Hangar 9 Extra 300 ARF Assembly Manual page 26


4. Remove the balsa ramp.

5. Iron down the edges and make sure to remove any
excess covering that may catch air in-flight and lift up.

6. Remove the covering from the aft opening. The picture
below shows the two places where covering needs to be
removed for tune pipe installation.
26

7. Trial fit the mount before gluing to the fuselage. If it
needs adjustment use 100-grit sandpaper and adjust for a
snug fit.
Note: Make sure that the sandpaper is on a flat surface
and carefully remove a small amount until fit is perfect.
Do not over sand the mount.

8. Once satisfied with the fit of the mount in the fuselage,
mix a small amount of 30-minute epoxy with mixing cup and
sticks and apply to the mount using acid brush.

9. Apply some epoxy to the fuselage where the mount
interlocks and the walls where the mount touches.

10. Carefully glue the mount in place and wait until it is
cured before installing the tuned pipes.
The picture below shows the mount installed.
35% Extra 300 ARF Assembly Manual