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8. The inside edge of the small end of the
tailcone may need to be sanded to allow the
engine mount tube to slip through. To do this,
wrap a rough-grit sandpaper around a wooden
dowel or small rocket motor, and sand out the
inside edge of the hole until the engine mount
tube slips easily through it. Try to keep equal
wall thickness all the way around the edge of
the plastic.
If the tube is too loose in the plastic part, don’t
worry. This will be fixed at motor mount instal-
lation.
9. Mark a line on the outside of the motor
mount tube 2.25” (57mm) from one end. This
will be the
aft end
of the rocket. Make this line
about 1/8” (3mm) long as the picture shows.
Take a hobby knife and cut a 1/8” (3mm) long
slit in the engine tube along the line as shown
in the picture. You will insert one end of the
motor hook into this slit.
10. Make a mark 1” (25.4mm) from the aft
of the engine tube Find one of the large green
rings that fits over the 24mm diameter engine
mount tube. Put a thin layer of wood glue
around the engine tube behind the mark you
made. Take the green ring, slide it onto the
engine hook, and then onto the engine tube
until it it up against the mark. (Be sure that
the engine hook remains perpendicular to the
engine tube).
11. Glue the small green engine block ring
inside the front end of the engine mount tube
using wood glue. It should butt up against the
metal engine hook that protrudes inside the
tube.
12.
DO NOT USE ANY GLUE ON THIS
STEP!
Make a mark 1.0” (25.4mm) from the
front of the engine tube. Find the other large
green ring that fits over the 24mm diameter
engine mount tube. Cut a notch on the inside
of the ring with a hobby knife. Tie the yellow
Kevlar
®
shock cord around the front end of the
engine mount tube. Now slide the green ring
over the Kevlar and onto the tube (the cord
should nest in the notch). Remove one of the
large centering rings from the die-cut card
sheet. Again, slide this ring over the front end
of the engine mount tube.
1/2 inch (13mm)
Cut a notch for
the shock cord.
�
Engine Hook Size
“A” Length
Estes D-Engine
2-1/4 inch (57mm)
Estes E-Engine
3-1/4 inch (83mm)
The “E”-size engine hook is not included
in this kit. They can be ordered from www.
ApogeeRockets.com. Select P/N 24049
1 inch (25.4mm)
1 inch (25.4mm)
DO NOT GLUE YET!
Sheet B - P/N 31091
