Specifications

Page 41
TRIM CHART
After you have test-own and done the initial trim changes to the aircraft, use this trim chart to begin trimming your aircraft. Following
and adhering to this chart will result in the ability to diagnose trim problems and correct those problems using the simple adjustments
shown below. Making these observations and related corrections will result in an aircraft that tracks straighter and ies truer.
TRIM FEATURE MANEUVER OBSERVATION CORRECTION
Control Centreing Fl y ge n e ral ci r c l e s and ra n d o m
maneuvres
Try for hands off straight and level
ight
Readjust linkages so the transmitter trim
levers are centered
Control Throws Fly random maneuvres A) Co ntrol s a re to o s ensit ive or
aircraft feels 'jerky'
B) Controls are not sensitive enough
or aircraft feels 'mushy'
If A) A d j u s t l i n ka ge s t o r e d u c e
control throws or use exponential
If B) Adj u st li nka ges t o i n cr eas e
control throws
Engine Thrust Angle* From straight and level ight, quickly
chop the throttle for a short distance
A) Air cra ft co n ti n ue s i n a le ve l
attitude for a short distance
B) Aircraft pitches nose up
C) Aircraft pitches nose down
If A) Engine thrust angle is correct
If B) Decrease engine down thrust
If C) Increase engine down thrust
Centre of Gravity From level ight, roll to a 45º bank and
neutralise the controls
A) Aircraft continues in the bank for
a short distance
B) Nose pitches up
C) Nose pitches down
If A) Center of gravity is correct
If B) Add nose weight
If C) Remove nose weight or add tail
weight
Yaw** Into the wind, perform inside loops
usi ng only elev ator. Repeat test
performing outside loops from an
inverted entry
A) Wing is level throughout
B) Aircraft yaws to right in both inside
and outside loops
C) Aircraft yaws to left in both inside
and outside loops
D) Aircraft yaws to the right in inside
lo op s a n d y aw s t o t he le f t i n
outside loops
E) Aircraft yaws to the left in inside
loops and yaws to the right in
outside loops
If A) Trim settings are 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** Into the wind, perform tight inside loops
using only elevator
A) Wing is level and aircraft falls
to either side
B) Ai r craft f a l ls of f to th e le f t .
Worsens as loops tighten
C) Air cra ft fa lls off t o t he ri ght .
Worsens as loops tighten
If A) Lateral balance is correct
If B) Add weight to right wing tip
If C) Add weight to left wing tip
Aileron Control System With the wing level, pull to a vertical
climb and neutralise the controls
A) Climb continues along the same
path
B) Nose tends to go toward an inside
loop
C) N o s e t en d s t o g o t o w ar d a n
outside loop
If A) Trim settings are correct
If B) Raise both ailerons very slightly
If C) Lower both ailerons very slightly
*Engine thrust angle and center of gravity interact. Check both.
**Yaw and lateral balance produce similar symptoms. Note that the n may be crooked. Make certain both elevator halves are even with each other
and that they both produce the same amount of control deection throughout the entire deection range. Right and left references are as if you were
sitting in the cockpit.