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Actuating the ailerons and/or landing flaps
The linkage to each control surface is based on a pre-formed
steel rod 42, a threaded coupler 37, a locknut 38 and a clevis
36. The connection to the control surface is by means of the
screw-fitting horns 43, spreader plates 40 and two screws 41.
If you decide to actuate the supplementary control surfaces,
the linkage components required are to be found in the
MULTIPLEX accessory range.
Fig. 15
Uncovered version: at this point the bare wooden parts
have to be covered, and for this we recommend iron-on film.
Please refer to the appendix for details of the covering
procedure, together with many useful hints and tips.
Leave the trailing edge about 1 - 1.5 mm thick and "square".
Don't round off the trailing edge, as the thicker, sharp-edged
trailing edge is almost as efficient as a razor-sharp one, but is
much more durable for general flying, especially if film-
covered.
The basic structure of the model is now complete.
Electrical connection, wing / fuselage
The alpha junior / club has up to four wing-mounted servos
which have to be connected to the receiver. They are
connected at the fuselage / wing transition using grey 5-pin
MPX plugs and sockets.
It is important that all the wing-mounted servo cables should
be fitted with separation filters. Cable sets including all the
parts required together with detailed instructions are
available under the following Order Numbers:
Cable Set MPX
Cable Set UNI
Be sure to select the best quality connectors you can find.
Stick to genuine MPX connectors with gold-plated
contacts!
Connect all the positive wires to a common connector pin,
and do the same with all the negative wires to a different pin.
A separate contact is required for each signal wire.
If you have to connect two servos for each wing you will need
to use four contacts of the 5-pin plug (1 x positive, 1 x
negative and 2 x signal).
The connectors are installed "loose", i.e. the plugs (wings)
and sockets (fuselage) are not glued in place permanently.
Always grasp the connector by the plastic body when
disconnecting - don't pull on the wires!
Remember to mark the plugs and sockets L and R to avoid
confusion at the flying site (use a waterproof felt-tip pen).
Cut an opening for the cables at a suitable point in the
fuselage wing saddle. This is best done by drilling a series of
holes close together, then linking the holes with a hacksaw
blade and filing out to size. Avoid sharp or rough edges, keep
all radii large, and don't make the hole larger than is necessary.
[Fig. 16]
Your model is now complete.
Nevertheless, there are a few important points to be checked
while you are still in the workshop:
Centre of Gravity (balance point) and longitudinal dihedral.
Provided that you get these two settings right you will
encounter no problems in test-flying your new model and in
general flying.
8 5255 (2 x)
8 5253 (2 x)
Successful test flying always boils down to good
preparation.
At Multiplex the CG and longitudinal dihedral are first
determined theoretically, then confirmed by practical flight
testing.
Centre of Gravity:
alpha junior
alpha club
The easy way of checking this accurately it to use the Centre
of Gravity balance, MPX Order No. 69 3054.
A longitudinal dihedral of 2º has proved just right for these
models, and this can be checked using the incidence gauge,
MPX Order No. 69 3053.
We strongly recommend that you stick to these settings. The
control surface travels stated below have been established
as the ideal values during practical test flying, and have been
confirmed by several experienced model pilots. Set these
travels for the time being, and alter them as and when you
see fit. We are confident that you will never need to change
them.
Control surface travels
All control surface travels are measured at the widest point
of the surface, and are stated below in millimetres.
Control surface travels, alpha junior
Rudder servo
Rudder
Elevator servo
Elevator
Aileron servos (optional) Ailerons
Landing flap servos (optional)
Control surface travels, alpha club
Rudder servo
Rudder
Elevator servo
Elevator
Aileron servos
Ailerons
Landing flap servos (optional) Landing flaps 90º
Now your alpha junior / club is ready for the air!
Preparing for the first flight
"Old hands" will now be waiting for the first opportunity to
take their new alpha junior / club to the flying site, where
they will test-fly it in the accustomed manner, carry out any
minor corrections required, and then, we hope, have many
hours of pleasure flying their new model.
The following is intended to help the less experienced
modeller to test-fly and trim the model correctly, and to
exploit the model's fine performance to the full.
Test flying
Every flying machine, from the humble chuck glider to the
full-size aircraft, has to be test-flown and trimmed after
completion; your alpha junior / club is no exception. The
slightest inaccuracy in construction can lead to a minor
variation in the model's flight characteristics and control
response. Test flying is the process of optimising the CG, and
of fine-tuning the model's control response.
Avoid at all costs repeated hand-glides on a flat site. The
60 mm
70 mm
left / right mm
20
20
down / up mm
7
10
down / up mm
8
12
down / up
90º
0
left / right mm
20
20
down / up mm
7
10
down / up mm
8
12
down / up
0
1 7
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