Egg o naut
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Egg-O-Naut. Mario Palmietto. Rules Overview. 1 liter or smaller plastic carbonated beverage bottles. Openings on the bottles must be 2.2 cm inside diameter May bring up to two rockets

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Egg o naut


Mario Palmietto

Rules overview

Rules Overview

1 liter or smaller plastic carbonated beverage bottles.

Openings on the bottles must be 2.2 cm inside diameter

May bring up to two rockets

Labels may or may not be removed. If removed, must be presented at the safety inspection to confirm it is a carbonated beverage bottle

Rules overview1

Rules Overview

The integrity of the pressure vessel must not be compromised, i.e., no hot glue, no sanding, no super glue, no cuts. Acceptable glues are polyurethane based adhesives and tapes

Metal can be used, but may not contact the pressure vessel. No sharp or pointed metal components or rigid spikes allowed on the end

Rules overview2

Rules Overview

No commercial rocket parts

All rockets will be launched using the launcher provided by the supervisor

All fins and other add-ons must be at least 2 cm above the level of the flange on the bottle’s neck

All energy will be from water/air pressure. No other potential kinetic source of energy is permitted

Samples of launchers

Samples of Launchers

  • NERDS Inc.

  • Pitsco

  • Make your own…

Rules overview3

Rules Overview

The supervisor will provide the egg and it will be marked in a way that will insure that teams are using the eggs provided.

Rockets must be built so that the egg is easily removed. Nothing may be adhered to the egg.

Rules overview4

Rules Overview

The rocket and each part that is intended to separate must be clearly marked so that it can be identified by the team and judge.

The part of the rocket containing the Egg-o-naut should be brightly colored if it is to detach from the rocket.



Teams must bring and wear spectacles/goggles for loading, launching and retrieving their rockets and Egg-o-nauts. After inspection of each rocket, teams will receive 1 egg per rocket, add water and load their egg in the rocket.

Once called to launch, teams will have a total of 5 minutes to launch 1 or 2 rockets (only 1 launch per rocket). Teams may launch second rocket before retrieval of first egg-o-naut.



All rockets will be launched at 60 psi. Once the rocket is pressurized, students may not touch or approach the rocket.

Time aloft will be recorded to the nearest hundredth of a second. Timing starts when launched from the launcher and stops when the Egg-O-Naut or portion of the rocket containing the egg touches the ground, comes to rest on a tree, building or other obstruction, or goes out of sight. 3 timers are preferred.



Teams will retrieve their rockets and show the rocket or capsule with the Egg-O-Naut to an event inspector. The Egg-O-Naut capsule or wrapping must be opened in the presence of an event official.

If the Egg-O-Naut or portion of the rocket containing the egg that completely detaches from the pressure vessel will receive a 3 second bonus. Any type of free fall recovery system is allowed.

Rocket parts that do not remained linked while aloft will not be disqualified or penalized.



Egg-O-Nauts that can be retrieved and survive will receive a 15 second bonus. Survival is defined as not cracking the egg enough to leave a wet spot on a paper towel. If the Egg-O-Naut cannot be retrieved, it will not receive the 15 second bonus

The rocket score is the time aloft plus the bonus seconds for the Egg-O-Naut capsule separation and bonus seconds for the survival. The rocket with the best time will be the score for the team



  • Construction violations will be scored as followed:

    • Rockets that violate a safety related construction rule will not be launched and will receive only participation points

    • Teams having other construction violations will be ranked below other teams

    • Tiebreakers will be the better score of the other rocket

Recovery systems

Recovery Systems

  • Parachutes

    • SHAPE: Round, Rectangular, Airfoil… which is best?

    • MATERIAL: Plastic (dry cleaning bags, tablecloth, drop cloth), Paper, Space Blanket, Cloth???

    • CONNECTION: More strings or less?

    • DEPOYMENT: Passive or Active?

    • PACKING: How to fold the chute

  • Consistency is key!

Rocket key points

Rocket Key Points

  • Primary Principles

    • Center of Pressure

      • Point that is aerodynamic center. This is the point where the aerodynamic forces acting on the rocket in front of this point is equal to the forces acting behind this point during normal flight. Calculated through wind tunnel or driving with rocket out window of car

    • Center of Gravity

      • The point at which the rocket balances

    • Center of Lateral Area

      • Point along the rocket where if you attach a pivot and hold in the wind it would neither point into or away from the wind

Rocket key points1

Rocket Key Points

  • CLA, CP & CG Relationship

    • CLA and CP are nearly the same for short fat rockets

    • The CLA and CP are far apart in long skinny rockets

    • The CG must be above the CP for stable flight

    • The CG must be below the CLA to prevent lawn darts

    • To increase thrust, increase CP

    • To increase fin area decrease CP

    • Lower fins decreases CP

    • Raise fins increases CP

Rocket key points2

Rocket Key Points

Raise fins will increase CLA

Make longer rocket increases CLA

Reduce fin cross area increases CLA



  • Nationals Science Olympiad


  • NASA


  • Back glide Construction


  • General Resource and Information



  • A Construction site


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