ASSEMBLY MANUAL XAIR F May,19, 2009
MANUEL DE MONTAGE XAIR F 19 Mai 2009 Page 64 / 84
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H/ FINAL TUNING OF CONTROLS CONTROL AND SUR-
FACES
This stage is all too often neglected. Yet, these adjustments make all the difference between an
aircraft that gives smooth, coherent response, and a cantankerous, even dangerous beast.
1)The elevator:
Make sure the pivot bolts are not too tight against the washers.
Elevator trim tab: first of all, check it responds in the right direction! Push the trim lever forward:
the tab should move up (so as to push the elevator down, for a nose down response).
Second, adjust the cables so that the trim tab is in line with the elevator when the handle is verti-
cal. The trim cables must be tight, but don’t go to excess; number of turns wrapped on the pulley:
2 1/2. Do not apply any lubricant: here, the more friction, the better! You also need a small screw
to stop the cable from slipping.
2) The ailerons:
See Chapter F3
3)The flaps:
See Chapter F3
4) Rudder tab
(N°146)
it corrects engine torque effects. Mount it after the first trial flights if necessary.
5) The rudder:
First of all, and once again, because this bears repeating, make sure that:
THE RUDDER CABLES ARE CROSSED!!
The cables will be under slight tension when the rudder is centered; slack in all other positions is
normal.
When the pedals are lined up, the rudder should be in line with the longitudinal axis of the air-
craft: the easiest way to get this is to clamp the rudder between two cleats and set the adjustable
links so that:
- the nose wheel is in line with the longitudinal axis
- the pedals are lined up
- the cables are slightly taut
Watch out those pulleys! The pulleys at the after end of the keel must be installed so that they
cannot move off of their bearings: the red mark must be visible from outside, (only this way will
the bearing keep the pulley in place).
6) Lubrication:
The ideal lubricant is a silicone spray (if unavailable, you can use a WD-40 equivalent,
but it is not so clean); apply to all points likely to create unwanted friction: control tube washers
and pivots, elevator and rudder hinges, aileron and pedal bearings, all pivot bolts of sticks and
parallelogram, as well as the fork main axle during assembly.
In short, to obtain smooth, precise controls, you need: barely taut cables, barely tight
bolts, and regular lubrication.
H4
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