GREAT PLANES AccuPoint Manuale di istruzioni - Pagina 5
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3. Turn on the laser. Hold the laser and rotate the weight block until the laser balances
and points at 0°(or to the manufacturer's specification for your chosen reference line).
To fine tune the reading to 0°, turn the brass wheel until the reading is exact.
4. Your meter is now calibrated to your reference line. From here on, do not touch the
laser assembly or weight block or you may knock it out of calibration. Any readings
you now take will all be relative to your reference line.
5. Move the meter to different parts of your plane and read the scale where the laser
dot comes to rest.
Checking Stabilizer Incidence
Most aircraft manufacturers note the incidence angles on their plan sheet. These
angles are generally relative to the centerline (sometimes referred to as a datum line)
of the fuselage. Unfortunately, most plan sheets do not show this datum line, so you
will have to draw a line using a protractor and a ruler. Reference this line from the sta-
bilizer centerline (chord). The line you draw will be parallel to the datum line and can
be used as a reference point to calibrate the meter.
As you can imagine, this task is very difficult to do accurately. If your stab reads with-
in ±1/2° you shouldn't make a change. It is more important that the stab, wing and
thrust angles are correct relative to each other instead of to the datum line.
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