GRAUPNER heim Bell 230 Instructions D'utilisation page 44

Bell 230
The two outer formers A15 and A16 can now be fitted in their final position, flush with the
outside edges of the undercarriage opening, and temporarily tacked in place with a few drops of
glue. Press the shaft F32 into the undercarriage leg, and install the leg assembly. Now fit the
inner formers A17 and A18, and check that the pin F3 engages in the channel in the lever F24
on the undercarriage leg. Fit two washers on the outside between the undercarriage leg and the
pivot bush F27, so that the undercarriage does not foul the spoilers F33, which are glued in
place later.
At this stage you should check the fit and operation of the undercarriage, trimming the formers
A17 and A18 as necessary to ensure that the undercarriage legs can be extended and retracted
freely by rotating the aluminium tubes F31; no part of the mechanism should foul or rub against
any other part. In their extended stated the legs should be vertical and exactly parallel to each
other. A good method of checking alignment is to slip a length of steel rod through the right and
left tubular aluminium shafts F31, and check that they are approximately in line with each other.
The retract servos can now be installed in the two formers A7, as shown in the drawings. Note
here that the servo output arm for the right-hand unit must face up, that on the left-hand unit
down, to ensure that both legs extend and retract together, simultaneously with the noseleg unit.
Mount a linkage ball on each arm at a point 18 mm from the pivot axis using an M2 x 8 screw
and nut. Pass the servo leads through the openings located directly under the servos.
Adjust the two formers A7 to fit in the shoulders of the stub wings, so that the cross-formers A20
can be engaged in the position shown in the drawing, at the same time fitting the aluminium
tubes F31, projecting through the appropriate holes. Note that the tubes should be as nearly
central in these holes as possible. We recommend this procedure: bevel the edges of the rear
face of the formers A7, then engage the former A 20 in one former A7, and position this
assembly carefully; now fit the other former A7 in the shoulder of the stub wing, pushing the
fuselage out of shape slightly, until the former A20 also engages in the opening. It is important
that the formers do not force the fuselage sides out of shape when in their final position; trim the
formers slightly if that is the case. Note that the formers must not be glued in place yet; just
ensure that they fit correctly.
Caution: the larger pushrod opening in the former A20 must be on the right-hand side.
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