FUTABA 8UHPS Instruction Manual page 69

To test for _ Test Procedure
9. Aileron Method 1: fly model toward you
differential & pull into a vertical climb
before it reaches you.
Neutralize controls, then half-
roll the model.
Method 2: fly model on normal
pass and do three or more
rolls
Method 3: fly the model straight
and level and gently rock the
aileron stick back and forth
10. Method 1: Fly the model on
Dihedral 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
11. Elevator Fly the model as in Test 6 and
alignment pull up into an inside loop. Roll
(for models it inverted and repeat the above
with by pushing it up into an outside
independent loop.
elevator
halves)
12. Fly the model as in Test 10
Pitching in
knife-edge
flight
*Trim tab is 3/16" x 3/4" x 4" trailing edge stock, placed just in front of aileron on bottom, pointed end forward.
Observations
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. Roll axis on model centerline
B. Roll axis off to same side of
model as roll command (i.e. right
roll, roll axis off right wing tip)
C. Roll axis off to opposite side of
model as roll command
A. Model flies straight ahead
without yawing
B. Model yaws away from roll
command (i.e. right roll, yaw left)
C. Model yaws towards roll
command (i.e. right roll, yaw
right)
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. 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. There is no pitch up or down
B. The nose pitches up (the model
climbs laterally)
C. Nose pitches down (model dives
laterally)
66
Adjustments
A. Differential
settings OK
B. Increase
differential
C. Decrease
differential
A. Differential
settings OK
B. Increase
differential
C. Decrease
differential
A. Differential
settings OK
B. Increase
differential
C. Decrease
differential
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%
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.
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