Main Rotor Blades; Balancing The Rotor Blades; Installing The Mechanics In The Fuselage - GRAUPNER heim UNI-Mechanik 2000 Mode D'emploi

UNI-Mechanics 2000

7. Main rotor blades

The UNI-Mechanics 2000 system is designed to be used with high-quality GRP or CFRP main
rotor blades, e.g. Order No. 1266. Naturally it is also possible to install simple wooden rotor
blades, such as Order No. 74A, but in this case the blades are supplied in kit form, and must be
completed following the instructions supplied with them.
Epoxy the blade sleeves supplied with the rotor blades in the holes in the rotor blades, if your
blades are not supplied with the sockets already installed.
When the epoxy has set hard sand the whole blade overall using fine glasspaper, Order No.
700.1 or 700.2.
The weight of the two rotor blades must be the same, as must be the CG (balance point) of both
blades. The method of checking this is shown in the drawing below. First balance the blades
over a triangular pivot, and mark the line of balance twice as shown; the crossing point of the
lines is the CG. Apply several coats of GLATTFIX sanding sealer, Order No. 207, at both ends
of the blade and sand smooth after each coat. Now correct the CG position if necessary (1.) and
carefully equalise the weight of the two blades (2.). Apply colour paint to the doubler region at
the root (approx. 70 mm wide) and at the tip (approx. 20 mm wide), using two colours which are
easily differentiated. This makes it much easier to check blade tracking later. Apply the film
covering as shown in the drawing; first the top surface, then the trailing edge wrap-around, then
the underside. Leave about 12 mm of blade uncovered at each tip (same width on each blade!).
It is important that the covering should be completely smooth and devoid of wrinkles.

7.1 Balancing the rotor blades

Screw the main rotor blades together as shown and hang them up by a length of thread. Apply
adhesive tape to the tip of the lighter blade.
Take your time over the balancing procedure, as properly balanced rotor blades are a basic
necessity if the main rotor is to run smoothly, and not vibrate.

8. Installing the mechanics in the fuselage

You can install the mechanics in one of the many separately available fuselages, or complete
the model as an open-style trainer. In either case follow the instructions supplied with the
fuselage kit.
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