Viper 4040 User Manual
4 Propeller Balance – 4-9
4.1.1.4.2. Use the [⇓] key to move to the “No. of Holes” field. Enter the number of holes
that correspond to the total number of trim weight mounting locations. The valid
range of values for this field is 1 to 36.
4.1.1.4.3. Move to the “Space” field using the [⇓] key and then use the [⇒] key to select
“Even” or “Uneven” from the available selections. Even indicates that all trim
weight mounting locations are evenly spaced. The analyzer will automatically
calculate the number of degrees between holes in this case. If you select
“Uneven,” and then use the [⇓] key to move away from the field, several fields
(“Ang” and “No.”) appear at the bottom of the screen. You will complete these
fields later in the process at step 4.1.1.4.6.
4.1.1.4.4. Use the [⇓] key to move to the next field, “Dir (FLA).” Complete this field by
using the [⇒] key, select CW for clockwise or CCW for counter-clockwise to
indicate the direction of increasing hole numbers as viewed from forward looking
aft.
4.1.1.4.5. Move to the “Max H. Wt” field using the [⇓] key. Using the keypad, enter the
maximum allowable weight (in grams) for any single hole. Use the [⇓] key to
move to the next field.
4.1.1.4.6. Complete the next fields differently depending on data you input in step 4.1.1.4.3
above.
If you selected “Even” in step 4.1.1.4.3 - The “Enter the Angle of No. 1 Hole”
field is displayed. Use the keypad to enter the angle of hole number 1 as viewed
from the front of the engine looking aft. To determine this angle, do the
following. With mag switches OFF, rotate the propeller to align the tachometer
pickup and its triggering device (magnetic interrupter, reflective tape, etc.). With
the propeller in this position, use the 12:00 position as the “0” or “360 degrees”
(index point) and measure opposite the direction of rotation to the angle of hole
number 1. For example, if the #1 hole is at the 3:00 position (simply as viewed on
the face of a clock from in front of the engine, disregarding propeller direction of
rotation) and the engine rotates counterclockwise, the angle would be 90 degrees.
If the #1 hole is at the 3:00 position and the engine rotates clockwise it would be
270 degrees. The measurement to hole # 1 must always be measured opposite the
direction of rotation.
If you selected “Uneven” in step 4.1.1.4.3 – Multiple angle/hole number fields are
displayed. Each hole angle must be defined individually. Using the keypad,
complete each field by entering a hole number (“No.”) and its corresponding
angular (“Ang”) location as measured opposite the direction of propeller rotation.
Use the [⇓] and [⇑] keys to move between these fields. To determine these
values, do the following. With mag switches OFF, rotate the propeller to align the
tachometer pickup and its triggering device (magnetic interrupter, reflective tape,
etc.). With the propeller in this position, use the 12:00 position as the “0” or “360
degrees” (index point) and measure opposite the direction of rotation to the angle
of each hole number and record that angle adjacent to the hole number. (See the
example “Prop Hole Layout Setup” screen shown at the beginning of the section.)
For example, if the number 1 hole is near the 6:00 position, the angle may be
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