A Rocket has 6 basic parts:

1. Fuel Area - For us that is an empty 2 Liter Soda Bottle.
2. Cargo Bay - If you want to Launch “something” (maybe an Egg) Cut the top and bottom off of another  2-Liter Soda Bottle and tape it to your Fuel Area.
3. Nose Cone - This is where your Parachute goes.  Cut the top off of a third 2-Liter Soda Bottle. Place it on the top of the Fuel Area (or Cargo Bay, if you have one). DO NOT tape it down. Add Weight to the very tip of you nose cone…Why? (Watch out for Newton’s Law about inertia)
4. Parachute - Cut a large circle out of a plastic trash bag. Put tape on the edge where you want to attach the guide strings. The parachute must return ALL rocket parts!
5. Fins - Fins help the Rocket go straight. Tape 3 or 4 Fins to the bottom of your Fuel Area
6. Fuel - We will use water and pressurized air to propel our rockets into the sky!

 Derby Rules 

• No Metal Parts!
• Air Pressure will be the same for everyone. 
• The boys pick how much water they want to put in. (about ¼ full works best). 
• Judges will time the flights.
• Flight Time will start at launch and ends when  any part  of your rocket returns to earth.
• Returning an UNCRACKED Passenger adds 5 seconds to your flight time.