Prop Balancing and Mounting Tips

Balancing Propellers
A significant amount of effort is put into making sure that all APC propellers are as
close to being perfectly balanced as possible before they are shipped. Therefore, it is
unlikely that a balance correction will be required. The following procedure should be
used to check the balance of a propeller.
The drilled hole should not be used for checking balance since it is sometimes not as
straight as it should be. Instead the user should check the balance of all APC
propellers using the precision molded hole at the back side of the hub (see illustration
below). The tapered part of the balance cone should be used on this side. A pin that is
smaller than the through hole should be used to prevent any interference with the
drilled hole. Finally, a washer (or the flat end of the balance cone) should be used to
secure the propeller at the forward face of the hub. Similarly to the way it mounts to
the motor.
If your propeller requires a balance correction, it is recommended that material be
removed from the upper and lower surfaces at the tip of the heavy blade.