Vinegar and baking soda

VINEGAR & BAKING SODA BOTTLE ROCKET!!'

EQUIPMENT:

• A 1.5 liter soda bottle
• 3 pencils (Un sharpened is best)
• Duct tape
• A cork that fits the soda bottle
• Paper towels ( optional ) 
• Baking soda
• Vinegar

Method:
1) build you rockets stand.. tape the tree pencils around the top of the bottle making sure that it is secure and can hold its balance. 
2) take your rocket outside and add in your baking soda and vinegar in, give it a good swirl.
3) quickly but carefully put your cork on, make sure it is on properly but dont put it on to tight or it wont work... stand back and wait for your bottle to explode this could take about 30 seconds.