The simplest flying machine, ever!
For this you'll require :
1.A plastic fan blade
2.A bit thick straw
Step 1: The Plastic Fan Blade
In the image is a plastic fan blade.
(I got my one form an old toy)\
Step 2: A Straw
A bit thick straw .
Make sure the thickness is such that it fits into the hole in the plastic blade.
Step 3: Assembling
Fit the straw in the plastic fan blade.
If there is a minor error, sealing tape, or glue might do the thing.
Step 4: Rotation
This step is important.
Make sure that you rotate the straw in the appropriate direction. Else (It doesn't hurt ;-) ) It might not fly!
The rotation should be such that it should push the air down.
Step 5: In Action (Done!)
(I admit that clicking this image was hard!)
After doing the above steps, you'll see your newly made "Simplest Flying machine"