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Lift and Centre ol Gravity at different speeds. We must point out,
however, that this method represents a fine -tuning procedure'
and it will fail completely if you have made gross errors in cons-
truction, or iI the average CG position shown has not been ad-
hered to.
Place the model in a steep dive (about 50 degrees) by holding in
down - elevator for two or three seconds. Release the stick. lf
the model is balanced correctly, it will recover from the dive by
itself in a broad, gentle curve. lf the model immediately balloons
up when you release the stick, then the CG is too far forward
Land the model. remove nose ballast, and apply a little down
elevator trim.
It the model shows no tendency to recover lrom the dive at all -
the dive may even tend to get steeper - then immediately extend
the airbrakes and recover with gentle up-elevator. The CG is
too far aft. Add nose ballast, and set slight up elevator trim
In order to obtain worthwhile results, changes in nose ballast
should be made in increments of at least 10 grams, but not more
than 40 grams.
Never attempt to fly circles or steep turns on the landing ap-
oroach at low altitude. Extreme angles of bank close to the
ground are a recipe for disaster. The approach angle can be
controlled very precisely by using the airbrakes. The brakes are
also uselul on aero - tow and for aerobatics: on tow, the model's
altitude relative to the tug can be controlled, and in aerobatic
flying you can reduce speed quickly by extending the brakes. lf
the model climbs dangerously high in powerful lift, the brakes
wl'i quickly and safely pull the model down again.
ll
.r have installed two aileron servos you have the possibility -
assuming that your radio has the lacilities - of making the aile-
rons double as camber-changing flaps. Maximum tlap move-
ment should be no more than about 4 mm down. When the aile-
rons are dellected down the maximum lift of the section is in-
creased slightly, at the expense of reduced aileron response.
Please bear this in mind if you lower the flaps close to the
ground. Larger flap movements otfer no advantage. With tlaps
drooped the model is better able lo exploit light lift. Allow your-
self many tlights to explore and master the model's flying cha-
racteristics and control responses, untilyou are contident that
you are able to get the best out ol it.
Using the plug - in wing extensions
The wing extensions increase the litt-producing area of the
wing at the cost of a slight increase in drag. Fitting them is ad-
van[ageous for flying in thermals, light wind conditions and lor
distance llights.
For fast flying (aerobatics, strong winds and slope soaring) the
extensions should be removed (both sides), and replaced with
the plug - in wingtips. This raises the model's cruising speed
and manoeuvrability.
The variable wingspan due to the plug - in wing extensions wid-
ens the model's speed range, and thus the range of conditions
in which it can be flown. This is exactly the same advantage as it
confers in the full- size.
In our experience, if you fit or remove the wing extensions dur-
ing a llying session it takes a little time to get used to the new
configuration before you are able to get maximum performance
agarn.
Please take the trouble to learn to use the extra lacilities - the
ballast tubes, flaps and plug - in tip extensions. After a little ex-
perimentation you will be able to match your model accurately
to the prevailing conditions.
Please bear safely in mind at all times when f lying your new mo-
del. Exercising control over a model aircraft calls for a high awa-
reness of responsibility trom the pilot. Never fly in such a way
that you endanger or annoy other people.
Get to know your model over many hours of flying, and you will
gradually gain an awareness of the possibilities of this highly re-
Iined model. We guarantee that you will experience the true fas-
cination of flight with lhis superb glider. In ridge litt at the slope'
or riding the thermals ataflatfield site, the Alpina magic willthrill
you with its appearance in the air, its splendid performance, and
its docile handling.
We wish you many hours of pleasure with your Alpina ,ragiq
and as many successful landings as launches.
Your MULTIPLEX team
MULTIPLEX Modelltechnik GmbH
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