Receiver Aerial; Centre Of Gravity - GRAUPNER Bell 230 Bedienungsanleitung

Bell 230
The window set also includes the two dummy exhausts moulded in smoked-tint plastic. Cut
them out leaving a flange about 5 mm wide all round, and open them up at the ends. You can
achieve a very realistic impression by painting the inside of the exhaust pipes with an airbrush
or spray can; start with a thin (non-covering) copper colour, then silver, and finally matt black.
The completed exhaust pipes can then be glued to a piece of the self-adhesive foam supplied;
glue them to the top surface using cyano - not the self-adhesive side. These foam pieces can
then be cut out flush with the edge of the dummy exhausts. Now peel off the backing film from
the foam and stick them on another piece of foam, cut much larger all round than the exhausts,
adhesive face to adhesive face. The exhaust pipes can now be fitted through the pre-cut
openings in the top of the fuselage (after trimming the openings and smoothing the edges), and
pressed into position; the adhesive on the larger piece of foam will stick the exhausts in place.
Compared with a rigid installation this has the advantage that the thin-walled pipes will "give" in
a hard landing, instead of breaking off or tearing.
The air inlet grilles can simply be glued over the inside of the openings in the top fuselage
fairing. If you wish, you can also cut out the moulded-in dummy grilles in the top of the fuselage,
and seal them using more of the grille material.

1.14 Receiver aerial

The receiver aerial should be deployed as follows:
You will find slots in the sides of the battery console through which cable ties can be fitted to
retain a plastic guide tube (Order No. 3593) in which the aerial can reside. Slip the aerial in the
tube and arrange it as shown in the drawing: fix one end at front right and then run it forward in
as broad a curve as possible through the nose of the fuselage, then to the left-hand side of the
battery console (fix it there with a cable tie), then back along the mechanics sub-structure and
finally up to a point below the fan housing. Attach the tube to the mechanics using additional
cable ties as required.
The advantage of this method of aerial deployment is twofold: on the one hand the aerial is fixed
to the mechanics only, and therefore forms a compact unit which can be installed and removed
easily; on the other hand it is well clear of any mechanical components which could radiate
electrical noise, and forms an efficient receiving plane in all directions.

1.15 Centre of Gravity

The Centre of Gravity should be located 0 - 5 mm in front of the forward edge of the main rotor
shaft; you may need to install lead ballast to achieve this. To check the CG set the rotor blades
at right-angles to the fuselage centreline, raise the helicopter by the blade holders and tip it on
its side through 90°: if the CG is correct, the nose of the helicopter will now swing slowly
downwards.
22