GRAUPNER Heim Eurocopter Bo 105 CBS Mode D'emploi page 66

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Bo 105 CBS
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 inside the fuselage as follows: start 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 regardless of the helicopter's orientation.
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.
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