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Water Bottle Rockets

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Modified on 2011/01/31 08:13 by xinara Categorized as Uncategorized

Water Bottle Rocket

Image
Section: Cub, Scout
Requirements Filled: Space Exploration
Theme: Space
Time: 30 minutes make, unlimited to launch

Materials:
  • Two 2-liter bottles
  • Card stock
  • Clay
  • Foam core
  • Duct Tape
  • Scissors/box cutter
  • String
  • Ruler or meter stick
  • Large Plastic Trash Bag
  • Duct or Packing Tape
  • Masking tape
  • Hole punch
  • Fin template 1
  • Fin template 2

Method:
The Fuselauge
1. Cut the top and the bottom off of one bottle, so that the center portion or a cylinder remains.

1. Cut the top and the bottom off of one bottle, so that
the center portion or a cylinder remains.


2. Tape the cylinder to another bottle to create a fuselage (a place to store the parachute).

2. Tape the cylinder to another bottle to
create a fuselage (a place to store the
parachute).


The Cone
3. Use card stalk to create the nose cone. Use the above pattern to create a template for your cone. Roll the card stock into a cone shape and tape. Place the cone on the top of the rocket. Hint: the diameter of the bottom of the cone should be a little wider than the diameter of a 2-liter bottle.

3. Use card stalk to create the nose cone. Use the above
pattern to create a template for your cone. Roll the card
stock into a cone shape and tape. Place the cone on the
top of the rocket. Hint: the diameter of the bottom of the
cone should be a little wider than the diameter of a 2-liter
bottle.


4. Depending upon your project's mass limitations,  place a golf ball sized piece of clay in the tip of the cone.

4. Depending upon your project's mass limitations,
place a golf ball sized piece of clay in the tip of the
cone.


5. Attach a piece of string to the inside of cone and the inside of the rocket body. Secure the string with tape so that it looks like the diagram. Hint: Tie a knot in each end of the string to give it more friction, so it will not slide out, from under the tape.

5. Attach a piece of string to the inside of cone and the inside of the
rocket body. Secure the string with tape so that it looks like the
diagram. Hint: Tie a knot in each end of the string to give it more
friction, so it will not slide out, from under the tape.


The Fins
6. Using one of the 2 above templates, make three fins identical fins from the Foam core.

6. Using one of the 2 above templates, make three fins identical fins
from the Foam core.


7. You may also want to experiment with different shaped fins

7. You may also want to experiment with different shaped fins


8. Tape the fins to the rocket. Be sure that the fins are spaced equally around the rocket body. Hint: Equal spacing can be achieved by using a piece of string. Wrap a piece of sting around the bottle, mark where the string meets the starting end. Remove the string from the bottle and measure the length of the string on a meter-stick or ruler. Divide the length of the string by three and mark it in 3 equal segments. Place the string back on the bottle and mark each segment on the bottle.

8. Tape the fins to the rocket. Be sure that the fins
are spaced equally around the rocket body. Hint:
Equal spacing can be achieved by using a piece of
string. Wrap a piece of sting around the bottle, mark
where the string meets the starting end. Remove the
string from the bottle and measure the length of the
string on a meter-stick or ruler. Divide the length of
the string by three and mark it in 3 equal segments.
Place the string back on the bottle and mark each
segment on the bottle.


The parachute
9. Use a large garbage bag to create the canopy. The bag has a long side and a short side. Cut off the closed short end off the bag. It should now be open at both ends.

9. Use a large garbage bag to create the canopy. The
bag has a long side and a short side. Cut off the
closed short end off the bag. It should now be open
at both ends.


10. Lay the bag down on a flat surface and smooth it
out. When folding the bag make sure the edges
are perfectly lined up.

 11. Fold the bag in half so that the short end is half as long and the long sides meet.

11. Fold the bag in half so that the short end is half as
long and the long sides meet.


12. Now fold the bag in half so that the long side is half as long and the open short sides meet.

12. Now fold the bag in half so that the long side is half
as long and the open short sides meet.



13. Take a corned from the closed end and fold the bag into a triangle.

13. Take a corned from the closed end and fold the bag
into a triangle.


14. Fold the hypotenuse (the long side of the triangle) so that it lines up with the right side of the triangle in the above drawing.

14. Fold the hypotenuse (the long side of
the triangle) so that it lines up with the
right side of the triangle in the above
drawing.


15. Examine the base of the triangle and measure the shortest length from the tip to the base. This will be a limiting factor for the chute size. The pointed end will end up being the middle of the canopy.

15. Examine the base of the triangle and measure the
shortest length from the tip to the base. This will be a
limiting factor for the chute size. The pointed end will
end up being the middle of the canopy.


ie: If you want the diameter of the chute to be 34 inches
then measure 17 inches from the center of the canopy
(the most pointed side of the parachute) along each side,
mark it and then cut it.

16. Draw a line across the bag

16. Draw a line across the bag


17. Cut the bag

17. Cut the bag


A good parachute has shroud lines that are at least as long as the diameter of the canopy.

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