Chapter 5 – General Operation
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The phase angle derived by the Vibrex unit is a combination
of the direction of sensitivity of the Velocimeter, the azimuth
from the photocell system, and the phase correction.
The farther the Velocimeter is from the rotating item, the
greater the likelihood becomes that a phase correction is
necessary.
NOTE: Phase correction increases with any greater
freedom of movement the structure has. If a structure is
solid, the phase correction is minimal, but if a structure
has freedom of movement (like sheet metal structures) the
phase correction can be quite large, even though the
distances involved are small.
Making Allowance - To allow for these sensitivities and phase
correction, use measurements derived from previous balance
operations with the same type of aircraft and the same
installation. Use this method, as follows:
1. At the Set Sensitivity screen, enter the weight sensitivity and
phase correction from the record that resulted in the best
improvement in balance.
2. With the sensitivity set, advance to the next screen by
pressing the START key. The Vibrex unit screen displays the
new sensitivity under its set sensitivity notation.
3. To begin engine runs, press START.
5.4.1.5
Saving Corrected Propeller
Configurations (EV2K+ only)
The user may want to save the auto-corrected or user edited
sensitivities and clock angle corrections. This would especially be true
if they vary by a large amount from the factory supplied horsepower
settings or if the user has a specific prop or aircraft model “dialed in”
and wants to save those settings.
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