P&M QUIK-GTR Manual, ref. QUIK-GTR Man 1.0.doc
Page 65
11.3. TUNING GUIDE
For successful tuning, the weather conditions must be smooth, small adjustments must be made ONE AT A
TIME, and notes must be made immediately any changes have been made and check flown. The loading of the
aircraft must also be similar for trials to have comparable results.
The settings of the washout rods are critical. If they are too high, roll handling will be adversely affected. If they
are much too high, trim speed will also reduce. If the washout rods are too low, the wing may become unstable
in pitch during turbulence or in steep dives. The washout rod screwed adjusters should
not
be used to attempt to
tune out turns.
11.3.1 Tuning turns
Example
:
The aircraft turns right especially at low speed. The trim speed is correct.
Solution
:
In this case use asymmetric tension in the STARS cords. Tighten the left hand cord slightly using the adjustment
loop by the left hand side of the keel pocket.
Check fly and adjust until the turn is removed.
Example
: At high speed, the aircraft turns to the right. At low speed, the turn is not so pronounced. The trim
speed is correct.
Solution
:
Use ribs numbers 7-9 (the tip rib is number 10 and has very little effect) on the
starboard (right wing)
side to
tune out the turn. The tip ribs respond well to “tab effect”, i.e. application of reflex near to the trailing edge will
produce a downforce at the trailing edge which will increase the incidence of the section as a whole. The overall
effect is to increase the lift on the side where reflex is applied, so correcting the turn. The effect becomes more
pronounced as the speed rises. The reflex should be applied 230mm from the trailing edge and applied in small
increments up to a maximum of 20mm. Start with 5mm reflex, test fly, then adjust in 5mm increments as
required .Do not exceed 20mm reflex!
Never lower the washout rods below the factory setting. See section 12.
If the wing used to fly straight but has recently developed a significant turn, then
the probability is that damage has occurred. It is necessary to strip and inspect
the aircraft before your next flight. Failure to do so may result in injury or death.
WARNING
!
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