Balancing Methods

There are two methods of propeller balancing - static balancing and dynamic balancing. Neither method can replace the other because they are used for different purposes.

 

Static Balancing.   A propeller can be statically balanced only by removing it from the aircraft and evaluating the balance on a special fixture. Only appropriately certificated persons or organizations may adjust propeller static balance. Static balance weights are added to or removed from the propeller to correct the measured imbalance, or material from the blades is removed by special grinding techniques.

Dynamic Balancing. Propellers may be dynamically balanced in place on the aircraft. Dynamic balancing of a propeller is done to provide for the lowest level of vibration in its operating range. Although the propeller is the focal point of the balancing procedure, it is the combination of the engine, engine mounting system, and the propeller assembly that combine to provide the level of vibration.

 

When balance weights are added or removed from the propeller assembly, it is to reduce the level of vibration produced by the engine, engine mounting system, and the propeller as an operating assembly.

 

When a propeller that has been balanced as part of a particular engine and engine mount system is removed from that assembly, it cannot be assumed that the dynamic balance would remain the same for another engine or engine mounting system.

Text Box: Victory’s Dynamic Propeller Balancing

Kregg Victory  408-836-5122                 email:  kregg@balancemyprop.com

The Dynamic Balancing Method

Professional Dynamic Balancing  use sensors to provide data to a digital processor during brief engine runs at 2000-2400rpm. Corrective weights measured to the 1/10th gram are temporarily placed under spinner screws or starter ring gear which are measured to ± one degree. After prop vibration is reduced to near zero, the spinner is removed so weights can be permanently installed in accordance with F.A.A. approved specifications. 

The entire procedure takes approximately 2.0 hours /engine.