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a very small knex gun.
This is "knex gun builders" Mini knex gun from instructables . com.
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Here is a perimeter marble run around my sons room. The track runs around the entire room near the ceiling. The supports are walnut and a majority of the tracks and other parts are birch. Gear motors are run by "AA" battery packs. The marbles are 1 inch diameter.
Go to the following link for more information on the building of this track:
www instructables com/id/Kinetic-Marble-Track-Around-The-Top-Of-A-Room/
**** LINK TO DETAILED INSTRUCTIONS BELOW *****
I am not making rocket or missile launchers anymore but I keep getting request for a tutorial video.
This is just a slide show of the pictures from my written instructions in INSTRUCTABLES.COM. This homemade M72A2 LAW laucher will launch a Nerf Pocket Vortex (discontinued product) about 100 yards. It can also launch mini tennis balls and anything else that will fit inside the schedule 40, 2 inch pvc tube.
I put in as many tips, hints and advice as i could remember to help you build your own air cannon.
Detailed instructions below: