Ping Pong Ball Projectile Launcher

[vania1711]

Allowed materials:
-1 sheet of 8"x8" cardboard to be used as the base
-another sheet of 8"x8" cardboard (that may be cut)
-2 standard paper towel tubes
-10 standard popsicle sticks
-up to 10 rubber bands (maximum unstretched length is 10 cm)
-5 standard paper clips (max length 5 cm each)
- tape/glue**The projectile will be a standard, 38 mm, ping-pong ball and must be launched to long distances from a desk with a height of 76.5 cm (30 in)

I really need help with this please just give me some basic ideas on where to start or some guidelines! thank you!

 

[CWatters]

Here is one way. No idea how it compares with others.

http://www.khanacademy.org/science/projects/Projectile_launcher/v/build-a-ping-pong-ball-launcher