Apogee 00524 Manual - Página 2

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Fin Shape Science Rocket Assembly

1. Remove the parts for the fin alignment

fixture from the cardboard sheet. Dry as-

semble the parts as shown. Make sure the

tabs on the cross pieces protrude through

the side plates. Apply a bead of wood glue

over the tabs on both sides of the tool. Set

the piece aside to allow the glue to dry.

2. Fine sand the balsa wood laser-cut

sheets using 200 and then 400 grit sand-

paper before removing the fins. Carefully

remove all the pieces from the sheet by free-

ing the edges with a sharp hobby knife.

It is probably wise to leave the edges

square and don't round them with sandpa-

per. That way, all the edges of the fins are

identical, even though the rocket won't fly

as high. Remember, you're testing the fin

shape, not the edges.

There are four pre-cut shapes you can

test in this kit. The pattern sheet (page 8)

has 11 other shapes you can try if you want

to cut out some additional shapes yourself.

3. Test your own fins: It is recommended

you make three photocopies of the fin pat-

tern sheet. With scissors, cut out the pat-

terns you wish to test.

Arrange the patterns on the balsa sheet,

assuring that the fin grain direction on the

pattern matches the direction of the wood

grain on the balsa wood. This will give the

strongest fins that won't easily snap dur-

ing launch. Tip: You may have to flip one of

the patterns over to get three fins to fit on a

single sheet of balsa.

4. Once you have the orientation of the

pattern to the wood grain correct, affix the

patterns to the balsa sheet with rubber ce-

ment, spray adhesive, or a glue stick. Don't

use liquid glue, or it will be hard to remove

the paper after it has dried.

Cut out the pattern using a ruler and a

sharp hobby knife as shown.

5. Sealing the surface of the balsa

with sanding sealer makes the surface of

the wood consistent. It also improves the

rocket's appearance. Apply the sealer with

a paintbrush. When dry, sand it with 400 grit

sandpaper. Repeat the procedure until the

balsa grain is filled and the fins look and feel

smooth.

6. Test fit each of the fins into the slots on

the fin alignment fixture. If they are too tight,

you will need to sand down the thickness

slightly.

Page 2

Glue

(both sides)

Align wood grain

with the pattern