Flasher, Logic and Timer circuit

[clurt]

Long story short I am building a bottle rocket at uni.

As part of launching this rocket we are using a flasher, logic and timer circuit.

Can you please explain the basic role that each of these circuits, and an overview of the circuit as a whole.

Help is much appreciated.

 

[clurt]

EDIT we are not using a flasher circuit, just logic and timer.