72 Measuring pitch without pitch gauge
If your helicopter is too small for attaching a digital pitch gauge or simply in case you
haven't got one you can use a little trick to measure the pitch anyway. You can calculate
the angle from the distance the rotor blades move from zero position. Actually this is not
as accurate as measuring the pitch with a digital pitch gauge, but it's better than nothing.
All you need for this is a ruler and and a good eye. First you need to know the length of
the rotorblades from the bolt hole to the outer edge. Usually this matches the specified
rotor blade length of the manufacturer. Then you align the rotorhead with the longitudinal
axis of the helicopter and fold both rotorblades to one side (as this will put heavy load on
the servos it is not recommended use this method on large helicopters with heavy blades!).
Now hold your ruler to the blades and mark the zero position. Then when you add positive
or negative pitch you can measure the distance between the outer edge of one blade to the
other. This distance can be transfered into degrees of blade pitch using the mathematical
formula of sinus. Or the other way round you can calculate how far you rotorblades must
move away from each other in order to get a specific blade pitch.
Enter blade length in millimeters
<input type=”number” id=”mw-bllength-pitch” value=”0” min=”0” max=”1000”
Enter blade pitch in degrees
<input type=”number” id=”mw-degrees-pitch” value=”11” min=”0” max=”90”
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