The Clawson Middle School Robostangs had several successful prototype tests this weekend, including a rubber-band intake (https://youtu.be/yNHzL7kup8c) and a catapult with the ability to easily shoot up to 30 feet… obviously overkill for NBN ([https://youtu.be/Wm_uR5KJU9U).
The idea of the intake is fairly obvious. We originally tried using plexiglass, however the ball would constantly bind behind the table (we were testing on) and plexiglass, due to the high grip on the test balls. We tried rubber bands because of their grippy texture and their ability to form around the ball. We were extremely happy with the result.
The idea of the catapult is to simply use rubber bands that release the tension and shoot the ball… like most catapults. To hold the strength of 16 rubber bands, we used a gear ratio of ~1:19 in order to mechanically lock the arm down using pneumatics (not shown). We consistently shot to about 30 feet… clearly overkill. We are continuing to design and plan the mechanism to feed and reload the catapult.
Let us know what you think!
NOTE! *******Ensure that safety is stressed when testing these shooters… whether flywheel, catapult, etc.; these mechanisms are extremely powerful- so please use extreme caution.](https://youtu.be/Wm_uR5KJU9U). )