These are building instructions for an attachment accomplishing the FIRST LEGO League 2017-2018 Slingshot mission. The based of the robot is LEGO Box Robot Three With Large Wheels and Thee light sensors and one Gyro
Building instructions for the catapult that could be placed over the LEGO Mindstorms EV3 Brick. The idea of the catapult it to throw objects. The fact that it is over the brick makes it very convenient to place the motors below the brick and to use the Catapult.
This robot construction itself was used in the FIRST LEGO League Senior Solutions competition
LEGO Attachment user for throwing/shooting a ball. It is powered with one motor and uses the fact that the parts of the LEGO set could bend. Build and experiment with it. Many FIRST LEGO League competitions have missions that could be accomplished with attachments that throw/shoot