| MATERIALS: The following materials that will be used in this project can be found in the student bin: | |
| - 2 3/4" BT-20 engine tube - Engine guard clip - 6" elastic shock cord - 9" BT-50 body tube - screw eye |
- parachute material - nose cone - Two adapter rings, 1/8" wide - Three balsa tail fins - 1" straw launch lug |
NOTE: You will need to supply your own notebook paper for this project. The sandpaper will be supplied by your instructor.
| The following material and equipment will be supplied in the module bin at the given work station: | |
| - 12" ruler - X-acto knife - Pair scissors - Cutting mat - Non-toxic school glue |
- Clear tape - Spool thread - Fin marking guide #1 - Fin marking guide #2 - Fin holder (in student bin) |
DIRECTIONS:
| 1. Place the large body tube onto the round Fin marking guide #1.
Make four marks around the bottom of the body tube that match up with the four
marks on the round fin marking guide. Remove the body tube from the marking
guide when finished.
|
| 2. Use Fin marking guide #2 to draw lines along the side of the body
tube. Line up the marks you made in step 1 with the "BT-50" marking guide.
Draw each line about 3" long.
|
| 3. Place the body tube onto the fin holder. NOTE: Make sure that three
of the four lines you have drawn will line up with the fin grooves on the fin
holder.
|
| 4. Apply glue to the edge of a fin. This edge will attach to the body
tube. Place this edge against the body tube so that the fin is resting in one
of the grooves in the fin holder. Do the same thing with the other fins.
NOTE: Do NOT glue the fin to the fin holder! | |
|
|
|
| 5. Find the piece of straw that has the ends cut at an angle. Glue the
long side of this straw to the body tube. Locate it between two tail fins,
along the fourth line drawn in step #2.
 |
 6. Put a notch in the small tube 2 1/2" from one end. |
 Put glue on one
half of the engine guard, and place that end into the notch in the tube. Cut a
strip of paper, 3/4" x 8 1/2". Wrap and glue this paper around the tube and
over the engine guard just below the notch. This will hold the engine guard in
place. |
| 7. Apply glue to the inside of both adapter rings, then slide them both
onto the engine holder, one from each end. Apply more glue around the edges of
each ring to help reinforce it. NOTE: One of the rings will go over the engine
clip.
|
8. Cut a piece of paper that is about 1" x 3". Smear glue on one side of
this paper. Place one end of the shock cord lengthwise in the middle of the
paper. Fold the paper in thirds over the shock cord (This means that the cord
will be folded up inside the paper).
|
9. Apply glue to one surface of this paper, and attach to the inside top
of the body tube. Make sure the paper is at least 1" inside the body tube, far
enough in so that it will not interfere with the fit of the nose cone.  |
| 10. Loop the other end of the shock cord through an eye screw, and tie it in place.
 |
| 11. Cut 3 strings to a length of 2 feet each. Loop the string over and
back under the tape, so that the string goes under the sticky side of the tape
twice. Attach the tape to the edge of the parachute material so that the
string comes out from under the tape at the edge of the parachute.
Tape each
end of each string to the given parachute material. (Each string has two ends,
so you should have six ends taped to the parachute.) Make sure all of the
taped ends of string are evenly spaced around the outer edge of the parachute. |
| 12. Adjust the strings to form three loops under the parachute. Take
care that the loops are centered on the string, so that the parachute will
work properly, and not allow the air to "slide" out at an angle. Ask your
instructor for assistance if needed. Tie a knot in the loops, so that they are tied together.
Slip these loops onto the screw eye. Attach the screw eye to the nose cone.
|
| 13. Cut the ring over the engine guard so that the guard can bend up
easily.
|
| 14. Apply glue to all of the edges of the adapter rings on the engine
holder. Make sure the glue fills the space inside the edge of the rings. Smear
glue on the outer surface of the rings. Slide the entire engine holder into
the bottom of the body tube.
NOTE: The guard should stick out from the
bottom of the body tube, and should be easily reached. |
| 15. Allow all glue joints to dry.
|
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