Top Flite TOPA0305 Part 1 User Manual

Page 36

Enlarge the holes i n the hatch covers

only with a 3/32" drill bit.

Countersink the holes for

the

x 3 / 8 flat head screws with a countersink or

other pointed tool. Test fit the hatch covers to the
rails with the screws. If necessary, remove the
hatch covers and sand the sides of the hatch
covers

they align with the edges of the hatch.

Note: Though the hatch covers are 1 / 1 6 thick and

the wing sheeting is 3/32" thick, by the time you
sand the wing sheeting smooth it will be the same

height as the hatch covers.

not, you can raise the

hatch covers by placing thin shims made from
1 / 6 4 plywood or thin cardstock on top of the rails.

4. Use 30-minute epoxy to glue the 5/16"

3/4"

x 7/8" servo mount blocks to the servo hatch

covers as shown on the plan.

Note: You can increase the strength of this joint by

drilling a few shallow 1/16" holes into the servo

mount blocks. This will create epoxy pins that
extend into the blocks.

5. Mount your servos to the blocks with

' k , , u

screws included with your servos. Test fit the servo

hatches in the wing and screw them down with the
hatch cover screws.

6. Return to the first step and mount the flap and

aileron servos in the other wing panel.

7. Glue leftover 1/16" balsa sheeting to the

inside of the bottom sheeting around the wheel

well cutout with the grain direction opposite that of
the wing sheeting. This will reinforce the sheeting

around the wheel well cutout.

8. Brush another coat of fuelproof paint inside

the wheel wells while they are still easy to reach
with a paint brush.

JOIN THE WING PANELS

Remove the flaps. Test fit both outer panels to

the center section. Make small adjustments if

necessary to minimize any gaps you see.

Test fit

your clamps to make sure you have enough of
them and to make sure you know where you are
going to place the clamps when you actually glue
the wing together.

3-9/16"

BALSA

STICKS

2. Optional: The dihedral braces and the

preset

angle of the root ribs on the outer panels will
determine the dihedral in the wing. But

you wish

to check the dihedral before you permanently glue
the wings together, clamp the wing together, raise

the center section off your workbench with balsa
sticks of equal size

(so

the wing is not resting on

the clamps) and measure the height of both wing
tips. The height of

both tips (measured under the

bottom of the spar at tip rib W14) should be 3-9/16"
(not including the balsa sticks). If the measured
dihedral of both wing tips is within a range of 3-3/8"
to 3-3/4", the dihedral is okay.

3. Mix a batch of 45 or 30-minute epoxy

join

the wing panels to the center section. Apply epoxy
to all the mating surfaces of the end ribs, spars and
dihedral braces. If you have installed the wires for
the wing tip lighting, pull the wires through the root

ribs

you can route them into the center section.

Join the outer panels to the center section and
position your clamps. Wipe away excess epoxy
with a paper towel before it cures and do not
disturb the wing until the epoxy cures.

MAKE THE FLAP AND AILERON

PUSHRODS

1 . Cut a 1/8" deep notch in the aileron for the

die-cut 1/8" plywood aileron

horn mounting

plate

where shown on the plan. Glue the horn mounting

plate to the aileron and sand it to match the
leading edge.