How do I prepare my multi-stage rocket for flight?
Use cellophane tape to tape booster engine on the bottom to the upper stage on the top together. Wrap masking tape around rear of upper stage engine and front of booster stage engine to friction fit into the engine tubes. Push upper stage until it stops against engine block and fits snugly. Slide booster stage onto assembly until booster engine stops against the engine block. Continue preparing the booster engine with an igniter for launching.
