Hangar 9 Christen Eagle II 90 ARF Assembly Manual page 25

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3. With the spinner backplate tight against the engine drive
washer, position the cowl so there is a 1/16-inch (1.5mm) gap
between the cowl and spinner backplate. Make sure the gap is
even and that the cowl is aligned with the backplate.

4. Use a pencil to mark the locations on the cowl
mounting blocks.

Using a small piece of masking tape
on the blocks before installing the cowl
will make it easier to see the marks.

It may be necessary to cut an opening in
the cowl to clear the head of the engine or valve
covers, depending on your choice of engines.
Hangar 9 Christen Eagle II 90 ARF

5. Remove the spinner backplate and cowl. Use a drill
and 5/32-inch (2mm) drill bit to drill the holes in the cowl
mounting blocks for the cowl mounting screws.

6. Use a #1 Phillips screwdriver to thread an M3 x 8 self-
tapping screw in each hole. Remove the screw, then apply 2–3
drops of thin CA in each hole to harden the surrounding wood.

The following steps are only necessary if your are
installing a glow engine in your aircraft. If you have
elected to install the EP option, skip to Step 13.

7. Use hobby scissors and a rotary tool with a sanding
drum to remove material from the bottom of the cowl.
The opening should be 4 / inches (105mm) in width and
1
8
be 3 / inches (90mm) forward of the rear edge of the
1
2
cowling to provide enough area for air to pass over the
engine for cooling.

8. Use a hobby knife with a #11 blade and a rotary tool
with a sanding drum to cut a 1/2-inch (13mm) wide opening
from the painted air inlet for air flow into the cowl.
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