This rocket uses 2 "A,B,or C" engines. I suggest to use a engine with a 0 as the last number first then use a longer second engine. Use supports on the top or head for the rocket but it might work without supports. To build it glue the bottom to the tube, then use masking tape to tape the two engines together then load the in to the tube and make sure that the hole is facing the ground when putting the engines in the tube, then glue the top on and let it dry, next get a straw and tape it to the out side of the head, finally launch it.

PLS TELL ME HOW I CAN IMPROVE IT OR IF YOU WANT IT DIFFERENTLY!!!!