Great Planes Ultra Sport 40 ARF Red - GPMA1005 - Manual (Page 15)

Cut-out the Wing Dowel Hole Prepare to Install the Stabilizer
6. Trim away the plastic that covers the wing dowel hole
in the front of the radio compartment.
Align Vertical Stabilizer Trailing Edge
with Aft Edge of Fuselage
Aligned
Adjust Horizontal Stabilizer
Forward or Aft
Note: When mounting the horizontal stabilizer do not slide
the stabilizer fully forward in the saddle. Instead, position
the stabilizer in the location where the trailing edge of the
vertical stabilizer will line up with the aft edge of the
fuselage, thus providing a straight hinge line for the rudder.
Trial fit the vertical stabilizer before mounting the horizontal
stabilizer to make sure you are locating the horizontal
stabilizer correctly.
Horizontal Stabilizer
Install the Stabilizer Platform
1. Locate the 1/8" plywood stabilizer platform and trial fit 2. Accurately measure the horizontal stabilizer and
the platform into the fuselage tail. Lightly sand the
platform if necessary to obtain a proper fit. Use 6-minute
epoxy to glue the platform into place. Remove any excess
epoxy that remains on the top of the platform, as well as
on the outside of the fuselage, using rubbing alcohol and a
paper towel. After the epoxy has cured, attach the wing,
then place the horizontal stabilizer on the platform and
check to see if the horizontal stabilizer is level with the
wing by viewing directly from the rear. If it is not, lightly
sand the stabilizer platform until a smooth, even and level
surface is obtained.
draw a centerline on the stabilizer. Determine if the
fuselage panel line in the center of the fuselage is
accurate. If not, measure and mark a centerline on the
fuselage. Attach a piece of string with a pin to the
fuselage centerline as shown. Stretch the string to the
corner of the horizontal stabilizer. The distance from the
pin to the horizontal stabilizer must be the same on both
sides. This method will adjust the horizontal stabilizer
perpendicular to the centerline of the aircraft. The
horizontal stabilizer must be centered accurately with the
fuselage centerline for this technique to work correctly.
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