Charles M. Seibel, Chief Helicopter Engineer for Cessna Aircraft Company Military Division will discuss the problems of achieving stability in a helicopter in an address before members of the American Helicopter Society in St. Louis, February 18 . In his discussion, Seibel will relate the problems encountered during an intensive research and development program at Cessna. The program was initiated to achieve stability in a helicopter comparable to a fixed wing aircraft. The CH-lC helicopter, newest FAA certificated aircraft at Cessna, embodies the stability achievements resulting from the program. The helicopter is capable of instrument weather flying without relying on electronic components for the required stability. Seibel, a former president of the AHS , is a graduate of the California Institute of Technology where he received his masters degree in Aeronautical Engineering .