Easy Gas Rocket

hi my name is mayur.this is my first instructable and its a rocket .hope you like it

Step 1: Theory

In this rocket(which can be used as a demonstration of internal combustion engine)derives its power from burning alcohol vapour which is ignited using a spark

Step 2: Materials

you need 
a small soda bottle
a gas lighter
some pieces of aluminium foil
hand sanitizer or pure alcohol

Step 3: Construct

Put a few drops of alcohol in the bottle and vaporise it.insert the lighter into the bottle and secure it (fill the gap using foil of some thickness ) so that it is air tight.the foil is to be rolled round the lighter.And you are done. 

Step 4: Launch It

just press the lighter and the bottle launches