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of FIN-LOK™ tab
Cut off and Sand "nub"
on each side of fin.
Sand here to
remove rough
edges.
FIN DETAIL
Use a pair of pliers to snap off the lower half of the FIN-
4.
LOK™ tab from each of the four (4) fins as shown.
Discard the pieces that were broken off. Sand the edge
of the tabs to remove any rough edges from where the
lower half of the fin tabs were removed. Cut and sand the
nub on each side of the fin until smooth.
5. Test the proper positioning and alignment of the FIN-
LOK™ rings by snapping the fins into the fin locks. If any
fin does not snap into place, check to see that each FIN-
LOK™ ring is the correct distance from the back end of the
motor tube and that the fin has no plastic flashing left from
production that may be preventing a proper fit. Remove
any plastic flashing with a hobby knife or sandpaper. After
making any adjustments, carefully remove the fins and
the back centering ring. Check that the front centering
ring is still positioned next to and touching the front FIN-
LOK™ ring.
DO NOT CEMENT COOLING
MESH INTO MOTOR TUBE
1. Make four 1/4" (6mm) long cuts, 90 degrees apart, in the
front end of the motor tube.
2. Stretch out the cooling mesh to about 6" (15cm) in length.
Insert the cooling mesh into the front end of the motor
tube. (NOTE: Do not cement the mesh into the motor
tube.)
3. Apply a thin film of cement to the front 2/3rd's of the
shoulder of the ejection gas baffle and insert the baffle
shoulder into the front end of the motor tube.
FIN-LOK™ ASSEMBLY (CONT.)
Lower Half
(discard)
Fin
Locks
LABYRINTH™ ASSEMBLY
Motor
1/4"/6mm
Tube
Cuts
Front
Centering
Ring
Cement
Beads
6. Apply a bead of cement where the front centering ring
meets the motor tube. Without getting cement into any of
the finlocks, apply cement only to the areas BETWEEN
the finlocks where the front FIN-LOK™ ring meets the
front centering ring and the motor tube.
7. Without getting cement into any of the fin locks, apply
cement only to the areas BETWEEN the fin locks where
only the front edge of the back FIN-LOK™ring meets the
motor tube. DO NOT apply cement to the back edge of the
back FIN-LOK™ ring. (NOTE: The unique AEROTECH
FIN-LOK™ fin mounting system carries and distributes
aerodynamic and thrust loads throughout an integrated
rocket structure in a manner found in large aerospace
vehicles. Loads are primarily borne by structural mem-
bers and not cement.)
8. Apply a bead of cement around the motor hook forward of
the front centering ring.
Baffle
Flange
Permanent
Cooling Mesh
Gas Baffle
(Stretch Out - 6")
Shoulder
4. Apply beads of cement where the baffle meets the
motor tube and into each of the cuts in the motor tube.
5. Apply cement to the front surface of the baffle flange and
place an AERO-FIBRE™ centering ring over the front end
of the baffle so it rests upon the baffle flange.
6. Screw the screw eye all the way into the hole at the front
end of the baffle. Securely tie an end of the shock cord to
the screw eye with a square knot. (CAUTION: Do not put
cement on the knot of the shock cord. Cement will weaken
the shock cord.)
3
A/D-3
DO NOT ALLOW CEMENT
TO GET IN THE FIN LOCKS
Screw
Eye
Centering
Ejection
Ring
Front
End
Shock
Cord
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