Top Flite TOPQ5700 - Manual (Page 4)

is to hold the item to be balanced
perpendicular and concentric to the
center line of the balancing shaft. Always
position the item to be balanced near
the midpoint of the balancing shaft for
best results. Determine which are the
heavy and light blades of the propeller.
BALANCING
Below are several commonly accepted
methods for balancing.
Method 1: Lightly sand the back side of
the heavier blade with fine sandpaper.
Recheck often to avoid removing too
much material.
Method 2: Apply a drop of medium CA to
the back side of the light blade and use a
piece of waxed paper or a plastic bag
over your finger to smooth the CA into a
thin film. Cure the CA with a light spray of
accelerator. Re-check the balance. Apply
more CA in thin layers until the propeller
is balanced. NOTE: Before adding glue
to a prop, make sure it is absolutely clean
and free of any oil residue.
Method 3: Balance by sanding material
from the very end of the heavy blade.
This will avoid changing the airfoil shape
and avoid the possibility of weakening
the blade. NOTE: Do not attempt to
remove material by carving with a knife,
as this can leave cuts where cracks can
begin to form.
A prop is truly balanced if it can be
stopped and will remain stationary in
any position. If the prop comes to rest in
a level position, but is still obviously out
of balance (hole slightly off-center), you
may need to add weight to the lighter
side of the hub (see method 2). Do not
remove material from the hub. This
could weaken the prop, making it unsafe.
CAUTION: Never remove material
in a way that will cause weak spots
or structural failure in the propeller.
How to balance HEAVY OBJECTS:
The capacity of the balancer can be
significantly increased by loosening the
thumb screw of one magnet. This will
allow both magnets to remain in contact
with the shaft. Allow one magnet to
“float” by leaving the thumb screw
loose. The friction between the shaft
and the magnets increases in this
mode, but balancing accuracy will not
be significantly affected with heavy
objects. Also, keep in mind that large
propellers do not have to make a full
revolution to enable balancing.
How to balance THIN OBJECTS (such
as spinner backplates), or a propeller
with a LARGE HOLE: For this
application, the tapered ends of the
cones would probably touch each other
before centering the object on the shaft,
so you’ll have to turn one of the cones
around (both cones facing the same
direction). This configuration does not