67 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 (or measure the
distance from ground to the rotor blades). Then when you switch to adjustment position,
the rotorblades will move up or down a few centimetres. The distance travelled 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 in order to get 6.0
degrees of blade pitch.
Enter blade length in millimeters
<input type=”number” id=”mw-bllength” value=”0” min=”0” max=”1000”
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