Great Planes F4 Phantom - GPMA0440 - Manual (Page 9)

2. Cut the fin tip from the remaining 3/8" x 1-3/8" balsa
stick. Glue the fin tip to the top of the fin.
C. Use playing cards or business cards to adjust the
height of the pen until you can mark the centerline.
3. Sand a radius on the corner of the fin tip as shown on
the plan. Sand both sides of the fin until they are flat and
even. Be careful not to sand any area of the fin too thin.
1. Glue the shaped 3/8" balsa rudder LE to the tapered
3/8" balsa TE. Trim and sand the TE to the same length as
the LE. Draw a centerline on the LE of the shaped 3/8"
balsa rudder (see the expert tip below).
2. Set the rudder on its LE and use the parallel line
method to draw a line 5/32" from the LE, on the sides of
the rudder.
HOW TO MARK PARALLEL LINES
the rudder cross-section.
3. Sand a taper on both sides of the rudder as shown on
It's important that the centerlines and "bevel to" lines are
parallel to the edge of the part.
4. Tape the rudder in position on the TE of the fin. Sand
a taper on the fin tip to match the taper on the rudder.
A. Position the rudder and a ballpoint pen on a flat
surface. Mark a "test line" on the LE of the rudder.
B. Flip the rudder over and mark another line in the
same location as the first. If you see only one line, then it
is on center. Proceed and mark the centerline on the
LE. If you see two lines, you will have to adjust the
height of the pen until you can mark the centerline.
plan and lightly mark the hinge locations on the TE of the
stab and LE of the elevator.
and elevator's LE using the parallel lines method described
in the previous expert tip.
1. Place the stab and elevator over their locations on the
2. Mark the centerline of the hinges on the stab's TE
9