This is an Instructable on how to build a catapult powered by a mousetrap. It can shoot a variety of things but I specialized mine to shoot practice golf balls. I used a weaker mousetrap, and it shot about 15-20 feet.
Step 1: Materials
For this project, you'll need:
-wire clothes hanger
-an electric (preferably cordless) drill
-the proper drill bit for your screws
-a small block of wood (I used a 10.5x3.5 inch block.) This is mainly to mount the catapult on, and anchor it down.
-needle nose pliers (with a wire cutter).
Step 2: Preparing your materials
First, we'll start with the mousetrap. Remove the tagged items until all that is left on the mousetrap is the spring and the hammer (the part that traps the mouse). Next, on the hammer, clip the end of it on the side that the spring isn't connected to. Straighten this out completely so there is an arm connected to the spring.
Next, on the clothes hanger, you want a piece of the wire to be about 1 foot, so cut on the two tagged spots.
Step 3: Drilling!
Hold your mousetrap down to your block of wood. You need to leave space for the arm to be pulled back, so attach your mousetrap closer to the front. Drill two holes through both the block and the mousetrap. Do them in the center of the front and the center of the back on the mousetrap. Next, get out your screws and change your drill bit to a Philips head. Put the screws into the guide holes to tighten down the mousetrap. Your catapult is now working, but we need to tweak it a little to improve it.
Step 4: Extending the arm (lever extension) and adding the lever holder.
Basically duct tape the wire from the clothes hanger to the arm of the mousetrap. With the pliers, bend it into the shape of the object you plan to launch, but make it loose fitting on the object.
The tag on the nail has its instructions.