EggONaut

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Egg-O-Naut

• Mario Palmietto

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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

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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

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

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Samples of Launchers

• NERDS Inc.
• Pitsco
• Make your own

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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.

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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.

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Launching

• 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.

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Launching

• 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.

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Scoring

• 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.

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Scoring

• 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

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Scoring

• 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

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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!

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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

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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

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Rocket Key Points

• Raise fins will increase CLA
• Make longer rocket increases CLA
• Reduce fin cross area increases CLA

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Websites

• Nationals Science Olympiad
• http//soinc.org/
• NASA
• http//exploration.grc.nasa.gov/education/rocket/B
  ottleRocket/about.htm
• Back glide Construction
• http//waterrocket.uh-lab.de/backglide.htm
• General Resource and Information
• http//ourworld.compuserve.com/homepages/pagrosse/
  h2oRocketindex.htm
• http//www.et.byu.edu/wheeler/benchtop/
• A Construction site
• http//www.lnhs.org/hayhurst/rockets/