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Division:A-Elementary SchoolNC Essential Standards Alignment:Science as InquiryEvent Rules:Trajeggtory RulesEvent Score Sheet:Trajeggtory ScoresheetClarifications:The volume of the box should not exceed 33,000 cm3.  The 525 cm3 in the rules is incorrect.  3/14/18


Teams will build a device on site capable of protecting an egg when tossed horizontally (clearing a barrier) and landing on the floor.


Teams must bring a box of supplies to build the egg protection device on site.  They must also wear safety glasses.  Event leaders will provide raw Grade A Large chicken eggs and barriers.


Teams will be placed in tiers according to whether the egg breaks and then ranked by the mass of the device. Lowest mass wins.

Tier 1: Egg Survives the toss.
Tier 2: Egg breaks on the toss.
Tier 3: Devices, regardless of egg breakage, that violate a competition rule.


Are those air pillow/air bags used as packaging allowed?


May pieces for devices be pre-cut- ie, straws cut to certain lengths, plastic bags cut into parachute shape, holes punched, cotton balls already stretched out?


If a tie breaker is needed, will the second height be within the 2-4 meter range, or could it be higher?

It will be in the 2-4 meter range.  This will be rare, but fun if teams have to move to the sudden death round!

Can students have a drawing/notes/plan/etc written on paper that’s in their supply box?

Engineers work from plans, so our students can too.  No templates on paper of where to fold, tape, etc will be allowed, but if they want to make a sketch or write some notes to help them remember what to do under pressure, that is fine.

How far behind the barrier will the starting line be?

1.5 meters

Can students bring something to write with?

Yes, pens, pencils, or markers are fine to use as tools, but they can’t be used in the actual device anywhere (i.e. a cage built out of pencils would not be allowed).


– If you hold an egg between your palms short ways, when you squeeze it it will break. If you hold it long ways and squeeze, you probably can’t break it. Eggs are stronger long ways, so try to orient it in your device so it will land top or bottom first. This is a great classroom demonstration, but demo it over a trashcan with safety glasses and a trashbag with a neckhole cut in it to be used as an apron just in case your egg has a weak spot.

– The USDA has defined a large chicken egg to be 60 g (+/- 3 g) averaged by the dozen.

– To practice your accuracy without the mess, use a plastic easter egg filled with enough paperclips, clay, or other mass to equal 60g.

– To test if a raw egg will survive impact without the mess, place the egg inside a sandwich baggie before loading it into the device.

– Part of the strategy in this event will be building something that can be easily opened after the toss to check if the egg has survived.

Fast Facts:


Event Resources:

How to Drop an Egg Without Breaking It – Entertainment purposes only, a fun creative thinking activity

Trajeggtory is a combination of egg drop and egg hurl competitions.

Engaging students in the inquiry aspect of an egg drop experiment.


NoneTrajeggtory explanation session – 2017 rulesTrajeggtory demo – 2017 rulesStrong Egg, Weak Egg Demo

Eggs have 2 axes (plural of axis, not a tool for chopping down trees), the shorter weaker one, and the longer stronger one. In events with eggs you want to make sure the egg always receives the brunt of the impact on the stronger axis. Try this demo at home to see for yourself, just make sure you’re not standing over good carpet!!In events that require the protection of an egg, like Trajeggtory, Egg Drop, or Egg-O-Naut, you don’t want to practice with a real egg, that gets messy. Rather, make a fake egg that is the same size and weight as a real one to see how your device performs without having to wash it out each time.