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FIN DETAIL
1. Using a hobby knife, carefully remove any body tube
material that may still be attached to any pre-cut slots in
the body tube.
2. Insert the loose end of the shock cord and then the motor
tube assembly into the back of the rocket body tube as
shown. Position the motor tube assembly so that the fin
locks are located under and visible through the body
tube's pre-cut fin slots.
3. Use a pair of pliers to snap off the lower half of the FIN-
LOK™ tab from each of the four (4) fins as shown. Discard
the pieces that were broken off. Sand the edge of the fin
tabs to remove any jagged edges from where the lower
half of the fin tabs were removed.
4. Apply cement along the full length of the fin root of a fin
(area of the fin that makes contact with the outside surface
of the body tube). Carefully insert the fin tab through a slot
in the body tube and push the fin in until it makes contact
with the FIN-LOK™ ring. Snap the forward part of the fin
tab into the forward FIN-LOK™ ring. Then snap the back
Mark
Coupler
Tube
Shock
Cord
1. Screw the other screw eye all the way in to the hole in the
bulkhead (1/16"/1.6 mm thick). Apply a bead of cement
where the screw eye meets the bulkhead.
2. Pass the free end of the shock cord through the coulper
tube (4"/ 10 cm long) and securely tie it to the screw eye
attached to the bulkhead with a square knot. (CAUTION:
Do not put cement on the knot of the shock cord. Cement
will weaken the shock cord.)
3. Cement the bulkhead to the end of the coupler tube.
4. Make a mark 2" (51 mm) from an end of the coupler tube.
LOWER BODY AND FIN ASSEMBLY
Lower half of
FIN-LOK™ tab
(discard)
FIN-LOK™
Tab
Sand here to
remove jagged
edges
Motor
Tube
Assembly
UPPER BODY ASSEMBLY
Screw
Eye
Fin
Fin
Slot
part of the fin tab into the back FIN-LOK™ ring. Gently
wiggle the fin from side to side to make sure the body tube
"pops" back into position against the fin root surface.
Repeat this process for the other three fins.
5. Through the back end of the body tube, apply cement
where the fin tabs meet the motor tube, fin locks, front
centering ring and body tube. Through the front end of the
body tube, apply cement where the baffle flange meets
the inside surface of the body tube
6. Lghtly sand the surface of the body tube around the
launch lug slots. Apply cement to the base of a launch lug.
With the sloping portion of the launch lug toward the front
of the body tube, insert the tab on the bottom of the lug into
one of the pre-cut launch lug slots in the body tube.
Repeat this process for the other launch lug.
7. Paint the rocket body and three fins flat white. Paint the
fourth fin flat black. (CAUTION: Make sure the paint is
compatible with high impact polystyrene plastic.)
Bulkhead
Lightly sand the surface of the tube between the mark and
the bulkhead.
5. Paint the upper body tube flat white (NOTE: See "Preci-
sion Scale Notes", on page 5). Use a small dowel to apply
a bead of cement around the inside of the upper body tube
about 1" (25 mm) from the end of the tube. Then slide the
coupler tube into the upper body tube up to the mark on
the coupler tube.
6. Paint the nose cone red and cement the nose cone into
the forward end of the upper body tube
4
Launch
Lug
Launch
Lug
Fin
Slot
Root
Nose
Cone
Upper
Body
Tube
Shock
Cord
Body
Tube
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