Installing The Radio Control System; Installing The Servos - GRAUPNER heim UNI-Mechanik 2000 Mode D'emploi

UNI-Mechanics 2000
Make up the pushrods as shown in the drawing from three threaded rods 1291.10 (2.5 mm Ø,
75 mm long) and six ball-links 4618.155; the stated dimension refers to the free space between
the ball-links.
The first pushrod is used for the rear swashplate linkage; fit the ball-link over the guide spigot
mounted on the swashplate 4682.45, and press it onto the linkage ball at the base of the spigot.
Fit the brass sleeve (from 4618.113) on the guide spigot and grease it well. Slide the
swashplate onto the main rotor shaft, and thread the connected pushrod down through the hole
in the rear of the dome bearing holder; carefully ease the swashplate guide 4618.113 back, and
allow the brass sleeve on the swashplate guide spigot to engage in the channel in the
swashplate guide.
Fit the collective pitch compensator on the main rotor shaft, and press the two ball-links onto the
appropriate balls on the inner ring of the swashplate, as shown in the illustration.

2. Installing the radio control system

(bag U2-9)

2.1 Installing the servos

Fit brass linkage balls on the inside face of the output arms of the pitch-axis servo (1) and the
roll servos (2) + (3) using M2 x 10 cheesehead screws, and secure each one with an M2 nut
fitted on the outside. Apply thread-lock fluid between the screws and the balls, and also in the
nuts. The distance from the servo output shaft axis to the ball centre should be around 18 mm.
Install the pitch-axis servo in the rectangular opening in the right-hand side frame, working from
the inside; the output shaft must be at the top. Secure the servo with four screws, rubber
grommets and tubular rivets (these items are supplied with the servos): the tubular rivets are
pressed into the underside of the rubber grommets, and the screws fitted from the top.
The holes in the mechanics for the servo mounting screws are deliberately offset slightly
towards the outside, so that the rubber grommets are under slight tension when the screws are
fitted. This helps to produce precise control response.
Both the roll-axis servos are fitted in the right and left side frames working from the outside,
again with the output shafts at the top (see drawing). Secure each servo with four screws as
before. Connect the servos to the receiver in the sequence described in the RC system
instructions, switch on the radio control system and activate the swashplate mixer at the
transmitter (setting: symmetrical three-point linkage, two roll-axis servos, one pitch-axis servo at
the rear). Set the collective pitch, pitch-axis and roll-axis controls to neutral (centre) and fit the
output arms on the servos at right-angles to the rotor shaft. Secure them with the servo output
screws.
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