CONSTRUCTION
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1. Assemble two (2) standard 18mm motor mounts and set
aside to dry. See separate sheet for instructions.

2. Mark BT-50-3 (3" long) booster body for three fins,
120 degrees apart.

3. Mark BT-50L sustainer body for three fins, 120 degrees
apart. Draw a line halfway between two fins for the
launch lug, and place a mark on this line 4" up from the
bottom of the tube for lug placement.

4. Glue the JT-50C into the top of the BT-50-3 booster
body to a depth of 3/8" (5/8" of the coupler should still
show).

5. Glue the NB-50-1 into the bottom of the BT-50S payload
body to a depth of 3/8" (5/8" of the bulkhead should still
show).

6. Cut and sand the fins from the BFS-30 (3/32" thick balsa)
sheet stock. Lightly sand the leading and trailing edges, and
the tips, round. Do not round the root edges.

7. Attach the fins to the body tubes using the double-glue
technique in Stine's Handbook. Use plenty of clamps to ensure
allignment.

8. Glue one of the motor mounts into the BT-50L sustainer, and
press inward until the bottom of the motor tube is flush with
the bottom of the body tube. The engine hook remains proud of
the body.

9. Glue the other motor mount into the BT-50-3 booster, and press
inward until the bottom of the motor tube is 1/16" below the
bottom of the booster tube.

10. Thread the screw eye into the bottom of the NB-50-1, then
unthread the eye and force glue into the hole. Rethread the eye
into the hole and let dry.

11. Assemble a standard 14" diameter parachute and attach to the
screw eye with a swivel.

12. Attach the shock chord to the inside of the BT-50L with a
traditional folded-paper technique, at least 1" or more from
the top of the tube, to allow for the nose cone shoulder to fit
properly.


Copyright © 2003 by Craig McGraw.
All Rights Reserved.