minimises the variation in the current point's position. When you adjust the
throttle it will take a few seconds for the point to settle down enough to allow
you to capture a reading.
Important
Once you have determined the best RPM to use, it is important to
use the same RPM for each balancing run so that you get consistent
results.
With a steady RPM being reported by the balancer, press the Capture button
to capture a polar point. The point's data will be entered into the list of polar
points for the current job.
Capture a few points – if the propeller is obviously out of balance, the points
will be clustered together some distance away from the centre of the chart.
Now stop the engine and double-check that the ignition is switched off.
If the vibration level is already 0.15 IPS or less, the propeller can be considered
reasonably well balanced – in ideal conditions, the balancer is capable of
balancing a propeller down to about 0.03 IPS so you may wish to continue
the process to achieve a better result. If you want to improve the balance, you
must carry out the balancing procedure as described in the next section.
Tip
To reduce battery drain in the PB-4 and the tablet, it is best to
disconnect the user interface from the PB-4 when you are not
actually capturing points or viewing the live data. When you are
ready to capture a new point, just reconnect.
7.6. Balancing procedure
Important
It is the operator's responsibility to ensure that any procedures or
guidelines that have been issued by the manufacturers of the
propeller, engine or aircraft or some other agency (e.g. the
FAA/CAA/LAA/BMAA), that specify how the propeller is to be
balanced, are adhered to.
The following instructions describe the balancing process from the
point of view of operating the balancer and determining where
balance weights are to be attached. The exact detail of how balance
weights are attached to the hub or spinner backplate is beyond the
scope of this document. If you have any doubt, please consult your
inspector/engineer.
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46
Balancing procedure
Summary of Contents for PB-4
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