41
Aircraft Flight Trimming Chart
To test for Test Procedure Observations Adjustments
9. Aileron differential Method 1: y model toward you &
pull into a vertical climb before it
reaches you. Neutralize controls,
then half-roll the model.
Method 2: y model on normal
pass
and do three or more rolls
Method 3: y the model straight
and
level and gently rock the aileron
stick back and forth
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 ies 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. 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
10. Dihedral Method 1: Fly the model on
normal
pass and roll into knife-edge
ight;
maintain ight with top rudder (do
this test in both left & right
knifeedge
ight)
Method 2: Apply rudder in level
ight
A. Model has no tendency to roll
B. Model rolls in direction of ap-
plied rudder
C. Model rolls in opposite direc-
tion 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%
A. Elevators in correct
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 the 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 in
knife-edge ight
Fly the model as in Test 10 A. There is no pitch up or down
B. The nose pitches up (the
model climbs
to its top side)
C. Nose pitches down (model
dives to its
bottom side)
A. No adjustment needed
B. Alternate cures:
1) move CG back;
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.
To Next Page
Loading...
Need help?
General
