how to make a rocket launcher in mc 1.8

1.make a stone tower about 5 blocks above the ground

2.next make a stone ring thingy

3.put a dispenser inside the ring's hole at the most deep part

4.put water in front of the dispenser

5.then at the end of the ring put a sign so the water wont flow everywhere

6.put a lever/button on the dispenser

7.finally put fireworks inside the dispenser
                                                                     
THERE YA GO TIME TO 'POP' UP 'FIRE'! <unnecessary bad pun