Propeller Balancing
Vibrex 2000 and Vibrex 2000 Plus User Guide 83
NOTE: The blue side of the Propeller Protractor is for counter-
clockwise rotation, and the red side is for clockwise.
Correct Location -
To find the correct location on the propeller for
applying the balance weights, use the Propeller Protractor, as follows:
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.
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.
2. Locate the clock angle from the Vibrex unit solution on the propeller.
3. Place the weight from the solution at the location derived from using
the Propeller Protractor.
4. 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” on page 81.
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 -
To be exactly accurate on the alignment of the photocell
beam and the retro-reflective target, place the beam of the photocell at the
line of the target as it exits the photocell beam. During placement of the
target on installation, it is easy to turn the propeller so the pulsating
reflecting light just goes out after passing the beam of the photocell.
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