Honeywell Vibrex 2000 User Manual page 162

Chapter 5 – General Operation
In the current example, the operator is balancing a tail rotor with
the Vibrex unit. The installation uses a Velocimeter in the
standard location, as called for in the paper polar chart, and a
convenient location for the photocell at the 11:00 position. The
resulting reading from the Vibrex unit was 0.7 IPS in the 10:20
direction.
To derive a solution from the chart, place the protractor on the
chart so the photocell on the protractor aligns with the angle of
the target when the beam leaves the reflective tape. In other
words, the photocell may be mounted at 11:00 o'clock azimuth,
but the beam actually hits the retro target when it leaves at 12:00.
Then the clock corrector will be placed at12:00 o'clock on the
chart. In the example, the photocell is located at 11:00 and the
target is also triggered at 11:00 o'clock. In that case the
protractor would be placed on the chart so the photocell is at
11:00. See the following illustrations.
For more information on tail rotor balancing with the Vibrex
2000 or Vibrex 2000 Plus, see Section 5.5.4 "Tail Rotor
Balance".
Honeywell Confidential: Use or disclosure of information on this page is subject to the restrictions on the title page.
13841 Rev A
146