Do you want to make a marble cannon that looks cool and is a lot smaller/easier to carry. Well I will tell you how to make a Nerf Marble Canon.

Supplies

Need

Nerf Gun
Wood/Platform of Some Sort
Marbles
Super Glue
Box/Pillar of Some Sort
Tape Measure
Ruler
Wingnuts
Brackets
Bolts
Wood Screws

Optional

Paint
Saw/Something to cut platform with
Spring
Spoon

Step 1: Get the Supplies

First you get a nerf gun. I recommend getting a cheap one from the Dollar Tree, though you could get a different or much larger nerf gun. If you go the Dollar Tree route I suggest getting a couple different nerf guns to see which would benefit you more.Then wherever you get your Nerf gun make sure to get a platform to put the Nerf gun on, super glue, pillar of some sort to put under your platform, tape measure, ruler, wingnuts, brackets, screws, and bolts. Then finally get your marbles, paint, spring, spoon, and a saw or something that can cut your platform, This will make it possible to decorate your finished product and make it have more uses, while also making it easier to use and carry around.

Step 2: Put It Together

Use a generic Nerf gun from The Dollar Tree. If the opening is too small to insert marbles. Remove part of the plastic from the opening of the barrel this makes it possible for the marbles to fit into the chamber. The Nerf gun I used relied on a spring and air pressure to fire a Nerf dart. The air pressure was not strong enough to fire a glass marble. If this happens to you disassemble the Nerf gun using a screwdriver and remove more plastic parts as well as an O-ring that was originally used to maintain the air-pressure. You should find that the spring alone is sufficient to launch a marble. Then grease all moving parts with a small squirt of cooking spray or something similar. This will help to reduce friction allowing the moving parts to move faster. Doing all of this will give you a Nerf gun that can fire marbles. After this get your brackets, wingnuts, wood screws, and bolts. and attach your Nerf gun to the platform you are putting it on. Begin by drilling a hole through the bottom of the Nerf gun and using the wood screws to attach the Nerf gun to the wood. Then attach your brackets and wingnuts, to be able to adjust your new Nerf canon. The wingnuts will allow you to tighten and loosen your canon making it easier to use, while the brackets will help attach the canon to the wood.

Step 3: Decorate It

Get that paint, saw, spring, and spoon. Begin by painting the platform you put your canon on. Then cut the pieces of the platform that are not needed/in the way. Get your spring and and drill, then drill a hole next to the canon, but not to close. Attach your spring in the hole, then place a spoon in it. WALAH a Nerf Marble Canon that also has a cool slingshot/catapult. Now that you have your final product you can test it.

Step 4: Test It

Grab your finished design and place it on the pillar you got for it to increase the height the canon goes. Then pull back the trigger, aim, and FIRE at your target. Now you have a Nerf Marble Canon.

Step 5: Calculations

These Calculations show the height in which the Nerf Canon launched the marble, the angle the canon was launched, the distance it was away from its target, the time it took to land, and the initial velocity of the marble. The time could have also been solved by using the equation t =|/2(y-xtan^-1)/g Which would be 2 multiplied by the negative of the launch height minus the distance the marble traveled times the angle that marble was launched divided by the gravitational acceleration of -9.8m/s^2