A Mini steel ball shooter called the " slingatron". It is very powerful for it's small size.
The motor I used was a motor from a small portable vacuum that wasn't good anymore but since I was using a 18v battery that was 54 Mw it made the motor turn really fast !
WARNING: This video is for educational purposes only. This may be dangerous if not used properly. In many cases, these projects are very dangerous and pose risks of personal, or property damage, injury, and in some cases, death. There are very possibly other risks of which I am not fully aware. Use of video content for personal projects is at your own risk.