Apogee Midge Посібник користувача - Сторінка 4

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12. 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.

For higher flights, round the edges of the

fins with sandpaper – or better yet – sand an

airfoil shape into them. Test fit the fins into

the slots on the fin alignment fixture. If they

are too tight, you will need to sand down the

thickness slightly.

13. Sealing the surface of the balsa with

sanding sealer reduces the skin friction drag

on the rocket, allowing it to fly higher. It also

improves the rocket's appearance. Apply the

sealer with a paintbrush. When dry, sand it

with 400 grit sandpaper. Repeat the proce-

dure until the balsa grain is filled and the fins

look and feel smooth.

14. Slide the fin alignment fixture onto the

long body tube over the end that is etched

with the fin lines. Test fit the smaller set of

fins into the fixture. Position the trailing edge

of the fins on the tick-marks that are etched

onto the fin lines. When you know how the

fins are attached, you can remove them from

the fin alignment fixture and apply wood glue

to the root edge and then put them back into

the fin alignment fixture. Allow the glue time

to dry before removing the fin fixture.

15. Repeat the process of attaching the

fins, but this time use the larger fins and at-

tach them to the short booster stage tube.

OPTIONAL: For competition flights, it is

recommended that you launch the rocket

from a piston launcher or from a launch

tower. But if you do not have one, you'll

need to use a standard launch rod. In that

case, install the launch lug as follows.

16. Glue the balsa wood standoff to the

front end of the body tube in the position

marked on the tube. When the glue is dry,

glue the launch lug to the stand-off using

wood glue. Make sure the lug is parallel to

the length of body tube.

17. Add wood glue fillets to the fins and

the launch lug (if added). Lay the rocket

horizontally to let the glue dry.

Page 4

Smaller

fins

Sustainer (upper stage)

Fin location

line

Larger fins used

in booster stage

Fin location

line