My first Sketchy Physics Cannon

My first Sketchy Physics Cannon

seva
like it says in the title this is my first S.P. cannon. at the start put the piston to 0 .get a cannonball from the bowl like container and carefully put about a queter of the way down. then set the piston at max. ( i think it is 1 , not sure) DONT DOWNLOAD IT STRAIHT INTO SKETCHUP download on computer. PS i am twelve years old
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