How to make a catapult - with pictures
This simple design allows for a quick Saturday build and will be fun for the kids.
*Just a warning. This catapult has moving parts that release suddenly. Use caution and stay clear of pinch points and swing radius of all moving pieces.
What you need for this catapult
Spring hinge
2x4x8’
Bolts and nuts or lags
Saw
Hot glue and gun
Nails
Wood Glue
Drill and bit
Dads Fun Meter Score:
If you have more than one kid, they will fight over whose turn it is.
This can be turned into a corn hole type game.
The kids will most likely ask to help in the garage.
The kids will play without your for a few minutes!
We score this activity an 8.5 out of 10.
Catapult building Instructions
Step 1 - Cut the 2x4 into 2-1 foot sections, a one and a half foot section, and 1-2 foot section
Step 2 - Attach the 2 foot 2x4 to the 1 foot 2x4’s with glue and nails. Leave enough room to mount the spring hinge to the underside of the 2x4.
Step 3 - Pre drill a hole to fit your bolts or lags
Step 4 - Bolt or lag the spring hinge to the underside of the 2 foot section of 2x4. See Step 1 picture for a visual reference on placement.
Step 5 - Hot glue the paper bowl to the 18” 2x4 section at one end. The base of the bowl should be completely on the 2x4 but as close to the edge as possible.
Hot Glue the Bowl to the 2x4
Pre Drill and Install Lag or Bolt and Nut
Step 6 - Pre drill a hole to fit your bolts or lags.
Step 7 - Bolt or lag the opposite end from the bowl to the other side of the hinged spring.
Step 8 - Insert a ball and watch it fly.
Pro Tips
The tension on a spring hinge can be adjusted. See the instruction from the manufacturer for your hinge.
The glue can be omitted but it will last longer with glue
You can change the angle of trajectory by changing the stopping point of the hinge. Try inserted a wood block 1" wide vs. 1/2" wide. What changed? Have your kids explore the science of the moment (a moment is the point at which an axis pivots).