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Dynamic Balancing
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Dynamic Balancing is often used to mask propeller problems
It is critical that any rotating object, such as a propeller or the tire on a car be balanced.
If not properly balanced the resulting vibration could cause serious damage to the drive train or the vehicle/vessel.
Dynamic Propeller Balancing is done on a single plane. In the process
weight is removed from the heavier blade(s) until the propeller is
dynamically balanced. This process compensates for any weight problems
associated with the boss (hub) and any loading problems associated
with mismatched pitches between blades. Mismatched propeller blade
pitch creates a situation where the propeller blades are unevenly
loaded by air pressure as the propeller is spun.
The dynamic balancer
senses this mismatched loading as an out of balance situation. This
is then compensated for by the operator by removing weight from the
blades until the Dynamic Balancer is “fooled” into thinking
the propeller is balanced.
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Dynamic Balancing
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In the water the load on the propeller blades is proportional to
the load created by air on the dynamic balancer out of the water.
In other words a propeller that is dynamically balanced will probably
run smoothly in the water. If there is a pitch problem dynamically
balancing a propeller will mask that problem.
A Pitch Imbalance problem will compromise the efficiency of a propeller
which in turn compromises the efficiency of the vessel
To properly dynamic balance a propeller it is imperative that the
static balance also be checked after dynamic balancing. If after
dynamic balancing the static balance is out it is an indication that
there are existing pitch balance problems. A propeller that is correctly
pitch balanced and then correctly static balanced will be dynamically
balanced.
On a correctly repaired and static balanced propeller that
is ISO Class 1 or better dynamic balancing is redundant.
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