GREAT PLANES Spectra Gebrauchsanweisung - Seite 11

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The control throws are as follows:

Elevator

1/2" [13mm]

LEFT

Rudder

1-1/2" [38mm]

Balance the Model

Note: This section is very important and must not be

omitted! A model that is not properly balanced will be

unstable and possibly unflyable.

The balance point (C.G.- Center of Gravity) is located directly

under the wing's main spar 3-1/8" [79.5mm] from the LE. This

is the point at which your model should balance for your first

flights. Later, you may wish to shift the balance up to 3/8"

[9.5mm] forward or aft of the spar to change the flying

characteristics of your Spectra ARF. Moving the C.G. forward

of the spar will add some stability to the electric sailplane but

it will decrease its overall performance and increase its stall

speed. Moving the balance behind the spar makes the model

more agile with a lighter and "snapier" feel and improves the

Spectra ARF's response to air currents. It also makes the

model less stable and can cause the model to "tuck under" or

dive when its flying speed increases. If you fly the Spectra

ARF with its C.G. behind the spar, pay close attention and do

not let it gain excessive speed. If it does "tuck under" and you

have plenty of altitude, give the airplane a little "down"

elevator and allow it to go under. When it starts to climb up

back of the outside loop its airspeed will drop and you can pull

out with some "up" elevator or roll out with full rudder. If you

do not have plenty of altitude, gently pull out with "up" elevator

but be careful and do not jerk it up or you may overstress the

wing structure.

With the wing attached to the fuselage, and all parts of the

model installed (ready to fly), lift the model by picking it up with

a finger on each bottom inner spar. If the tail drops when you

lift, the model is "tail heavy" and you must add weight to the

nose to balance. If the nose drops, it is "nose heavy" and you

must add weight to the tail to balance. The model should hang

DOWN

1/2" [13mm]

RIGHT

1-1/2" [38mm]

with a slight nose down attitude. Add lead to the compartment

at the front of the fuselage to correct a tail heavy model.

DO NOT ATTEMPT TO FLY WITHOUT FIRST ACHIEVING

THE PROPER BALANCE.

Checking for Warps

This is a very important step and should be done

occasionally throughout the flying season. A sailplane's

wing is most efficient when it is not twisted or warped at all.

"Washout" (wing trailing edges twisted up at the tip) helps

make a poor wing design fly better by adding some stability

(preventing stalls) at slow speeds but it cuts down on the

wing efficiency at normal speeds. The SPECTRA ARF's

wing is designed to fly well at slow speeds without any

washout, and therefore we recommend you check to make

sure the wings are "flat" using the following procedure:

Set the wing so an inner panel is resting on a flat surface.

Any warp (twist) will show up by causing a corner of the

panel to rise off the work surface.

To remove the warp, gently twist the wing in the opposite

direction while a helper glides an iron or heat gun over the

covering on both the top and the bottom of the panel to re-

shrink the covering. Hold the twist until the covering cools

and then recheck for warps. It may take several tries to get

a warp out but it is worth it as you will end up with a

sailplane that flies straight and true and responds to air

currents like a high performance sailplane should.

Follow the same procedure to check all four wing panels

and then go back and double check them. Sometimes you

put a warp in one panel while trying to fix another. You

should also look at the tail surfaces as they too can warp.

PREFLIGHT

Charge the Batteries

Follow the battery charging procedures in your radio

instruction manual. You should charge your transmitter and

receiver batteries the night before you go flying, and at other

times as recommended by the radio manufacturer. Charge

your motor batteries as recommended by the manufacturer.

Find a Safe Place to Fly

The best place to fly your R/C model is an AMA (Academy

of Model Aeronautics) chartered club field. Ask your hobby

shop dealer if there is such a club in your area and join. Club

fields are set up for R/C flying which makes your outing

safer and more enjoyable. The AMA can also tell you the

name of a club in your area. We recommend that you join

AMA and a local club so you can have a safe place to fly and