Hangar 9 P-51D Blue Nose 60 ARF - Manual (Page 10)

18 Hangar 9 P-51 Mustang 60 ARF Assembly Manual 19 Hangar 9 P-51 Mustang 60 ARF Assembly Manual
 Step 10
Pass the extension through the hole in the wing behind the
opening for the retract mechanism.
 Step 11
Position the retract mechanism into the wing. Use four
8-32 x 3/4-inch socket head screws and four #8 washers
to secure the retract mechanism in the wing. Tighten the
screws using a 9/64-inch hex wrench or ball driver. Make
sure to use threadlock on all four screws so they do not
vibrate loose in flight.
 Step 12
Use a T-pin to poke through the covering of the retract
servo cover so the holes can be located from the top-side of
the cover.
 Step 13
Position the retract servo cover over the retract servo. Slide
the cover back snug against the wing. Use a drill and 1/16-
inch (1.5mm) drill bit to drill the two holes for the cover
mounting screws. Use care not to drill through the top of the
wing when drilling these holes.
 Step 14
Apply 2–3 drops of thin CA into each hole to harden the
surrounding wood. This provides a harder surface for the
screws making them more secure when installed.
 Step 15
Secure the cover to the wing using two #2 x 3/8-inch
sheet metal screws. Tighten the screws using a #1 Phillips
screwdriver.
 Step 5
Check to make sure you are installing the servo on the
correct side of the retract mechanism. The servo will face to
the trailing edge when installed.
Note : The next steps will check the operation of the
retract mechanism. Do not secure the servo as poor
positioning of the linkage or servo could cause the
servo to bind causing stress on the radio battery or
even damage the servo gears.
 Step 6
With the retract mechanism and servo in the “up” position,
check the fit of the servo in the retract frame. The mounting
holes of the servo must align with the holes in the frame for
mounting the servo. It may be necessary to adjust the length
of the linkage to get the mounting holes to align.
 Step 7
Hold the servo in position against the retract frame. Check
the operation of the retract using the radio system. When the
retract mechanism is in the “down” position the mounting
holes should still be aligned. If not, the linkage may need
some more minor adjustments in length.
Important : Also make sure the retract mechanism is
locking in both the “up” and “down” positions. If not, it
may be necessary to prepare a new servo horn with the
hole in a slightly different position.
 Step 8
Once the retract is operating without binding and locking in
both the “up” and “down” positions, use four 2mm x 12mm
machine screws and four 2mm washers to secure the retract
to the retract frame. Use a 1.5mm hex wrench to tighten
these screws.
 Step 9
Secure a 6-inch (152mm) servo extension to the retract
servo using string, dental floss or a commercially available
fastener.