Flylight Airsports Skyranger Swift, Operator'S Manual

Page: 42 / 56

Skyranger Swift Operators Manual (issue 3)
42
11. Trim and tuning
11.1 WARNING: Any sudden change in Pitch, Roll or Yaw trim characteristics
may indicate airframe damage has occurred. If trim characteristics
change following maintenance then it may indicate incorrect assembly.
The following paragraphs are a guide to small in service adjustments.
11.2 Pitch
Pitch trim is effected by a trim tab on the starboard elevator. Check the
current HADS for deflection angles. The pitch trimmer should be
powerful enough to trim the aircraft for normal flight throughout the
Cg range. Pitch trim is also influenced by the neutral settings of the
flaps and ailerons. If they are set trailing edge up then it has the effect
of trimming nose up, and vice versa. The neutral setting and tolerance
range of Flaps and ailerons are contained in the current HADS.
11.3 Roll.
The aircraft will experience changes in lateral (roll) trim due to
variation in lateral Cg ( for instance when flown solo Vs dual). Different
power settings can also affect lateral trim due to torque effects. Roll
trim should therefore be assessed in straight and level flight at typical
cruise power setting / airspeed, and in balance (slip ball central). If the
aircraft has a persistent tendency to roll then the following
adjustments can be made:
11.3.1Small rolling tendency: this can be tuned out by adjusting the relative
angles of the flaps. This works in the same sense as an aileron
deflection – i.e if aircraft wants to roll left raise the right flap and lower
the left flap. Keep adjustments within the tolerance range specified in
the current HADS.
11.3.2Larger rolling tendency: This can be tuned out by use of different
length wing strut ends. +5 and +10mm ends are available for this use.
Adjustments must always be made so that washout is increased – i.e
longer strut ends must only ever be used in the rear wing struts. They
fit in the outer ends of the wing struts. If aircraft is rolling left fit the
longer strut end to the right wing, and vice versa.