Egg-O-Naut by 8ZOi0BQ4

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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
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 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 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

NERDS Inc.

Pitsco

Make your own…
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 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.
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.
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.
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.
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
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
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
 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 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 Points

Raise fins will increase CLA
Make longer rocket increases CLA
Reduce fin cross area increases CLA
Websites
 Nationals Science Olympiad
     http://soinc.org/

 NASA
     http://exploration.grc.nasa.gov/education/rocket/BottleRocket/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/

								
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