Top Flite TOPA0101 - Manual (Page 17)

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18. Make a skin to cover the area aft of the spar
from R-5 to T-1. Wet the skin and place it over the
structure. Trim it so it fits well at T-1 and at the
spar. Glue the wet skin to the structure.
Photo for steps 19-20
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19. Make a skin for the section forward of the
spar from R-5 to R-3. Glue this piece on dry.
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20. Skin the top of the wing between the two R-5’s.
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21. Add some CA to any questionable center
section top wing skin joints from the bottom side of
the wing.
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22. If you are using flaps, install the servos now.
They are mounted on 3/16" x 3/8" plywood rails
between ribs R-4 and R-5. Notice that one servo is
mounted inboard in the bay and one is mounted
outboard. This allows both pushrods to exit at the
center of the bay. Route the servo leads to the
center as shown. (A Y-harness is used to connect
the two flap servos together. Plug the Y-harness
into the receiver and use it as an extension.)
NOTE: The ribs were changed slightly after the
photos were taken to make it easier to mount the
servo rails.
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23. Make the flap pushrods from two 12"
threaded end wires. Use nylon clevises at one end
of the wires and make Z-bends at the other. When
the servos are
centered the clevis pins should line
up with the seam between the two 3/16" TE
laminations.
NOTE 1: If you are using fixed gear, the standard
procedure is to securely screw the fixed gear into
place before proceeding to sheet around the wire
strut. An alternative is to proceed as you would
with the retracts. Sheet the bottom of the wing with
no gear installed and cut out an opening for
installing the fixed/retract gear after sheeting is
completed. A balsa block (not supplied) could be
glued to each fixed gear plate (with holes drilled to
access mounting bolts) and faired into the bottom
of the wing. This technique allows you to remove
the fixed gear for servicing.
NOTE 2: All of the bottom wing sheeting is cut from
the remaining 1/16" x 3" x 24" balsa sheeting. Study
the photos in this section before proceeding. You may
find it faster and easier to do both left and right wings
at the same time to avoid having to determine sheet
shapes twice. Indicated skin sizes are approximate.
NOTE 3: Parts of the center section will be
covered by the belly-pan. Do not fill small misfits in
this area until after the belly-pan is installed.
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24. Cut a 1-1/2" x 10" piece of 1/16" wing skin.
Glue it behind the main spar, starting at the aft half
of the main spar.
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25. Next, glue a 1-1/2" x 7" piece forward from
the center of the main spar. This sheet covers from
R-4B outward to T-1.
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