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Bo 105
CBS
1. Montage
1.1 Assembling the model
1.1 Preparation, explanatory notes
The numbers in (brackets) refer to the part numbers as printed in the parts list (see end of
instructions).
The fuselages are hand-moulded and are likely to exhibit minor variations and irregularities on
the inside, especially along the central joint seam. Before finally installing any part check
carefully that it fits, trim where necessary and carry out a „dry run" (without glue). Take your
time and work steadily and patiently. All screwed joints except those involving plastic and those
with self-locking nuts must be secured with thread-lock fluid; this is a basic rule, and is not
mentioned at every stage in the instructions.
Where extra items and accessory components are used they should be prepared and installed
as described in the instructions supplied with them.
1.1.1 Mechanics
In these instructions we assume that the main mechanical system for the model is already
completely assembled. It is a good idea to remove the silencer and manifold from the motor,
and temporarily remove the rotor head from the mast, as this makes it easier to trial-fit and
install the system in the fuselage. We recommend the use of the optional silencer console
(4450.149) which supports the silencer against the mechanics.
As the mechanical system is screwed in place from above, the skid attachment brackets
1291.21A (with insert) must either be drilled out to 3 mm Ø, or replaced with the skid attachment
brackets 1291.21 (no insert). These must be installed with the recessed hole facing up.
You will need a 2.5 mm allen key about 30 cm long to install these parts. If you cannot obtain
such a tool, you can make one yourself by extending a standard allen key with a brass tubing
shank.
Important:
As in the full-size helicopter, the main mechanical system is installed inclined to
the left, viewed from the tail, to avoid the fuselage „leaning" in the hover.
However, to ensure that the main rotor shaft still exits the fuselage on the
centreline, the system is offset to the right at the bottom of the fuselage. To allow
for this the bulkheads are asymmetrical, and it is very important that they should
be installed the right way round. To avoid mistakes we suggest that you write
„right" and „left" on all the bulkheads with a pencil.
1.1.2 Fuselage
Glued joints: the GRP parts must be thoroughly roughened at all joint positions using coarse
abrasive paper; this is the only way to ensure that the glued joints are really strong and durable.
Almost all fuselage openings for windows, cooling air etc. are pre-cut, and the various holes
required for other screwed joints are described in the course of the instructions. Where parts
have to be glued to the inside of the fuselage it is best to apply the glue using a long strip of
wood or similar tool. All internal wooden parts must be fuel-proofed before installation; a good
method is to impregnate them with cyano glue.
The upper fuselage fairing and tail cap have to be trimmed carefully to obtain a neat fit on the
main fuselage moulding. Trim the machined openings in the fuselage where necessary, and
sand them smooth using fine abrasive paper; leave an even flange all round the window
openings to support the glazing panels.
1.2 Preparing the skid landing gear
Drill 3 mm Ø holes in the skid tubes as shown, drilling vertically and precisely from above. The
holes must be exactly 282 mm apart, with the rear holes located 25 mm from the rear end of the
skid. Open up the holes on the underside of the skid tubes only to a diameter of 6 mm.
Assemble the skid tubes and skid bars on a flat surface to produce the skid landing gear, and
temporarily join the parts with thin cyano. Ensure that the skid tubes are parallel to each other
and exactly vertical, and that the shoulders of the skid bars are centred accurately over the
holes.
Caution: the front and rear skid bars are of different height; the taller bar is the front one.
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