6
retainer screws (23). Thread the steel pushrods through the pushrod connector mounted on the servo, and
cut them to length. Apply a drop of UHU thread-lock fluid to the M3 grubscrew (21) before fitting them in the
pushrod connectors. Set the control surfaces exactly to centre, then tighten the grubscrew fully.
Fuselage construction is completed when you screw the V-tail to its mount.
The wing
The first step is to cut away the covering film over the servo wells and the servo cable openings at the wing
root.
Place each aileron servo in a piece of heat-shrink sleeve and shrink the sleeve round the case. Carefully cut
away the sleeve to expose the output shaft.
Mark the position of the aileron horns (29) on the ailerons (see plan). Drill a 3 mm Ø hole at the marked point
on each aileron and remove the film over the area of the horn base. Cut the horn spigot to length as shown,
and glue the horns in the holes.
The picture shows one aileron servo glued in the wing. Note that the servo output arm (32) is angled forward
by 15° at neutral; this can be carried out from the transmitter or using a servo tester, and provides additional
travel for the airbrake function. It is also important that the right and left servos are set up exactly identically.
Cut out the aileron servo well covers (33) and stick them in place using the cover retainers (34). Clean the
film surface by wiping with methylated spirits (“meths”) on a cloth before sticking these parts in place. At the
same time you can cut out the individual decals and apply them to the model.
Installing the RC system
The illustration shows the two aileron servo extension leads already connected to the receiver.
The position of the remaining receiving system components is shown on the plan. Refer to the operating
instructions supplied with your radio control system when connecting the servos. Run the receiver aerial out
of a 2 mm Ø hole in the underside of the fuselage and tape it to a point about half-way along the fuselage.
Charge the flight battery fully and fit it in the fuselage. Switch on the radio control system and check each
working system in turn. If you have used the stated linkage holes the elevator travels will automatically be
correct when servo throw is set to 100%. The aileron and airbrake travels are stated on the plan.
Balancing
The correct CG position is under the wing spar, i.e. 50 mm aft of the wing root leading edge. If necessary,
adjust the location of the flight battery until the model balances correctly.
Flying
Give the model a powerful hand-launch with the motor running at full throttle. Launch exactly into the breeze
with the nose inclined up by about 30°. Initially allow the model to climb straight ahead to a height of about
50 metres, then switch off the motor and watch the glide carefully. Adjust the transmitter trims as required.
Keep control commands small and gradual at first, until you feel familiar with the model’s handling in the air.
Always land directly into wind, preferably on a flat expanse of closely mown grass. Allow the model to
approach at its normal gliding speed with the motor switched off, then apply gentle up-elevator just before
touch-down to reduce speed and flare out.
All of us at Graupner hope you have many fine flights with your PESO QR.
October 2003