24
the ailerons. Connect the pre-formed aileron pushrods 28 to the
outermost hole in the servo output arms. At the other end slip the
wire pushrod 28 through the barrel 25 of the swivel connector.
Set the servos and the ailerons to centre, and tighten the
grubscrews 26 in the barrels to secure the pushrods.
Fig. 29
21. Concealing the aileron servos
Since the wings are extremely thin, the servos are installed flush
with the top surface of the airfoil. For aerodynamic reasons (and
to improve appearance) they should be covered using the thin,
rigid, self-adhesive stickers 26.
Fig. 30
22. Aileron pushrod fairings
The servo fairings 44 + 45 can now be fitted; they further improve
aerodynamic efficiency as well as protecting the aileron pushrods
(actually it is the servo gears which need protection).
Fig. 31
23. Fitting out the glider version
If you intend to fly your Blizzard at the slope, the simple option is
just to launch the model with the motor switched off; this provides
you with an emergency ‘get-you-home’ aid if the lift drops dead.
However, if you wish to make good use of weak lift, or if you are
simply a dedicated glider fan, the installation of a motor will be
unacceptable to you.
In this case attach the glider nose-cone 42 to the fuselage by
fitting the two screws 33 from the inside. The receiver battery
(e.g. # 16 6052) should be installed in the motor compartment.
The completed model will weigh about 200 g less than the
electric version.
24. Motor installation
Two power sets are available for the Blizzard: the standard
system, # 33 2639, offers an input power of 280 W, and is quite
powerful enough for a brisk style of flying. However, things really
start moving with the Tuning power system, # 33 2643, with an
input power of 470 W. In the latter case the pilot should certainly
have prior experience with fast ‘full-house’ models. The power
systems are installed as shown in Figs. 33 + 34.
Please note:
For the Tuning power system you must use the spacer ring 43.
If you wish to use a different motor, you should stay within the
power range 250 - 500 Watts. We strongly recommend that
you use the MPX spinner and driver as it looks good and
promotes efficient cooling.
Spinner and driver for 4 mm Ø shaft # 73 3501
Spinner and driver for 5 mm Ø shaft # 73 3502
25. The canopy
Apply cyano to the canopy latch tongues 23 and push them into
the sockets in the canopy 12 as far as they will go. Fig. 35
26. Assembling the model
Connect the green M6 socket in the wing to the matching plug in
the fuselage, then fix the wing to the fuselage using the two
countersunk plastic screws 31. Check that everything fits and
lines up correctly. Fig. 36
27. Installing the receiving system components
The system components are installed as shown in Fig. 37. Note
that the receiver is positioned aft of the wing. This means that
the leads must be long enough to enable the servos to be
connected outside the fuselage.
28. Centre of Gravity
Set the correct Centre of Gravity by adjusting the position of the
flight battery and the trim ballast in the ballast chamber.
The correct CG position is around 70 mm aft of the wing root
leading edge. Fig. 38
29. Initial test-run
We assume that all the radio control system components are
installed as shown in Fig. 37, and connected correctly. Use Velcro
tape 20 + 21 to secure the components.
Check the neutral position of the control surfaces and the
direction of rotation of the servos. All the control systems must
operate freely, without binding. Check the direction of rotation of
the motor shaft, and reverse it if necessary.
30. Settings (guideline only!):
Centre of Gravity: 70 mm aft of the wing
root leading edge
Longitudinal dihedral: 1°
Motor downthrust: 6°
Motor sidethrust: 0°
Control surface travels:
Measured at the broadest chord of the control surfaces
Ailerons: 14 / 6 mm +/-
Elevator: 5 / 5 mm +/-
Rudder: 7 / 5 mm +/-
Flaps: 2 mm down
Spoilers: 12 mm up
Snap-flap: 2 mm up
Elevator compensation
Spoilers 0.5 mm ‘down’
Flap max. 1 mm ‘up’
Power 0.5 mm ‘down’
Expo, elevator: 30%
31. Test-flying:
Wait for a day with little or no wind.
Carry out all the basic adjustments in the peace and quiet of
your workshop!
The basic rules:
Snap-flaps negative and max. 2 mm
No speed flying with flaps deployed (i.e. neutral only)
Longitudinal dihedral = 1°; this is pre-set by the model’s
construction
Centre of Gravity:
Start by balancing the model within the stated range. Once you
have completed the test-flying schedule, you can fine-tune the
setting as follows: fly straight and level at half-throttle, and roll
the model inverted. If you now have to apply a great deal of ‘down’
to hold level flight, the model is nose-heavy; the CG must be
shifted further aft. If the machine climbs whilst inverted, without
requiring elevator correction, the CG is too far aft. When balanced
correctly, the model will require slight down-elevator for level
inverted flight.
Correcting straight and level flight:
First the static balance: hold the model inverted, and support it
by the spinner and the tail end of the fuselage: with the fuselage
level, the wings should remain horizontal. If not, add ballast to
the lighter wingtip.
On the next flight, fly the aeroplane at minimum throttle (just
