Great Planes Super Sportster 90/120 Kit - GPMA0214 User Manual

Page 38

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D 3. To hide the canopy glue joint, you can use

1/4" wide striping tape as a border around the

canopy

WING SEATING TAPE

1 Apply 1/4" or 3/8" wide foam wing seating

tape to the wing saddle area to seal the wing/
fuse joints.

2. Also apply a couple pieces of the foam tape
to the 1/4" ply wing hold-down plate, which
helps to distribute the load when the nylon
bolts are tightened.

NOTE An alternate method of sealing the wing/fuse

joint is to use "silicone bathtub sealer" This is an

excellent method, used by many experts because it
results in a permanent and nearly perfect wing sad-
dle joint Briefly, the technique is as follows 1 Cover
the top of the wing center section with plastic kitchen
wrap Pull out all wrinkles and tape it to the wing.
2 Squeeze out a bead of silicone sealer onto the wing
saddle area of the fuselage 3 Lay the wing in the
saddle and push down gently The excess silicone
sealer will squeeze out 4 Allow to dry without dis-
turbing for 24 hours 5 Remove the tape, then re-
move the wing from the saddle (leaving the plastic
wrap in place) 6 Gently pull the plastic wrap away
from the sealer 7 Using a new single-edge razor
blade, trim the sealer flush with the fuse sides, along
the inside and outside edges

RE-INSTALL ENGINE & RADIO

Re-install the engine, propeller, battery, re-

ceiver, servos, control horns, pushrods, main LG,
nose gear and wheels Attach the wing to the fusel-
age.

BALANCE YOUR MODEL

NOTE: This section is VERY important and
must not be omitted! A model that is not properly
balanced will be unstable and possibly unflyable.

D 1. Accurately mark the balance point on the

bottom of the wing The balance point is shown

on the plan (CG), and is located approximately
3-7/8 inches to 4 inches back from the leading
edge This is the balance point at which your
model should balance for your first flights.
Later, you may wish to shift the balance up to

1/2" forward or back to change the flying

characteristics Moving the balance forward re-
sults in a model that is more resistant to stalls
and spins but also may act sluggish and require
more speed for takeoff and landing Moving
the balance aft makes the model more agile
with a lighter and snappier "feel" In any case,
do not balance your model outside the rec-
ommended range.

D 2 With the wing attached to the fuselage, all

parts of the model installed (ready to fly), and
an empty fuel tank, block up the tail as neces-
sary to level the fuselage (If you have built a

tricycle, the fuse should already be sitting

level).

D 3. Lift the model at the balance point. If the

tail drops when you lift, the model is "tail
heavy" and you must add weight to the nose
to balance If the nose drops, it is "nose heavy"
and you must add weight to the tail to balance

FINAL HOOKUPS AND CHECKS

D 1. Make sure the control surfaces move in the

proper direction as illustrated in the following
sketches

F O U R - C H A N N E L SETUP

CONTROL SURFACE

MOVEMENTS

ELEVATOR MOVES UP

RIGHT AILERON MOVES UP
LEFT AILERON MOVES DOWN

RUDDER MOVES RIGHT

NOSE WHEEL TURNS RIGHT

CARBURETOR WIDE OPEN

D 2. Adjust your pushrod hookups as necessary

to provide the following control surface move-
ments

Elevator. 5/8" up, and 5/8" down

Rudder 1-1/4" left, and 1-1/4" right

Ailerons. 3/8" up, and 3/8" down

NOTE: These control surface "throws" are approxi-
mate and provide a good starting point for the first
flights with your Super Sportster 90/120 You may
wish to adjust the throws slightly to provide the
smoothness or quickness that you prefer

D 3. Check for wing twist as follows:

NOTE Even if you have built your wing on a per-
fectly flat surface and used utmost care, it is possible

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