Here's a video of the String Launcher in action. It was inspired by a video I saw by Bruce Yeany. His string launcher is beautiful and I knew I lacked the woodworking skills to replicate it, so I just 3D printed what I would need.
Unfortunately I can't share all the details. I don't know were the motors came from. They were in a box of left over stuff from a physics make and take workshop from 10 years ago or so. However, I made this in Tinkercad and you can easily go in and edit my model to fit what ever motors you happen to find.
Print without supports. Mount the motors at wheels. I used a little masking tape around my motors to make them fit snuggly in the holes. Then glue the string guide to the main body as shown in the picture.
I put a layer of EZ Fuse silicone tape around one of my wheels. This helped increase friction and also close the gap between the wheels a tad.
Then wire the motors so that they will spin to pull the string through. I know you could get away with one motor and one wheel that spins freely. I decided to go with two motors to make mounting the second wheel easier/more reliable.
The only other thing to remember is to feed the string through the string guide before you tie it into a big loop.
- How is it possible to push a string?
- Can you use the arc to determine the velocity of the string as it leaves the launcher?
- Does the string fit a model of projectile motion? If so, when does it stop being a projectile?
- Is this related to the Chain Fountain?