Intructables.com Viking Catapult
Rubber band catapult.
Here you'll find a lot of pictures and a few words about these amazing pieces of "leverage artillery"
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Instructables.com Desktop Catapult
winning egg flinging catapults
Popsicle Stick Catapult Design Instructions
Dan Becker's G.I. Joe / Barbie scale trebuchet instructions.
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Hinged vs. Fixed Trebuchet Counterweight Design R
Effect of Trebuchet Arm Length or Counterweight Mass on Projectile Distance R
Determine which launch angle results in the greatest distance for a projectile. R
The Distance a Trebuchet Catapult Can Throw Projectiles of Different Masses R
What Is the Optimal Release Angle for Shooting a Free Throw? R
Discover which size and material of spherical projectile delivers the optimal (deepest) penetration into a block of foam, when fired from a slingshot R
Distances a Catapult Can Propel Spheres of Differing Mass (Weight), Size and Density R R
How Does the Length of the Arm or Counterweight Mass of a Trebuchet Affect the Distance an Object Can Be Launched? R R
The Effect of Wheels on Catapult Efficiency R
Maximizing the Trajectory of a Trebuchet R
Evaluate how different sling lengths and counterweight masses affect the distance a trebuchet throws a ball. R R
Is the distance of a certain mass when launched by a catapult affected by the potential energy and angle of the catapult? S