Apogee Skill Level 4 Handbuch - Seite 5

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15. Optional: Apply wood filler to the spiral

grooves in the tubes, at the joint between the

tubes, and on the ends of the exposed centering

rings. Allow the filler to dry and then sand the sur-

face smooth. Filling at this point is much simpler

than after assembly. To ensure solid construction

however, sand so that only a minimal amount of

filler remains and that it is entirely dry before glu-

ing other parts to the surface of the tube.

Main Fins

16. Cut the main fins out of the 3/32" balsa wood

sheet using a sharp hobby knife, and lightly sand

the edges if necessary to remove any remnants of

tabs.

17. Sand the fins smooth using a sanding block

and fine grit sandpaper. If a more scale appear-

ance is desired, the following optional steps may

be followed to achieve the diamond shaped airfoil

of the Black Brant VC fins.

Steps 18 through 25 are optional. They are provided to achieve a more scale look, but not required for the

Black Brant VC to fly. These optional steps use more advanced finishing techniques. Proceed to step 26 if

you wish to continue the build without completing the optional steps.

18. Mark the centerline of the forward and aft edg-

es of the fins by using the cardstock sheet and a

sharp pencil. Place the fin and the cardstock sheet

flat on a surface and draw along the fin, using the

cardstock as a spacer. As this will actually mark

slightly above the centerline, mark the fin once,

then flip it over and mark it again to get a better

estimate of the centerline. Do this for the forward

and aft edges of all four fins.

19. Apply masking tape to each of the fins such

that the edge of the tape marks a line between a

point 1/8" (3mm) behind the step at the root of the

fin, and 5/8" (16mm) from the forward edge at the

tip of the fin. Apply this tape to all of the fins in the

same way. The fin sanding guide in the beginning

of this instruction booklet can be used to check

that the areas are marked correctly both here and

in the following steps.

Step 15

Step 16

Step 17

Step 18

Mark Aft Edge

Step 19

5/8" (16mm)

Mark

Forward Edge

1/8" (3mm)

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