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Motor Tube
Assembly
1.
Using a hobby knife, carefully remove any body tube mate-
rial that may still be attached to any pre-cut slots in the
body tube.
2.
Insert 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.
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 through a slot in the
body tube and snap the fin into place. Repeat this process
for the other three fins. Apply glue fillets at the body and
fin joints.
Rear Centering Ring
1.
Slide the rear centering ring over the back of the motor tube and push it against the back FIN-LOK™ ring. Apply a bead of cement
where the centering ring meets the body tube and the motor tube. Securely tie an end of the shock cord to the screw eye with a
square knot. Do not put cement on the knot of the shock cord. Screw the screw eye through the bulkhead disc and then into the
hole in the ejection baffle until tight. Do not glue the screw eye into the ejection baffle.
2.
Epoxy the Piston Cap inside the Piston Sleeve recessed 3/8" from one end.(Use the black spacer tube as a support for this
operation.) When dry, apply epoxy fillets to both sides of the Cap/Sleeve joints. Do not allow any epoxy to drip on the outside
diameter of the Piston Assembly which could interfere with it's intended operational movement.
BODY AND FIN ASSEMBLY
Fin
FIN-LOK™ Tab
Fin Slot
CENTERING RING / DISC INSTALLATION
(NOTE: Each fin should be snug against the body tube.)
4.
Through the back end of the body tube, apply cement where
the fin tabs meet the motor tube, fin locks, and body tube.
Through the front end of the body tube, carefully apply
cement where the front centering ring meets the inside sur-
face of the body tube. This must be an airtight seal.
5.
Lightly 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 facing 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.
2.5" Bulkhead Disc
Motor Tube Assembly
PISTON ASSEMBLY
4
Body Tube
Fin Root
Launch Lug
Launch
Lug Slot
Screw Eye
Piston Cap Recessed 3/8"
From End of Piston Sleeve
19924 SUMO KIT REV: 8/04
Shock Cord
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