Egg Drop Assignment

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Postby theexp » Thu May 18, 2006 7:02 pm

In my physics class, we need to construct a device without a parachute, wings, foils, etc. That can make a raw egg survive from a drop of about 20 feet. We can only use straws, tape and glue. anything with those words in it can be used like, duct tape, glue gun, etc. Any suggestions.
I was thinking of making a frame of straws, then making little "airbags" from duct tape, to cushion the egg. Just brainstorming
Any suggestions would be awsome.
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Postby rehab ralph » Thu May 18, 2006 7:38 pm

What I used was a piece of the foam noodles that you swim with in a pool. I cut the piece open (it was like a 5" piece) and i took a spoon and dug out an impretion of an egg. Stuck the egg in the whole and taped up the foam. It was 5"x3" and it survived a 20 foot drop 5 times in a row. I got extra credit because it was the smallest to survive.
rehab ralph
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Postby jasonsmithmyer » Thu May 18, 2006 7:39 pm

This is unrelated to your materials, but my girlfriend completed said assignment by stuffing the egg in a jelly donut and putting it in a ziploc bag filled with marshmellow<sp> puff. Maybe you can find "Glue Donuts" or "Straw Marshmellows<sp>."

The air bag thing didn't work for me and I was using actual balloons.

You could try making a bag out of duct tape and filling it with elmers glue or a dense rubber cement. Things like peanut butter/marshmellow puff work really well because they can absorb alot of smash without implying it to the egg. So maybe with enough thickness to the glue or cement you could suspend the egg in a large 'bag' or muck.

Hope that helps
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Postby BewareOfDog » Thu May 18, 2006 7:44 pm

Suspend the egg inside the middle of a huge glob of <b>straw</b>berry jello gelatin !

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Postby spudman029 » Thu May 18, 2006 8:01 pm

ok. first off, is there a size limit. like a certain in^2? i did this in enrichment and our egg not only won, but survived about a 15 foot drop, thrown straight down at the ground with no parachute. Here is what you do.

materials needed:

1 4"white styrofoam ball(hobby lobby has them for 2 dollars)
1 small sheet of bed foam(the kind that they put in gun/pistol cases, it comes in 1foot square sheets at hobby stores)
5 medium rubber bands
2 wooden barbeque skewers
1 black trashbag
1 roll of yarn

Ok, so basically you fit the egg in the center of the ball, which is suspended by the parachute. Here is a diagram and some steps to make it.


1. take one of the skewers, and do your best to shove it directly through that ball, like the earth on it's axis.
2. use a legnth of yarn line the circumference around the ball
3. use the yarn around the ball as a guideline, and cut the ball completely in half.
<img src="">

Now is the part to cut the holes for the egg to fit inside.

4. remove the skewer so that you have the two halves.
5. stand the egg on end, centering it on the hole made by the skewer, then trace around it. repeat on the other half with the other side of the egg.

<img src="">

Now comes the messy part

6. I used a dremel, but a craft knife or scissors will work also. cut along the outline of the egg you traced.

So now you have 2 halves of a foam ball, they both have circles cut into the middle of them.

7. you now want to start chipping out pieces of the middle of the foam halves. this part can be tricky, so take it one small chunk at a time. you eventually want to be able to enclose the whole egg inside the 2 halves, concealing it inside the ball.

8. now that your egg can fit inside the foam ball, you need to make the egg slots a little bit deeper, this is where the padding comes in.

9. make the holes a little bit deeper, and then cut 2 small circles of the soft foam padding, and place them inside the egg slots. this will give the egg alot of padding on impact.

10. to attatch the parachute you make to the ball, you will need a small section of the other skewer and a rubber band. cut off about 1" of the end of the skewer, just make sure it is small enough to fit inside one of the egg slots. choose one of your foam halves to be the "top" half, this is the one the holder will go inside. remember the skewer holes in the top of the ball? push a rubber band through that hole, so it goes in the half and out the other side. now loop the inner part of the rubber band around the small section of skewer, and pull the rubber band from the opposite side. use your finger to push the stick into the ball, so it doesnt interfere with the egg.

11. now put both of the soft foam circles inserted into the egg slots, put the egg into one of the foam ball halves, put the other half on the opposite side, and rubber band it together to your liking.

Here is the finished egg carrier. It will work like a charm, guranteed.

<img src="">

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Postby saladtossser » Thu May 18, 2006 8:02 pm

i had the same challenge once, the one that worked was some thing like


mine was a pyramid like stucture, it cracked

also some smart ass covered his egg with super glue... i personally would have loved to fill it up with epoxy if it was not noticable
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Postby sgort87 » Thu May 18, 2006 9:33 pm

I won mine quite easily with a unique design. It landed right on the target too. Because of its high mass, the air had little effect on it.

We were limited to a 10cm cube and could use anything we wanted. I chose to make a box to those specs and then find some of that Orange Goo soap stuff. I took the soap and put it in a large Ziploc and the egg in another. The egg bag was placed at the top of the soap inside the soap bag and then the bag is sealed. When it is dropped, the goo will allow the egg to move but will give it the proper cushion to not allow breakage.

Try to find a loophole to let you use some kind of goo. Actually, if you can find enough of it, Elmer's Glue should work great for the goo. It will be a pain in the ass but you shouldn't lose. I'm not sure how you could justify using Ziplocs though. Good luck.
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Postby aturner » Fri May 19, 2006 10:29 am

theexp--I think you idea to use duct tape to make some sort of air cushions is a good one. Might also try to set up several layers of straws to create a cushion.
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Postby Ian2accurate » Fri May 19, 2006 2:01 pm

We did this in physics too. Our limitations were that we had about 20 minutes to do it, and only 3 sheets of paper and .5m of duct tape. Ours actually didn't survive the longer drop but we still got the 30/20 on the lab. We basically made a tube, made some padding with an origami box and some paper, put the egg in wrapped in a little bit of paper, and then a parachute on the top. It was pretty good overall but if we had put something on the side to protect it then it would have done much better. I tried to suggest doing it but we were out of time and my partner didn't really care.

One that did well was a design that had a bunch of legs on the bottom and then the egg in a little basket. I think something like that would do well, but its alot different when you have more time and nearly unlimited amount of materials.
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Postby bigred28 » Fri May 19, 2006 4:28 pm

What might work well is building a frame out of straws, and then using either duct or electrical tape to suspend the egg in the middle of the frame prism. that way, the tape will absorb much of the inertia. the main issue with taht would be building a frame out of straws that would stand up to a fall with the weight of an egg in it. maybe taping the straws for rigidity...?
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