23. Gluing the canopy latch tongues to the canopy
The two latch tongues 23 can now be fitted in the canopy 7 - note
that the two projecting lugs should both face inwards! Apply thick
cyano to the notched areas - this time without activator! - then
insert the latch tongues in the slots in the canopy. Immediately fit
the canopy on the fuselage and engage the latch tongues in the
latch catches 22. Carefully align the canopy with the fuselage -
before the glue sets! Wait for about a minute, then carefully ease
the canopy open again. Apply activator to the joint areas of the
latch tongues to help the cyano to cure. If you are making the
glider variant, use a balsa knife to cut back the front canopy
retainer lug as required to clear the receiver battery you are using.
Figs. 29 + 30
Radio installation - both versions
The rest of the receiving system components can now be
installed in the cabin area. Do bear in mind the stated Centre of
Gravity (CG) when positioning the receiver and battery. You can
adjust the model's balance point if required by re-positioning
the batteries.
Hook-and-loop tape 20 + 21 is supplied in the kit for securing
these components. Note that the adhesive on the tape does not
adhere very strongly, so be sure to fix the tape in the fuselage
using cyano.
In both versions the receiver should be installed aft of the servos,
and secured using hook-and-loop tape. Draw the receiver aerial
through the plastic sleeve 47 (already installed). The easiest
method of doing this is to prepare a length of thin steel wire with
a pointed tip, and slip it through the aerial sleeve 32 from the tail
end. Push the tip inside the insulation of the aerial wire, apply a
tiny drop of cyano to join the two together temporarily, then draw
the aerial through the sleeve by pulling on the wire from the tail
end.
Figs. 31 + 32
Installing the receiving system in the electric-powered version
The motor supplied in the kit features internal suppressors, and
these are adequate if you are using a MULTIcont X-16 speed
controller, # 7 2271.
If you prefer to use a different controller, it is in your own interests
to fit additional suppression measures to the electric motor. A
suitable suppressor set is available under # 8 5020. Solder one
47 nF capacitor between one motor terminal and the motor can,
and a second one between the other terminal and the can. The
third 47 nF capacitor should be soldered across the terminals to
form a bridge.
Solder the speed controller cables to the motor's terminals as
follows:
Controller positive (+) wire to motor negative (-) terminal
Controller negative (-) wire to motor positive (+) terminal
The single-stage gearbox reverses the direction of rotation of
the motor, making it necessary to connect the motor "the wrong
way round", as described above. Hold the soldering iron on the
terminals briefly and apply solder at the same time - it is a good
idea to remove the motor from the model before you do this to
avoid heat damage to the plastic parts.
The speed controller should be attached to the fuselage side aft
of the motor. Solder a matching battery connector to the flight
battery cables, and insulate each soldered joint individually with
a piece of heat-shrink tubing.
The flight battery fits under the wing in the compartment aft of the
receiver. As the battery is a tight fit in the compartment, there is
no need to secure it separately. Connect all the components of
the radio control system for testing, referring to the instructions
supplied with the radio control system.
14
Attach the propeller blades 14 to the hub using one spacer sleeve
and one screw each. Tighten the screws fully, but do not over-
tighten them (take great care not to strip the threads - it is very
easily done).
Fig. 31
Don't connect the battery to the speed controller until you
have switched your transmitter on and checked that the throttle
control is set to "OFF".
Switch on the transmitter, connect the flight battery to the controller
in the model, and the controller to the receiver. Your controller
must feature what is known as a BEC circuit (receiver power
supply from the flight battery).
Now switch on the motor briefly from the transmitter, and check
the direction of rotation of the propeller (hold the model firmly
and remove all loose, lightweight items from the area behind
the model before you do this).
Caution: even with small motors and propellers the electric
power system is capable of inflicting serious injury!
Installing the receiving system in the glider version
In addition to the receiver the glider version needs to be fitted
with a switch harness and receiver battery. The receiver switch
fits in a well in the right-hand fuselage shell forward of the servos.
Glue hook-and-loop tape to the receiver battery and the fuselage
bottom, and press the battery into place.
Connect all the components of the radio control system for
testing, referring to the instructions supplied with the radio control
system.
Check that the canopy 7 fits over the receiver battery, and use a
balsa knife to trim back the front retainer lug if necessary. Fit the
canopy on the fuselage.
Fig. 32
Setting the control surface travels
The control surface travels must be set correctly to ensure that
the model has harmonious, well-balanced control response.
The travels are measured at the widest point of each control
surface.
Elevator
up (stick back)
down (stick forward)
Rudder
left and right
Ailerons
up
down
Spoilers - both ailerons up
Elevator mix with spoiler
Fig. 33
Both ailerons can be set to move up simultaneously in order to
provide a "spoiler" function, i.e. to shorten the landing approach.
At the same time a suitable amount of down-elevator trim must
be mixed in to keep the model in a stable attitude. This can only
be done if your radio control system features suitable mixers.
If you are not sure of this, read the instructions supplied with
your radio control system.
Note: when you apply a right aileron command, the right-hand
aileron (as seen from the tail, looking forward) must move up,
the left aileron down.
approx. + 13 mm
approx. - 13 mm
approx.
20 mm
each side of centre
approx. + 20 mm
approx.
- 8 mm
approx. + 20 mm
approx.
- 5 mm