Company History






The Problem

The Solution





AOPA Article

A Balancing Tour


Vibration Analysis



















Over 30 years ago we began spin balancing our car tires which we quickly found was a vast improvement over static "bubble balancing".

Propellers are statically balanced during overhaul and this is a good start, however, test-stand balancing does not compensate for the unbalance caused by the prop spinner, spinner bulkheads, starter ring gear and aerodynamic loading. Also, since residual prop and/or crank geometrical manufacturing errors are normally always present, these slight errors introduce another chance for unbalance. For example, if the center of the prop mass is only one-thousand of an inch out of alignment with the centerline of the crankshaft the result is a 0.3 IPS imbalance which amounts to a ~40 lb oscillating side-load at the front engine bearing. Although the bearing oil pressure will prevent metal on metal interference up to 1.2 ips, the vibration energy is still transmitted throughout the engine and airframe.

All unbalance vibration amounts to wasted energy. Well, not truly wasted since this energy will eventually work to cause fatigue, cracks and component failures as well as premature avionics and instrument failures. The repairs are usually costly and since the band aid approach is temporary, vibration continues to take its toll.

Vibration also exacerbates pilot fatigue and can cause passenger discomfort and safety concerns.

   is Bad for Engines, Airframes, Avionics and Pilots!