What are the causes of unwanted (excess) cabin vibration?
An unwanted cabin vibration can be generated by a variety of problems: – Propeller mass imbalance (mass distribution problem) – Propeller aerodynamic imbalance (blades not pitched equally or airfoils not matched) – Abnormal engine vibration (combustion problems or unmatched engine components) – Normal engine vibration transmitted abnormally into the airframe (poor engine to airframe isolation) – Aerodynamic excitation of airframe by prop wash.
