Theta 18 Aerospace Speciality Products Page 4
Test fit the engine mount assembly into the body tube. If needed, sand the outside of centering rings
for a smooth, but snug, fit. You should be able to slide the engine mount into the tube in one smooth
motion. Remove the engine mount from the body tube.
Locate the wooden craft stick and make a mark on the craft stick 2" from one end. Put some glue on
the end of the stick and
spread a generous, even layer of glue about 2" up on the
inside
of the body
tube (see Figure F).
Thread Shock Cord Through
Top of Engine Mount
Shock Cord Hanging Out of the
Rear of the Engine Mount
2" Mark
Apply Glue
INSIDE
Tube Here
2" Inside Tube
Craft Stick
Figure E
Figure F
Next apply a thin layer of glue to the outside of the rear centering ring (the one further away from the
engine block, see Figure G). In one smooth motion insert the engine mount into the bottom of the
body tube (be sure to insert the end with the engine block first!
). The bottom of the lower centering
ring should be even with the bottom of the body tube (the red engine tube will extend out from the
bottom of the body tube), as shown in Figure H. Wipe away any excess glue that may have come out
near the rear centering ring and
allow to dry completely. After the mount is dry, thread the shock cord
back through the engine mount so that the cord is inside the body tube
.
Body Tube
Glue Inside of Tube
Apply Glue to
outside
of this Centering Ring
Body Tube
End of Centering Ring
Even with End of Body Tube
Engine Mount
Shock
Cord
Figure G
Figure H
⎕
4) Locate the set of fins. Carefully remove the fins from the laser cut sheets of wood. You may
need to separate them from the surrounding wood with your hobby knife.
Root
!
Edge
Leading Edge
Tip
!
Edge
Trailing Edge
Leading Edges
Trailing Edges
End
!
Views
!
of Fins
Fin
1/8"
!
Mark
Body
!
Tube
Figure I
Figure J
Figure K
