1 22mm pipe any lenth over 15cm
1 plywood or you can use plastic. (to hold the bottle in place)
1 inline non return valve..... One from a ballon pump will do
1 a 1st stage of a bottle rocket and a 2nd
1. insert 2cm of the 22mm pipe in to the 1st stage. ( pic1)
2. use epoxy or pvc sement to seal it. (pic 1)
3. insert a non return valve into the pipe and glue it.
3.work out the dimensions of how long and wide the plywood or plastic needs to be, to hold the bottle in place. Then cut it out using image 2 to help you. The hinge is mounted on the pipe clamp.
4.when you slide the bottle on (use vaseline to seal it) make sure the pipe clamp is right next to the neck on the first stage. This will have your hinge on, next clip your hinge onto the bottle neck so it is tight and won't fall off.