You will need a Pen,, plasticine, rubberbands, a cup and six popsicle sticks. lay the sticks in a triangle and glue. Coonect other sticks to creat apyramid and glue. Put 3 hole in the cup evenly spread. Knot rubberband in cup holes. Rubberband the cup until it is airborne. You can use your catapult.