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Chapter 5 – General Operation
1. Rotate the retro-reflective target on the propeller or spinner
so it is aligned with the beam of the photocell.
WARNING: Use caution when working around the
propeller. Treat the propeller as though the engine could
fire, and work around the propeller only if the user is
certain the engine cannot fire.
2. Using the Propeller Protractor side with the same direction
of rotation as the propeller, hold the Propeller Protractor
against the center of the propeller or propeller spinner. Make
sure the Velocimeter on the protractor is parallel and in the
same orientation as the Velocimeter mounted on the engine.
3. Locate the clock angle from the Vibrex unit solution on the
propeller.
4. Place the weight from the solution at the location derived
from using the Propeller Protractor.
5. If the user places weight at a location other than that
specified by the Vibrex unit, make a note of the clock angle
of the weight and change the appropriate WEIGHT
ENTERED solution in the Vibrex unit. Use the Solution
screen for this purpose. For information on this screen, see
Section 5.4.3 "Obtaining Balance Solutions".
For example, the user has mounted the Velocimeter on the right
side of the case but oriented it so the arrow on its body is
pointing up. Then, the user must align the Propeller Protractor so
its Velocimeter is also pointing up (12:00 direction). The arrow
on the Velocimeter must be parallel and pointing in the same
direction as the arrow on the Velocimeter located on the
Propeller Protractor.
Helpful Hint -
photocell beam and the retro-reflective target, place the beam of
the photocell at the line of the target as it exits the photocell
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To be exactly accurate on the alignment of the
13841 Rev A
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