Theta 18 Aerospace Speciality Products Page 6
2 1/2" Mark on
Body Tube
Launch Lug
Fin
Fillet
Body
!
Tube
Figure M
Figure N
⎕
7) After the glue is completely dry, apply a small amount of glue to the joint between the root edge
of one of the fins and the body tube. Smooth the glue with your finger to form a small, smooth fillet
and remove any excess glue (see Figure N). Continue to add fillets to all the fins. Allow the model to
rest horizontally while the glue dries on each set of fins (you can download the “Rocket Caddy” from
our website to make a stand that will hold your model horizontally). The fillets will strengthen the fin
attachment. Apply fillets to the launch lug as well and allow to dry.
⎕
8) See Figure O for this step. Locate the balsa nose cone, the small dowel and the metal screw
eye. Test fit the shoulder of the nose cone into the top end of the upper body tube - sand the shoulder
if needed for a smooth fit.
The dowel has a pre-drilled hole in one end - put a drop of glue on the sharp end of the screw eye
and thread the screw eye into the hole in the dowel. Next put some glue into the hole in the base of
the nose cone and glue the dowel into the nose cone and allow to dry. Firmly tie the loose end of the
Kevlar® shock cord to the screw eye.
Nose Cone
Dowel
Screw Eye
Tape
Shock Cord
Tape
Figure O
Figure P
⎕
9) R
efer to Figure P as needed for this step.
Locate the plastic streamer material. Lay the shock
cord over the streamer about 3" from the screw eye. The cord should be about 1" from one end of the
streamer. Firmly tape the shock cord to the streamer. Next fold the short piece of the streamer back
over the shock cord and apply another piece of tape to tape the streamer to itself.
