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TRIM FEATURE
MANEUVERS
CONTROL
Fly general circles and
CENTERING
random maneuvers.
CONTROL
Random maneuvers
THROWS
ENGINE
From straight flight,
THRUST
chop throttle quickly.
ANGLE
1
CENTER OF
From level flight roll to
GRAVITY
45° bank and neutralize
LONGITUDINAL
controls.
BALANCE
YAW
2
Into wind, do open loops,
using only elevator.
Repeat tests doing
outside loops from
inverted entry.
LATERAL
Into wind, do tight inside
BALANCE
loops.
AILERON
With wings level, pull
RIGGING
to vertical climb and
neutralize controls.
1. Engine thrust angle and C.G. interact. Check both.
2. Yaw and lateral balance produce similar symptoms. Note that fin may be crooked. Right and left references are from the plane's vantage point.
OBSERVATIONS
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.
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 in insides,
and right on outside
loops.
A. Wings are level and
plane falls to either side
randomly.
B. Falls off to left in loops.
Worsens as loops
tighten.
C. Falls off to right in
loops. Worsens as
loops tighten.
A. Climb continues along
same path.
B. Nose tends to go to
inside loop.
C. Nose tends to go to
outside loop.
38
CORRECTIONS
Readjust linkages so that
Tx trims are centered.
If A, change linkages to
reduce throws.
If B, increase throws.
If A, trim is okay.
If B, decrease downthrust.
If C, increase downthrust.
If A, trim is good.
If B, add nose weight.
If C, remove nose weight.
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.
If A, trim is correct.
If B, add weight to right
wing tip.
If C, add weight to left
wing tip.
If A, trim is correct.
If B, raise both ailerons
very slightly.
If C, lower both ailerons
very slightly.
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