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o1) It is critical that your airplane be bal-
anced correctly. Improper balance will cause
your plane to lose control and crash. The
center of gravity is located 4” back from
the leading edge of the top wing, at the
center section. This location is recom-
mended for initial test flying and trimming.
There is a 3/8” margin forward and aft, but
it is not recommended that the center of grav-
ity be located any further back than 4-3/8”.
Balance the Ultimate right side up with the
fuel tank empty.
o 2) Mount the wings to the fuselage.
Using a couple of pieces of masking tape,
place them on the bottom side of the top
wing 4” back from the leading edge, at the
center section.
o 3) Place your fingers on the masking tape
and carefully lift the plane.
o 4) If the nose of the plane falls, the plane
is nose heavy. To correct this first move the
battery pack further back in the fuselage. If
this does not correct it, stick small amounts
of weight on the fuselage under the horizon-
tal stabilizer. If the tail of the plane falls, the
plane is tail heavy. To correct this, move the
battery and receiver forward or stick weight
onto the firewall or inside the front section of
the cowl. When balanced correctly, the air-
plane should sit level or slightly nose down
when you lift it up with your fingers.
Once you have flown and trimmed the
Ultimate, the balance point can be moved
forward or aft 3/8” to change the flight perfor-
mance. Moving the balance point back will
cause the Ultimate to be more responsive, but
less stable. Moving the balance point forward
will cause the Ultimate to be more stable, but
less responsive. Do not fly the Ultimate be-
yond the recommended balance range or an
uncontrollable crash could result!
LATERAL BALANCE
After you have balanced your Ultimate
on the C.G. you must laterally balance
it. Doing this will help the airplane track bet-
ter in vertical maneuvers and loops.
o 1) Turn the airplane upside down. With
the wings level carefully lift the airplane by
the engine crankshaft and the tail wheel
bracket. This may require two people to make
it easier.
o 2) If one side of the wing falls, that side
is heavier than the opposite. Add small
amounts of lead weight to the bottom side of
the lower wing. Follow this procedure until
the wings stay level when you lift the airplane.
o 1) We highly recommend setting up the
Ultimate using the control throws listed be-
low. We have listed control throws for both
initial test flying/sport flying and aerobatic
flying.
o 2) Turn on the radio system and with the
trim tabs on the transmitter in neutral, center
the control surfaces by making adjustments
to the clevises. The servo arms should be cen-
tered also.
o 3) When the elevator, rudder and aileron
control surfaces are centered, use a ruler and
check the amount of the control throw in each
surface. The control throws should be mea-
sured at the widest point of each surface!
Ailerons: 3/16” up 3/16” down
Elevator: 7/16” up 7/16” down
Rudder: 1” right 1” left
AEROBATIC FLYING
Ailerons: 5/16” up 5/16” down
Elevator: 3/4” up 3/4” down
Rudder: 1-1/2” right 1-1/2” left
Do not use the aerobatic settings for ini-
tial test flying or sport flying.
INITIAL FLYING/SPORT FLYING
BALANCE
CONTROL THROWS
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