HITEC OPTIC 6 - Aircraft Flight Trimming Chart

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A
ircraft Fli
g
ht Trimmin
g
Chart
To test for... Test Procedure Observations Ad
j
ustments
9. Aileron
differential
Method 1: fly model toward
you
& pull into a vertical
climb
before it reaches you.
Neutralize
controls, then
half-roll
the model.
A
. No heading changes
B.
Heading change opposite to roll
command
(i.e. heading veers left
after
right roll)
C. Heading change in direction of roll
command
A
. Differential settings OK
B.
Increase differential
C. Decrease differential
Method 2: fly model on normal
pass
and do three or more
rolls
A
. Roll axis on model centerline
B.
Roll axis off to same side of mode
l
as roll command (i.e. right roll, rol
l
axis off right wing tip)
C. Roll axis off to opposite side of
model
as roll command
A
. Differential settings OK
B.
Increase differential
C. Decrease differential
Method 3: fl
y
the model strai
g
ht A. Model flies strai
g
ht ahead without
A
. Differential settin
g
s OK
and
level and gently rock the
aileron
stick back and forth
yawing
B.
Model yaws away from roll
command
(i.e. right roll, yaw left)
C. Model yaws towards roll command
(
i.e. ri
g
ht roll,
y
aw ri
g
ht
)
B. Increase differential
C.
Decrease differential
10.
Dihedral Method 1: Fly the model on
normal
pass and roll into
knife-edge
flight; maintain
flight
with top rudder (do
this
test in both left & right
knife-edge
flight)
Method 2: Apply rudder in
level
flight
A
. Model has no tendency to roll
B.
Model rolls in direction of applied
rudder
C. Model rolls in opposite direction in
both
tests
A
. Dihedral OK
B1. Reduce dihedral
B2. Use mixer to produce
aileron
opposing rudder
travel
(start with 10%)
C1. Increase dihedral
C2. Mix ailerons with rudder
direction
10%
11. Elevator
alignment
(for models
with
independent
elevator
halves)
Fly the model as in Test 6
and pull up into an inside loop
.
Roll it inverted and repeat th
e
above by pushing it up into
an outside loop.
A
. No rolling tendency when elevator
applied
B. Model rolls in same direction in both
tests
- halves misaligned.
C. Model rolls opposite directions in
both
tests. One elevator half has
more
throw than the other (model
rolls
to side with most throw).
A
. Elevators in correct
alignment
B. Either raise one half, or
lower
the other
C. Reduce throw on one side,
or
increase throw on the
other.
12. Pitching i
n
knife-edge
flight
Fl
y
the model as in Test 10
A
. There is no pitch up o
r
down
B.
The nose pitches up (the model
climbs
laterally)
C. Nose pitches down (model dives
laterally)
A
. No adjustment needed
B.
Alternate cures:
1) move CG aft;
2) increase incidence;
3) droop ailerons;
4) mix down elevator with
rudder
C. Reverse 'B' above
*Trim
tab is 3/16" x 3/4" x 4" trailing edge stock, placed just in front of aileron on bottom, pointed end forward.
Aircraf
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Fli
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