Adjustments During The First Flight, Blade Tracking - GRAUPNER Micro Star 400 Manual

4. Adjustments during the first flight
Blade tracking
The term "blade tracking" refers to the height of the two rotor blades when they are spinning.
The adjustment procedure aims at fine-tuning the pitch of the main rotor blades to exactly the
same value, so that the blades rotate at the same level.
Incorrectly set blade tracking, with the blades revolving at different heights, will cause
the helicopter to develop serious vibration in flight.
When you are adjusting the blade tracking, please keep at least 5 metres away from the
model in the interests of safety.
You can only check blade tracking if you are able to see clearly which blade is higher and which
is lower. The best method is to mark the blades with coloured tape as follows:
There are two alternative methods: figure "A" shows the use of different colours on the blade
tips; fig. "B" shows the use of the same colour, but applied at different distances from the tip.
Procedure for adjusting blade tracking:
1. Set the helicopter to the point where it is almost lifting off, then sight directly along the rotor
plane.
2. If you can see that the rotor blades are running in the same plane, no adjustment is required;
however, if one blade is running higher than the other, the settings must be corrected.
3. Locate the pushrods between the blade holders and the mixer levers; the adjustment is
made at the ball-links on both ends of these pushrods: unscrew the links to raise the blade,
screw them in to lower it.
14
Micro Star 400 v2