils in the picture are for people who throw with their right hand. If you throw with your left hand just make all the airfoils go the other way)
Step 4: Testing
If your boomerang isn't working, it is probably one or a combination of these four things-
1- You aren't throwing it right (not putting the right amount of spin or/and power, throwing it at the wrong angle, etc.)
2- Your boomerang design isn't working (wings could be too small or to big, or it could be the shape or pattern.)
3- It is too heavy in which case remove some duct tape.
4- It is too light in which case add more duct tape
If it works however decorate(if you want) and have fun!!!
Step 5: Decorate -Optional-
Use different colored duct tapes and permanent markers to decorate your boomerang (see pictures)