Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 47)

TRIM FEATURE MANEUVERS OBSERVATIONS CORRECTIONS
CONTROL
CENTERING
CONTROL
THROWS
ENGINE
THRUST
ANGLE'
CENTER OF
GRAVITY
LONGITUDINAL
BALANCE
Fly general circles and
random maneuvers.
Random maneuvers.
From straight flight,
chop throttle quickly.
From level flight roll to
45-degree bank and
neutralize controls.
Try for hands off straight and
level flight.
A. Too sensitive, jerky
controls.
B. Not sufficient control.
A. Aircraft continues level
path for short distance.
B. Plane pitches nose up.
C. Plane pitches nose down.
A. Continues in bank for
moderate distance.
B. Nose pitches up.
C. Nose drops.
Readjust linkages so that
Tx trims are centered.
If A,
redu
IfB,
If A,
IfB,
"C,
If A,
IfB.
IfC,
change linkages to
ce throws.
increase throws.
trim is okay.
decrease downthrust.
increase downthrust.
trim is good.
add nose weight.
remove nose weight.
SPLIT ELEVATORS
(Also Yaw and
C.G.) Into wind, pull open
loops, using only elevator.
Repeat tests doing outside
loops to inverted entry. A. Wings are level throughout.
B. Plane tends toward outside
when right side up, and to
inside when inverted.
C. Plane goes in on regular
loops, and out on inverted.
D. Plane goes out on both
types of loops.
E. Plane goes in on both
types of loops.
If A, trim is fine.
If B, add weight to right
wing, or add right rudder.
If C, add weight to left
wing, or add left rudder.
If D, raise right half of
elevator (or lower left).
If E, raise left half of
elevator (or lower right).
YAW2 Into wind, do open loops,
using only elevator.
Repeat tests doing
outside loops from
inverted entry.
A. Wings are level throughout.
B. Yaws to right in both
inside and outside loops.
C. Yaws to left in both
inside and outside loops.
D. Yaws right on insides, and
left on outside loops.
E. Yaws left on insides, and
right on outside loops.
If A, trim is correct.
If B, add left rudder trim.
If C, add right rudder trim.
If D, add left aileron trim.
If E, add right aileron trim.
LATERAL
BALANCE
climbs into Hammerheads.
Do same from inverted
C. Falls off to right in both
AILERON
RIGGING
C. Nose tends to go to
WING
INCIDENCE
B. Model veers in nose
Into wind, do tight inside
loops, or make straight up
entry.
With wings level, pull
to vertical climb and
neutralize controls.
Knife edge flight.
A. Wings are level and plane
falls to either side
randomly in Hammerhead.
B. Falls off to left in both
inside and outside loops.
Worsens as loops lighten.
loops. Worsens as loops
tighten.
D. Falls off in opposite
directions on inside
and outside loops.
A. Climb continues along
same path.
B. Nose tends to go to
inside loop.
outside loop.
A. Models tends to veer
in nose up direction.
down direction.
If A, trim is correct.
If B, add weight to right
wing tip.
If C, add weight to left
wing tip.
If D, change aileron trim.3
If A, trim is correct.
If B, raise both ailerons
very slightly.
If C, lower both ailerons
very slightly.
If A, reduce wing incidence.
If B, increase wing incidence.
1. Engine thrust angle and C.G. interact. Check both.
2. Yaw and laterai balance produce similar symptoms. Note that fin may be crooked. Right and left references are from
the plane's vantage point.
3. Ailerons cannot always be trimmed without sealing the hinge gap.
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