Gen II User Manual
4-10 – Propeller Balance Chapter 4 Revision 2.2, Apr 2020
4.1.1.1.4. Using the [] key, move to the “Max Wts” field. Enter the maximum total trim
balance weight (in grams) allowed for this installation. If the manufacturer does
not specify a maximum weight, refer to the ACES Systems Guide to Propeller
Balancing. The valid range of values for this field is 1 to 9999.
4.1.1.1.5. Move to the “Balance RPM” field using the [] key. Using the keypad, enter the
actual propeller RPM at which you intend to balance. If no manufacturer
recommendation is available, refer to the ACES Systems Guide to Propeller
Balancing included with the Propeller Balance option. A low-cruise RPM is
usually best. The valid range of values for this field is 50 to 10,000 for the Cobra
II and 50 to 32767 for the Viper II.
4.1.1.1.6. Using the [] key, move to the “Relative to” field. Select “Tape” or “Sensor”
using the [] key. Decide if you wish to measure weight placement phase angles
relative to the reflective tape or the vibration sensor as an index point. If using
predetermined weight locations, described in paragraphs 4.1.1.1.77 and 4.1.1.4
below, select “Tape.”
4.1.1.1.7. Move to the “Holes:” field and select either “Yes” or “No” using the [] key.
Yes, indicates that the propeller assembly has predetermined locations, or holes
where trim balance weights can be added. If you select “Yes,” a page for defining
the angle of each hole will be provided. The “No” answer indicates that no
predetermined locations are available and that you will be drilling holes for the
permanent mounting of the final trim balance weights.
4.1.1.1.8. When “2” Engs are selected in step 4.1.1.1.3 AND “Yes” is selected in step
4.1.1.1.7, the “Engines Use Same Hole Layout:” field will appear. Use the []
key to select “Yes” or “No”. Selecting “Yes” will indicate that both engines have
the same predetermined locations, or holes with the same angles. See step 4.1.1.4
for detailed instructions on defining these settings.
4.1.1.1.9. Move to the “Vib:” field and use the [] key to choose the vibration engineering
units for this balance job. The choices are IPS (inches per second velocity),
mm/sec (millimeters per second velocity), cm/sec (centimeters per second
velocity), mils (1000ths of an inch displacement), microns (1000ths of a
millimeter displacement), m/s/s (meters per second per second), and cm/s/s
(centimeters per second per second). Unless otherwise directed by the propeller
or aircraft manual, select IPS.
4.1.1.1.10. The field to the immediate right of the “Vib:” field is unmarked. It is also a
selection field and contains the modifiers to be used with the units of vibration
(Vib:). The selections are Peak (Peak may also be called single amplitude), Pk-Pk
(Peak-to-Peak may also be called double amplitude), Avg. (Average), and RMS
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