Setting Up - GRAUPNER heim Bell 230 Instructions D'utilisation

2. Setting up

The following sections are included in this or similar form in the assembly manuals supplied with
the mechanics, but they are repeated here in case you are using an early version of
Graupner/Heim Uni-Expert mechanics, which was supplied with the original plans.
2.1 Setting up the cyclic control system
The basic settings for the roll-axis and pitch-axis control systems should already be correct if
you have installed the linkages exactly as described in the instructions. Since the instructions
include the lever lengths (correct linkage holes), the final setting up is carried out using the
electronic facilities on your transmitter. Note that the servo travel should not be set too high, and
ensure that the swashplate does not strike its end-stops on the main rotor shaft at either end-
point of the transmitter stick travel for roll-axis and pitch-axis movements, as this would mean
that collective pitch control would not be linear, i.e. axial movements would be restricted.
2.2 Main rotor pitch settings
The main rotor pitch is measured using a pitch gauge (optional accessory, not included in the
kit). The following table shows the recommended basic settings, but the optimum values may
well vary from model to model according to the rotor blades you are using.
Hovering and practice
Aerobatics
Auto-rotation
The best way of setting the correct blade pitch on the transmitter is as follows:
1. Measure the hovering pitch and set it to the correct value.
2. Measure collective pitch maximum and minimum and adjust the values according to the
following diagrams using your transmitter's collective pitch curve facility.
2.3 Setting up the carburettor control system
The following diagrams show two alternative carburettor control curves:
• The hover-optimised throttle curve produces gentle control response in the hover region.
• The values stated above can only be a guideline as they vary greatly according to the motor,
fuel, silencer etc. in use. There is no alternative but to fine-tune them during the test-flying
programme.
Minimum Hover
-2° 5,5°...6°
-4° 5°... 5,5°
-4°
23
Bell 230
Maximum
12°
8°... 9°
5,5° 13°