Project: Skybound
Materials: 2 bottles of the same size, chunk of cardboard (for fins), stuffing/padding, and and egg (◕‿◕) .
In STEM, we worked on making bottle rockets to launch an egg into the air inside the rocket and land it. It worked because of Newton’s 3rd law of motion: For every action, there will be an equal and opposite reaction. We also found the formula for fins on the rocket (D=diameter) root: Dx2 span: Dx1.5 tip: Dx1. The system for the rocket to work was the bottle itself. A subsystem was the fins. The rocket would not go straight without them.
What worked really well on or project was the padding. Our egg survived the launch. It made it survive because it absorbed shock when it landed. What also worked well was our wings. The wings helped create a tiny bit of drag in the back so the back wasn’t flipping around midair. What we might improve on the rocket is to make the wings evener. Even though it really wouldn’t help performance, it would make it look nicer and neater.
When in the making of this project, I cut the wings to size from a chunk of cardboard to size. I also brought the bottles for the rocket. We used 20ml bottles (16.9oz). I also brought cotton balls. I stuffed the cotton balls into the rocket top with our egg in it. Then I hot glued the rocket together and glued many cotton balls onto the top of the rocket to absorb shock from the impact. Then I glued the fins on. I put many layers of glue onto they fins root area to make sure they stay in place.
What I learned in this project was how to make fins for a rocket [(D=diameter) root: Dx2 span: Dx1.5 tip: Dx1.]. I also learned that the center of gravity on the rocket needed to be above the center of pressure.
(I also learned how easy eggs are to break (╯°□°)╯︵ ┻━┻) The last thing I learned was that the impact force of over 100 feet was enough to implode the top of a 2 liter bottle.
What worked really well on or project was the padding. Our egg survived the launch. It made it survive because it absorbed shock when it landed. What also worked well was our wings. The wings helped create a tiny bit of drag in the back so the back wasn’t flipping around midair. What we might improve on the rocket is to make the wings evener. Even though it really wouldn’t help performance, it would make it look nicer and neater.
When in the making of this project, I cut the wings to size from a chunk of cardboard to size. I also brought the bottles for the rocket. We used 20ml bottles (16.9oz). I also brought cotton balls. I stuffed the cotton balls into the rocket top with our egg in it. Then I hot glued the rocket together and glued many cotton balls onto the top of the rocket to absorb shock from the impact. Then I glued the fins on. I put many layers of glue onto they fins root area to make sure they stay in place.
What I learned in this project was how to make fins for a rocket [(D=diameter) root: Dx2 span: Dx1.5 tip: Dx1.]. I also learned that the center of gravity on the rocket needed to be above the center of pressure.
(I also learned how easy eggs are to break (╯°□°)╯︵ ┻━┻) The last thing I learned was that the impact force of over 100 feet was enough to implode the top of a 2 liter bottle.