How to a Water Rocket using up to three 2-liter bottles connected in series?

Question

Obtaining maximum altitude is only part of the competition. Landing the egg intact could be accomplished by a variety of methods, however the egg must travel with the rocket until reaching maximum height. Afterwards, the egg may be jettisoned from the rocket or may continue on the flight down. Explosive charges are not allowed.

Answer 1

The three bottles need to expel at the same time and at the same rate. The column they are attached to shall maintain a consistent flight pattern.

When the propulsion has finished the descent needs to have the egg extract away with a parachute to bring it safely down.

The propulsion o*****e is critical to create the best force for the longest amount of time.

Use the DOE, design of experiments to determine the optimum configuration.