Don't throw away pizza boxes, make them into airplanes.

What you need:

1+ pizza box/boxes (with as few grease stains as possible)

1 keychain ring (circuler metal thingy)

Scissors (preferably sharp and big)

Tape (duct, scotch, blue, anything)

Ruler (trust me you'll need one)

String (sorry it wasn't here before)

(I beg you to look at the comments)

Step 1: Body

Cut out a piece of cardboard roughly this shape.

From one side to the other it measures about 14"

This is your body,

next is the wings

(don't pay attention to the slits :] )
Hey, this is amazing model. I like it very much - the form is simple, original, construction too. Viva pizza airplane!
For the slits, you can try altering the angle of them, for more lift, which should in theory keep it up longer.
Not necessarily, if the angle is too steep the plane will stall, then fall. May be better to have a smooth flight in descent, than a sporadic flight ascending a little then descending a lot.
Wow did you take airplane physics! I'll try it!
This is a great Instructable. Anything that encourages experimentation with flying is a great project. This one gives you new materials every Friday night! As he said, use your brain and do it. This doesn't cost much and nothing is going to break. Just do it. Experiment with slit placement forward and back as well as wing and tail slit angles up and down. You might not need to add weights if everything works out right. You could also tape a vertical tail to the top or bottom at the back. Try different sizes of fuselage, wing, and tail. There is no right or wrong answer. Every plane will have good and bad features. Just do it.
Nice instructable, despite the blur pictures (look <a href="https://www.instructables.com/id/How-to-take-clear-pictures-for-Instructables-with-/)">https://www.instructables.com/id/How-to-take-clear-pictures-for-Instructables-with-/)</a><br/><br/>I think the string must be UNDER the wings, because the wings tends to lift.<br/><br/>Besides, the balance of the frontal counterweight is very simple to achieve: put a finger under the average line of each wing, and the fuselage (aircraft body) should remain horizontal. <br/>
He might have put the string on top to maintain dihedral angle for roll stability. You still might want a string underneath to keep the dihedral more or less constant. String was not mentioned in the list at the beginning.

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